External Pin (JS1) and PLC Integration Guide

All Magna-Power Electronics programmable DC power supplies come standard with 37-pin isolated analog and digital control, which maps all monitoring and programming functions. The 37-pin connector, labeled JS1, is located on the rear of the power supply. To use external programming, there are three initial requirements:

  1. Configure the power supply for external programming mode. This programming mode is enabled when EXT PGM is illuminated on the front panel, allowing the power supply to receive voltage and current setpoints from an analog voltage.
  2. Configure the power supply for external control. This control mode is enabled when EXT CTL is illuminated on the front panel, allowing the power supply to receive start and stop commands from an external digital signal.
  3. Ensure that VREF EXT (Pin 3), TVREF EXT (Pin 4), IREF EXT (Pin 22), and TIREF EXT (Pin 23) are all set to a non-zero voltage.

The following provides a overview of the JS1 pins:

Analog Programming (Input)

VREF EXT (Pin 3):
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.
IREF EXT (Pin 22):
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.
TVREF EXT (Pin 4):
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. Typically this pin is jumpered to +10V REF (Pin 21).
TIREF EXT (Pin 23):
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. Typically this pin is jumpered to +10V REF (Pin 21).

Analog Monitoring (Output)

VO2 (Pin 5):
Instantaneous output voltage reference, 0-10 Vdc, proportional to the power supply output voltage. 0 Vdc on VO2 is equivalent to 0 Vdc output voltage, and 10 Vdc is equivalent to 100% full scale output voltage.
IO2 (Pin 24):
Instantaneous output current reference, 0-10 Vdc, proportional to the power supply output current. 0 Vdc on IO2 is equivalent to 0 Vdc output current, and 10 Vdc is equivalent to 100% full scale output current.

Digital Programming (Input)
Digital programming input connections are activated by +5 Vdc signal. A reference signal is provided on +5V (Pin 26), which can be used in conjunction with any of the digital programming pins through the use of an external dry contact.

START (Pin 17):
Enables the power supply output. The input contactors are engaged and the power supply will ramp up to the programmed set points.
STOP (Pin 19):
Disables the power supply output. The input contactors are disengaged and the power supply will ramp down to zero voltage and current.
CLEAR (Pin 18):
Clears a fault condition, returning the power supply to standby.
ARM (Pin 36):
Activates autosequencing through memory states. Function only available on the D Version front panel.
INTERLOCK SET (Pin 37):
+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, 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.

Digital Monitoring (Output)
Digital monitoring output connections are indicated by +5 Vdc signal for high (active), and a 0 Vdc signal for low (inactive). Faults are cleared via CLEAR (Pin 18)

POWER (Pin 8):
Indication that the power supply output is enabled.
THERMAL (Pin 9):
Indication that the power supply hit a thermal alarm fault condition. Pin will stay active until the fault is cleared.
INTERLOCK (Pin 10):
Indication that the power supply hit a interlock fault condition. Pin will stay active until +5 Vdc is restored to INTERLOCK SET (Pin 37) and the fault is cleared.
CUR CTL (Pin 11):
Indication that the power supply is operating in current-mode control.
STANDBY/ALM (Pin 12):
Indication that the power supply is in standby or alarm condition. In both states, the output is disengaged.
ALM (Pin 13):
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
EXT CTL (Pin 14):
Indication that external control mode is activated.
FUSE (Pin 15):
Indication that the fuse alarm is activated.
PGM LINE (Pin 27):
Indication that the program line voltages, on the JS1 37-pin connector, exceeded the manufacturer's recommended levels.
STANDBY (Pin 28):
Indication that the power supply is in standby state.
PHASE LOSS (Pin 29):
Indication that the phase loss alarm is activated.
VOLT CTL (Pin 30):
Indication that the power supply is operating in voltage-mode control.
OCT (Pin 32):
Indication that the power supply hit an over-current trip condition; the power supply exceeded the user-programmed over-current trip level.
INT CTL (Pin 33):
Indication that internal control mode is activated.
OVT (Pin 34):
Indication that the power supply hit an over-voltage trip condition; the power supply exceeded the user-programmed over-voltage trip level.