7. Operation: External User I/O

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Fig. 7.1 SL Series MagnaDC power supply D-Sub JS1 37-pin external user I/O connector (female) pin numbering

Table 7.1 Complete pin listing and definitions available on the JS1 37-pin external user I/O port
User I/O Pin Definition Signal Type Description
1 REF GND Reference Ground Ground to be used as analog voltage input-output reference
2 REF GND Reference Ground Ground to be used as analog voltage input-output reference
20 REF GND Reference Ground Ground to be used as analog current input-output reference
7 GND Ground Ground to be used as digital input-output reference
6 +2.5V REF CAL Reference Voltage 2.5 V reference voltage used for calibration purposes
21 +10V REF Reference Voltage 10.0 V reference supply, relative to the REF GND pins. Reference capable of supplying a maximum of 25 mA.
26 +5V REF Reference Voltage 5.0 V reference supply, relative to the REF GND pins. Reference capable of supplying a maximum of 25 mA.
3 VREF EXT Analog Input External voltage set point reference, 0-10 Vdc, proportional to the power supply output voltage. 0 Vdc on VREF EXT is equivalent to 0 Vdc output voltage, and 10 Vdc is equivalent to 100% full scale output voltage.
4 TVREF EXT Analog Input External over voltage trip set point reference, 0-10 Vdc, proportional to the power supply output voltage. 0 Vdc on TVREF EXT is equivalent to 0 Vdc trip reference, and 10 Vdc is equivalent to 110% full scale voltage over voltage trip.
22 IREF EXT Analog Input External current set point reference, 0-10 Vdc, proportional to the power supply output current. 0 Vdc on IREF EXT is equivalent to 0 Adc output current, and 10 Vdc is equivalent to 100% full scale output current.
23 TIREF EXT Analog Input External over current trip set point reference, 0-10 Vdc, proportional to the power supply output current. 0 Vdc on TIREF EXT is equivalent to 0 Adc trip reference, and 10 Vdc is equivalent to 110% full scale current over voltage trip.
25 VMOD Analog Input Modulation voltage input for non-linear profile emulation or voltage/current addition, subtraction, or multiplication factors.
5 VO2 Analog Output Output voltage reference, 0-10 Vdc, proportional to the power supply’s real-time output voltage. 0 Vdc on VO2 is equivalent to 0 Vdc output voltage and 10 Vdc is equivalent to 100% full scale output voltage.
24 IO2 Analog Output Output current reference, 0-10 Vdc, proportional to the power supply’s real-time output current. 0 Vdc on IO2 is equivalent to 0 Vdc output current and 10 Vdc is equivalent to 100% full scale output current.
17 START Digital Input Enables the power supply output. The input contactors are engaged and the power supply will ramp up to the programmed set points.
18 CLEAR Digital Input Clears a fault condition, returning the power supply to standby.
19 STOP Digital Input Disables the power supply output. The input contactors are disengaged and the power supply will ramp down to zero voltage and current.
36 ARM Digital Input Activates autosequencing through memory states. Function only available on the D Version front panel for TS Series, MS Series, and MT Series products.
37 INTERLOCK SET Digital Input 5 Vdc input for interlock signal. If the power supply output is enabled, and the +5 Vdc signal is removed, the power supply will enter into LOC fault condition, and the AC contactors will disengage. The fault will need to be cleared before re-enabling the output. Interlock must be enabled to use this functionality.
8 POWER Digital Output Indication that the power supply output is enabled.
9 THERMAL Digital Output Indication that the input power processing devices or output rectifiers have reached a critical temperature. A resetting thermal switch will reset upon cooling.
10 INTERLOCK Digital Output Indication that the power supply reached a interlock fault condition. This pin will stay active until 5.0 V is restored to INTERLOCK SET (Pin 37) and the fault is cleared. To restart the supply after the fault has been cleared, simply press the start switch.
11 CUR CTL Digital Output Indication that the power supply is operating in current-mode control.
12 STANDBY/ALM Digital Output Indication that the power supply is in standby or alarm condition. In both states, the output is disengaged.
13 ALM Digital Output Indication that the power supply is in alarm condition resulting from a fault. The alarm will need to be cleared before re-enabling the output.
14 EXT CTL Digital Output Indication that external start, stop, and clear is activated for use.
15 FUSE Digital Output Indication that the fuse alarm is activated. In units where circuit breakers are present, in place of fuses, an open circuit breaker connection will trigger the fuse alarm. Fuse alarm is only applicable in TS Series, MS Series, and MT Series power supplies.
27 PGM LINE Digital Output Indication that an analog input signal is beyond the range of control (greater than 12.50 V). These lines are constantly monitored and if any of these references are set above the normal bounds, program line diagnostics will disable the supply.
28 STANDBY Digital Output Indication that the control circuits are powered, but the supply is disabled through the AC contactor. This is the power supply’s normal off condition. To start the supply, press the start switch. To place the supply in standby, press the stop switch.
29 PHASE LOSS Digital Output Indication that there’s a problem with the power mains voltage. Phase loss alarm is only applicable in XR Series, TS Series, MS Series, and MT Series power supplies.
30 VOLT CTL Digital Output Indication that the power supply is operating in voltage-mode control.
32 OCT Digital Output Indication that the supply has exceeded the over current trip reference. This condition causes the supply to shutdown into a fault state. To clear this condition, the user must press the clear button on the front panel with internal control enabled or by applying 5.0 V to CLEAR (Pin 18) of JS1 with external control enabled. To restart the supply after the fault has been cleared, simply press the start switch. A secondary over current trip diagnostic provides protection of internal circuitry due to abnormal line and load conditions or due to failed internal circuitry. This over current trip condition requires the control power to be recycled by toggling the power switch off and on.
33 INT CTL Digital Output Indication that front panel start, stop, and clear is activated for use.
34 OVT Digital Output Indication that the supply has exceeded the over voltage trip reference. This condition causes the supply to shutdown into a fault state. To clear this condition, the user must press the clear button on the front panel with internal control enabled or by applying 5.0 V to CLEAR (Pin 18) of JS1 with external control enabled. To restart the supply after the fault has been cleared, simply press the start switch.

7.1. Analog Inputs

Table 7.2 Analog inputs available on the JS1 37-pin external user I/O connector
User I/O Pin Definition Description
3 VREF EXT External voltage set point reference, 0-10 Vdc, proportional to the power supply output voltage. 0 Vdc on VREF EXT is equivalent to 0 Vdc output voltage, and 10 Vdc is equivalent to 100% full scale output voltage.
4 TVREF EXT External over voltage trip set point reference, 0-10 Vdc, proportional to the power supply output voltage. 0 Vdc on TVREF EXT is equivalent to 0 Vdc trip reference, and 10 Vdc is equivalent to 110% full scale voltage over voltage trip.
22 IREF EXT External current set point reference, 0-10 Vdc, proportional to the power supply output current. 0 Vdc on IREF EXT is equivalent to 0 Adc output current, and 10 Vdc is equivalent to 100% full scale output current.
23 TIREF EXT External over current trip set point reference, 0-10 Vdc, proportional to the power supply output current. 0 Vdc on TIREF EXT is equivalent to 0 Adc trip reference, and 10 Vdc is equivalent to 110% full scale current over voltage trip.
25 VMOD Modulation voltage input for non-linear profile emulation or voltage/current addition, subtraction, or multiplication factors.

The SL Series MagnaDC power supply has 5 analog inputs, as detailed in Table 7.2. These analog inputs can accept 0-10 V input signals and have a 10 kΩ input impedance.

To use the analog inputs, the SL Series MagnaDC power supply must be configured for External Program (EXT PGM). When properly enabled, the EXT PGM LED on the front panel will be illuminated. EXT PGM status can also be queried by computer command. For more information on enabling EXT PGM:

Once enabled, all voltage and current programming along with trip reference programming must be done by the JS1 external user I/O connector. Ensure that VREF EXT (Pin 3), TVREF EXT (Pin 4), IREF EXT (Pin 22), and TIREF EXT (Pin 23) are all connected to a programming signal. In most applications, three of the four analog input references are jumpered to the +10V REF (Pin 21) with the user supplied external reference signal used for the remaining signal.

For the best possibility fidelity for analog programming, use the reference ground REF GND (Pin 1 or Pin 2) as the reference for voltage programming inputs VREF EXT (Pin 3) and TVREF EXT (Pin 4). Likewise, use REF GND (Pin 20) as the reference for current programming inputs IREF EXT (Pin 22) and TIREF EXT (Pin 23).

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Fig. 7.2 External (a) resistive, (b) voltage, and (c) current programming

7.1.1. External Voltage Source Programming

For programming using a voltage source, an external 10.0 V voltage source is placed between VREF EXT (Pin 3) and REF GND (Pin 1) of JS1 to control the output voltage.

The current set point, over voltage trip, and over current trip can be programmed in the same manner. Referring to the Analog Inputs pin identification, use IREF EXT (Pin 22) to program the current set point, TVREF EXT (Pin 4) to program over voltage trip, and TIREF EXT (Pin 23) to program over current trip. The power supply has been calibrated to produce full scale output voltage and current with 10.0 V inputs at the external reference input terminals. Furthermore, over voltage and over current trip have been calibrated to trip at 110% full scale output voltage and current with 10.0 V inputs at the external reference input terminals. Most commonly, IREF EXT (Pin 22), TVREF EXT (Pin 4), and TIREF EXT (Pin 23) are all jumpered together and tied to +10V REF (Pin 21).

7.1.2. External Current Source Programming

To produce an external analog voltage reference to VREF EXT (Pin 3), a current source is applied to a shunt resistor. Using a 2 mA current source, place a 10.0 kΩ precision metal film resistor between VREF EXT (Pin 3) and REF GND (Pin 1). The input impedance between terminals 1 and 3 is 10.0 K and paralleling the additional resistor produces an equivalent resistance of 5 K. The 2 mA current source will produce 10.0 V at the external voltage reference input which will produce full scale output voltage.

The current set point, over voltage trip, and over current trip can be programmed in the same manner. Referring to the Analog Inputs pin identification, use IREF EXT (Pin 22) to program the current set point, TVREF EXT (Pin 4) to program over voltage trip, and TIREF EXT (Pin 23) to program over current trip. The power supply has been calibrated to produce full scale output voltage and current with 10.0 V inputs at the external reference input terminals. Furthermore, over voltage and over current trip have been calibrated to trip at 110% full scale output voltage and current with 10.0 V inputs at the external reference input terminals. Most commonly, IREF EXT (Pin 22), TVREF EXT (Pin 4), and TIREF EXT (Pin 23) are all jumpered together and tied to +10V REF (Pin 21).

7.1.3. External Resistive Source Programming

Resistive programming requires connection of an external potentiometer or resistors between +10V REF (Pin 21), VREF EXT (Pin 3), and REF GND (Pin 1) of the JS1 connector. +10V REF (Pin 21) is a 10.0 V precision reference, REF GND (Pin 1) is the reference ground, and VREF EXT (Pin 3) is the voltage set point input. Like front panel rotary control, the precision reference produces a voltage across the potentiometer or resistors which is then used to produce the voltage set point. Metal film resistors or a wire wound potentiometer will result in the lowest temperature coefficient.

The current set point, over voltage trip, and over current trip can be programmed in the same manner. Referring to the Analog Inputs pin identification, use IREF EXT (Pin 22) to program the current set point, TVREF EXT (Pin 4) to program over voltage trip, and TIREF EXT (Pin 23) to program over current trip. The power supply has been calibrated to produce full scale output voltage and current with 10.0 V inputs at the external reference input terminals. Furthermore, over voltage and over current trip have been calibrated to trip at 110% full scale output voltage and current with 10.0 V inputs at the external reference input terminals. Most commonly, IREF EXT (Pin 22), TVREF EXT (Pin 4), and TIREF EXT (Pin 23) are all jumpered together and tied to +10V REF (Pin 21).

7.2. Analog Outputs

Table 7.3 Analog outputs available on the JS1 37-pin external user I/O port
User I/O Pin Definition Description
5 VO2 Output voltage reference, 0-10 Vdc, proportional to the power supply’s real-time output voltage. 0 Vdc on VO2 is equivalent to 0 Vdc output voltage and 10 Vdc is equivalent to 100% full scale output voltage.
24 IO2 Output current reference, 0-10 Vdc, proportional to the power supply’s real-time output current. 0 Vdc on IO2 is equivalent to 0 Vdc output current and 10 Vdc is equivalent to 100% full scale output current.

Two analog outputs are provided for monitoring output voltage and current on the JS1 37-pin external user I/O connector. As illustrated in Fig. 7.3, output monitoring voltage, VO2 (Pin 5), can be obtained by monitoring the voltage between terminals VO2 (Pin 5) of JS1 and REF GND (Pin 1, Pin 2, or Pin 20) of JS1. Output monitoring current, IO2 (Pin 24), can be obtained by monitoring the voltage between terminals IO2 (Pin 24) of JS1 and REF GND (Pin 1, Pin 2, or Pin 20) of JS1. Like the programming inputs, full scale output voltage and current will produce 10.0 V. The output impedance of the analog moniotinr terminals is 100 Ω.

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Fig. 7.3 External monitoring output (a) voltage and (b) current

7.3. Digital Inputs

Table 7.4 Digital inputs available on the JS1 37-pin external user I/O port
User I/O Pin Definition Description
17 START Enables the power supply output. The input contactors are engaged and the power supply will ramp up to the programmed set points.
18 CLEAR Clears a fault condition, returning the power supply to standby.
19 STOP Disables the power supply output. The input contactors are disengaged and the power supply will ramp down to zero voltage and current.
36 ARM Activates autosequencing through memory states. Function only available on the D Version front panel for TS Series, MS Series, and MT Series products.
37 INTERLOCK SET 5 Vdc input for interlock signal. If the power supply output is enabled, and the +5 Vdc signal is removed, the power supply will enter into LOC fault condition, and the AC contactors will disengage. The fault will need to be cleared before re-enabling the output. Interlock must be enabled to use this functionality.

All digital input lines are located on the JS1 37-pin external user I/O connector located on the rear panel. As illustrated in Fig. 7.4, the digital input lines are START (Pin 17), STOP (Pin 19), CLEAR (Pin 18), and INTERLOCK SET (Pin 37). Functionally, the digital input control lines emulate the functions on the front panel when external control (EXT CTL) is enabled, indicated by the EXT CTL light on the front panel. Digital control lines may be paralleled with other supplies to allow simultaneous control. For more information on enabling EXT CTL:

All digital input lines are triggered by a external momentary (pulsed) +5V signal. If STOP (Pin 19) is left high, it will take presedence over the START (Pin 17) signal.

A +5V reference (+5V REF) is provided on Pin 26 with respect to ground. This reference voltage can be used in combination with user-supplied dry contacts to trigger the digital inputs.

Interlock set requires a either a physical short between +5V REF (Pin 26) and INTERLOCK SET (Pin 37) of the JS1 37-pin external user I/O connector or application of a +5V source with the positive connection at INTERLOCK SET (Pin 37) of JS1 and the negative connection at GND (Pin 7) of JS1. One of these two connections must be made to enable operation of the power supply. If the interlock connection is broken then the LOC (interlock) fault LED lights, the power supply’s internal AC contactor opens, and the unit stops processing power. For more information on Interlock functionality:

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Fig. 7.4 Digital inputs control lines

7.4. Digital Outputs

Table 7.5 Digital outputs available on the JS1 37-pin external user I/O port
User I/O Pin Definition Description
8 POWER Indication that the power supply output is enabled.
9 THERMAL Indication that the input power processing devices or output rectifiers have reached a critical temperature. A resetting thermal switch will reset upon cooling.
10 INTERLOCK Indication that the power supply reached a interlock fault condition. This pin will stay active until 5.0 V is restored to INTERLOCK SET (Pin 37) and the fault is cleared. To restart the supply after the fault has been cleared, simply press the start switch.
11 CUR CTL Indication that the power supply is operating in current-mode control.
12 STANDBY/ALM Indication that the power supply is in standby or alarm condition. In both states, the output is disengaged.
13 ALM Indication that the power supply is in alarm condition resulting from a fault. The alarm will need to be cleared before re-enabling the output.
14 EXT CTL Indication that external start, stop, and clear is activated for use.
15 FUSE Indication that the fuse alarm is activated. In units where circuit breakers are present, in place of fuses, an open circuit breaker connection will trigger the fuse alarm. Fuse alarm is only applicable in TS Series, MS Series, and MT Series power supplies.
27 PGM LINE Indication that an analog input signal is beyond the range of control (greater than 12.50 V). These lines are constantly monitored and if any of these references are set above the normal bounds, program line diagnostics will disable the supply.
28 STANDBY Indication that the control circuits are powered, but the supply is disabled through the AC contactor. This is the power supply’s normal off condition. To start the supply, press the start switch. To place the supply in standby, press the stop switch.
29 PHASE LOSS Indication that there’s a problem with the power mains voltage. Phase loss alarm is only applicable in XR Series, TS Series, MS Series, and MT Series power supplies.
30 VOLT CTL Indication that the power supply is operating in voltage-mode control.
32 OCT Indication that the supply has exceeded the over current trip reference. This condition causes the supply to shutdown into a fault state. To clear this condition, the user must press the clear button on the front panel with internal control enabled or by applying 5.0 V to CLEAR (Pin 18) of JS1 with external control enabled. To restart the supply after the fault has been cleared, simply press the start switch. A secondary over current trip diagnostic provides protection of internal circuitry due to abnormal line and load conditions or due to failed internal circuitry. This over current trip condition requires the control power to be recycled by toggling the power switch off and on.
33 INT CTL Indication that front panel start, stop, and clear is activated for use.
34 OVT Indication that the supply has exceeded the over voltage trip reference. This condition causes the supply to shutdown into a fault state. To clear this condition, the user must press the clear button on the front panel with internal control enabled or by applying 5.0 V to CLEAR (Pin 18) of JS1 with external control enabled. To restart the supply after the fault has been cleared, simply press the start switch.

All digital output lines are connected to the JS1 37-pin external user I/O connector. Functionally, the digital output lines provide the means to monitor diagnostic functions as functional status. Fig. 7.5 provides terminal identification for the various digital output lines. Each output monitoring line can drive a 5.0 V, 5.0 mA load. An alarm condition will produce a 5.0 V output at the respective terminal.

Table 7.5 provides an explanation of all the available digital output lines.

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Fig. 7.5 Digital outputs control lines

Diagnostic functions include thermal overload, interlock, power, standby, phase loss, program line, over voltage, and over current. All diagnostic indicators have memory retention which saves the fault condition until the power supply is reset. To clear a fault condition, the user must press the clear key on the front panel with internal control or by applying +5V to CLEAR (Pin 18) of JS1 with external control enabled. Alternatively, the supply can be cleared by turning the power supply off and on.

Diagnostic functions and control modes are embedded in the product’s closed loop control. The power supply will operate using voltage control or current control depending on which setting is lowest. Voltage control and current control also contain a soft start functionality which causes voltage and/or current to ramp to the desired set point after power is initiated. The soft start circuitry is reset upon power-on or operation of any diagnostic function.

7.5. Reference Signals and Grounds

Table 7.6 Reference signals and grounds on the JS1 37-pin external user I/O port
User I/O Pin Definition Signal Type Description
1 REF GND Reference Ground Ground to be used as analog voltage input-output reference
2 REF GND Reference Ground Ground to be used as analog voltage input-output reference
20 REF GND Reference Ground Ground to be used as analog current input-output reference
7 GND Ground Ground to be used as digital input-output reference
6 +2.5V REF CAL Reference Voltage +2.5V reference voltage used for calibration purposes
21 +10V REF Reference Voltage 10.0 V reference supply, relative to the REF GND pins. Reference capable of supplying a maximum of 25 mA
26 +5V REF Reference Voltage 5.0 V reference supply, relative to the REF GND pins. Reference capable of supplying a maximum of 25 mA

A variety of reference voltages and grounds are provided on the SL Series MagnaDC power supply JS1 37-pin external user I/O connector. Table 7.6 provides an explanation of all the available digital output lines.

The reference grounds (Pin 1, 2, 20; REF GND) are to be used as the reference point for analog inputs and outputs. These ground pins have a series resistance to ground to provide a clean ground reference by mitigate switching noise that may appear on the ground line. It is recommended to use the reference ground pin closest to the analog input or output being used.

The remaining ground (Pin 7; GND) is available as a ground for digital inputs and outputs.

A +5V reference (+5V REF) is provided on Pin 26 with respect to ground. This reference voltage can be used in combination with user-supplied dry contacts to trigger the digital inputs. The +5V REF is capable of supplying a maximum of 25 mA.

A +10V reference (+10V REF) is provided on Pin 21 with respect to ground. While in external program (EXT PGM) mode, this reference voltage can be used to jumper unused analog inputs to their maximum value, instead of providing a user-supplied analog reference voltage. In addition, the +10V REF can be used in conjunction with a user-provided potentiometer for external control at a remote location. The +10V has a 1 Ω impedance and is capable of supplying a maximum of 25 mA.