.. _front-panel: Operation: Front Panel ====================== The standard |product_type| front panel provides local control and display of the product's various parameters and settings. :numref:`fig-front-panel-alx` provides an overview of the standard MagnaLOAD front panel and :numref:`fig-front-panel-alx-blank` provides an overview of the blank (+BP) MagnaLOAD front panel. A numbered list corresponding to the indicators on the front panels is located below the front panel figures. .. _fig-front-panel-alx: .. figure:: /_common-magnaload/_images/front-panel-alx-label.* :align: center Standard |product_type| front panel overview .. _fig-front-panel-alx-blank: .. figure:: /_common-magnaload/_images/front-panel-alx-blank-label.* :align: center Blank |product_type| front panel overview 1. | Start Button: Enables the DC input bus | Stop Button: Disables the DC input bus 2. Voltage measurement display 3. Current measurement display 4. 4-line character display featuring a menu system, operating status and modes, product messages with diagnostic codes, resistance measurement display, and power measurement display 5. Control power switch, energizes the control circuits without engaging DC bus 6. LED indicator that the DC input is enabled 7. Full control (host) front panel USB port 8. Clean air intake, with integrated fans 9. Aluminium digital encoder knob for programming set-points 10. LED indicator of the MagnaLOAD's present regulation state, which can include: constant voltage (CV), constant current (CC), constant power (CP), or constant resistance (CR) 11. Selector buttons to choose which set-point the digital encoder knob and digital keypad buttons will modify. 12. | Menu Button: Enters the menu system on the 4-line display | Back Button: Moves back one level in the menu | Enter Button: Selects the highlighted menu item | Clear Button: Removes the product from a faulted state | Lock Button: Locks the front panel, with password protection available Set Point Adjustment -------------------- The |product_type|'s set points define the regulation limits. To view the programmed set points, press and release the black digital encoder knob. The set points that can be programmed are in bold, while the unavailable set points are muted. The available set points will vary depending on the configured :ref:`control mode `. The illuminated Voltage, Current, Resistance and Power set point buttons on the front panel correlate to the set point that will be adjusted by the user's input. Pushing one of these set point buttons will change set point to be adjusted, if that set point is available within the selected control mode. There are three methods of adjusting the set point from the front panel: digital encoder knob, keypad, and arrow keys. The black aluminum **digital encoder knob** increases the set point when turned clockwise and decreases the set point when turned counterclockwise. Turning the knob faster will increase the set point adjustment rate. The selected set point is adjusted on-the-fly when the knob is turned, whether viewing the output measurements or whether viewing the set points. The **12-digit keypad** allows a specific number to be entered in. The number entered will not take effect until either the Enter (ENT) button is pressed. Pressing a number will automatically change the display to view all set points. When pressed once and released, the **arrow-up and arrow-down** buttons adjust the set point by the lowest available bit. By pressing and holding these button, a larger set point adjustments will be made. The selected set point is adjusted on-the-fly when the arrow key is pressed, whether viewing the output measurements or whether viewing the set points. .. _setpoint-source: Set Point Source ^^^^^^^^^^^^^^^^ Set points that control the |product| can come from by multiple sources. *Set Point Source* selects set points from these sources and routes them as inputs into the digital controller. When a particular source is selected, set points from all other sources are ignored. By default, the source is set to *local*, where set points originate from the front panel keypad, knob, or communication interfaces. When the source is set to *function generator* , current set point is generated internally, by a periodic function generator block, whose value are defined according to the parameters in :ref:`function`. When *external analog input* is selected, the voltage applied to the rear connector, as described in :ref:`analog-inputs`, are converted into set points. Auxiliary Display ----------------- The |product_type|'s standard front panel features an auxiliary 4-line character display used for two distinct views: the product's :ref:`operating status ` and a multi-level :ref:`menu system `, used for configuring various products settings. .. _front-panel-operating-status: Operating Status Display ^^^^^^^^^^^^^^^^^^^^^^^^ The default display on the auxiliary display provides information about the |product_type|'s present operating conditions, as follows: Status The product's present operating :ref:`status `. Mode The product's presently selected :ref:`control mode ` and active :ref:`computer programming interface `. Message (MSG) A detailed description of the product's present status including steps listed to resolve a fault. Resistance (R) The measured resistance value at the |product_type|'s DC input terminals. Power (P) The measured power being dissipated in the |product_type| through its DC input terminals. .. _front-panel-menu-system: Menu System ^^^^^^^^^^^ A multi-level menu system is provided on the standard front panel to configure the product's various settable parameters. The buttons on the right-hand side of the front panel control navigation through the menu system, with functions as follows: Menu Button Transitions the auxiliary display from the :ref:`operating status ` to the menu system. Back Button Moves up one level in the menu system. While at the top level of the menu system, the Back Button will return to the :ref:`operating status ` display. Up Arrow Button / Down Arrow Button While browsing through the menu system the Up Arrow Button and Down Arrow Button moves item selector up and down, respectively. While keying in a new numeric value for a parameter, the Up Arrow Button and Down Arrow Button increments and decrements the parameter's setting by the lowest available bit. After increment or decrementing the value, the Enter Button must be pressed to save the value. Enter Button While browsing through the menu system, the Enter Button selects the highlighted menu item and transitions to the next level beneath the selected menu item. While browsing a list of settable parameters, pressing the Enter Button will select the highlighted parameter allowing you change its value. While keying in a new numeric value for that parameter, such a set point, pressing the Enter Button will set that new value. Clear Button While browsing through the menu system or through a list of parameters, the Clear Button will exit out of the menu system and return to the :ref:`operating status ` display. While keying in a new numeric value for a parameter, the Clear Button will zero that parameter's value; the Enter Button must then be pressed to set that zero value. The following table provides an over view of the menu system items with a short description of their functions: .. list-table:: :header-rows: 1 :widths: 15 15 15 55 * - 1st Level - 2nd Level - 3rd Level - Description * - **Trip-Point Settings** - - - * - - :ref:`Over Voltage Trip (OVT) ` - - Sets the over voltage trip set-point * - - :ref:`Under Voltage Trip (UVT) ` - - Sets the under voltage trip set-point * - - :ref:`Over Current Trip (OCT) ` - - Sets the over current trip set-point * - - :ref:`Over Power Trip (OPT) ` - - Sets the over power trip set-point * - **Control Modes** - - - * - - :ref:`Voltage Mode ` - - Configures the |product_type| for Voltage Mode * - - :ref:`Current Mode ` - - Configures the |product_type| for Current Mode * - - :ref:`Power Mode ` - - Configures the |product_type| for Power Mode * - - :ref:`Resistance Mode ` - - Configures the |product_type| for Resistance Mode * - - :ref:`Shunt Regulator Mode ` - - Configures the |product_type| for Shunt Regulator Mode * - **Power Range** - - - *ARx Series and WRx Series only* * - - Low - - Series resistors are shorted and loading is done by linear devices only * - - High - - Series resistors are enabled handling approx. 90% of the load * - **Function Generator** - - - * - - Function Type - - * - - - :ref:`Sinusoid ` - Enable sinusoidal set point * - - - :ref:`Square ` - Enable periodic square set point * - - - :ref:`Step ` - Enable manual stepped set points * - - - :ref:`Ramp ` - Enable periodic ramps * - - Function Parameter - - * - - - :ref:`Sinusoid Parameter ` - Configure amplitude, offset, and period * - - - :ref:`Square Parameter ` - Configure high and low level set points and period * - - - :ref:`Step Parameter ` - Configure high and low level set points * - - - :ref:`Ramp Parameter ` - Configure high and low level set points and rise and fall time * - **Communications** - - - * - - RS485 - - Displays baud rate, data bits, parity and stop bits * - - LXI TCP/IP Ethernet - - * - - - MAC - Displays and assigned MAC address * - **Performance** - - - * - - Slew Rates - - * - - - Rise Slew (V/ms) - Sets the |product_type|'s slew rate for rising voltage transitions * - - - Fall Slew (V/ms) - Sets the |product_type|'s slew rate for falling voltage transitions * - - - Rise Slew (A/ms) - Sets the |product_type|'s slew rate for rising current transitions * - - - Fall Slew (A/ms) - Sets the |product_type|'s slew rate for falling current transitions * - - - Rise Slew (|ohm|/ms) - Sets the |product_type|'s slew rate for rising resistance transitions * - - - Fall Slew (|ohm|/ms) - Sets the |product_type|'s slew rate for falling resistance transitions * - - - Rise Slew (W/ms) - Sets the |product_type|'s slew rate for rising power transitions * - - - Fall Slew (W/ms) - Sets the |product_type|'s slew rate for falling power transitions * - - Remote Sense Mode - - * - - - Local - Feedback voltage is taken from the rear +/- input terminals * - - - Remote - Feedback voltage is taken from the rear JS2 screws * - **System Settings** - - - * - - Setpoint Source - - * - - - Front Panel - Setpoints programed in the set point menu take priority * - - - Function Generator - Setpoints generated internally by controller take priority * - - - Analog Input - Setpoints measured on :ref:`External Analog Input ` take priority * - - Analog Digital IO - - * - - - :ref:`Analog Input ` 1 \.\. 4 - Configures individual functions to map to analog inputs 1 to 4 * - - - :ref:`H/S Analog Input ` 6 - Configures individual functions to high speed sampling pin 6 * - - - :ref:`Analog Output ` 1 \.\. 4 - Configures individual functions to map to analog outputs 1 to 4 * - - - :ref:`Digital Input ` 1 \.\. 4 - Configures individual functions to map to digital inputs 1 to 4 * - - - :ref:`Digital Output ` 1 \.\. 8 - Configures individual functions to map to digital outputs 1 to 8 * - - Fan Speed - - * - - - Variable - Adjust fans speed as a function of load and temperature * - - - Max - Turns fans speed to 100% * - **About** - - - Shows manufacturing and firmware information about the |product_type|