Xantrex Technology GPIB-XPD manual OVP Control Mode Selection

Installation and Configuration

Internal PCB Jumper Selections

the front panel LOCAL switch, control of the OVP trip level changes from software control to the front panel OVP potentiometer. The default OVP trip level is set as 110% of the power supply's rated output voltage. See Table 2.5, on page 22 for a complete list of remote power ON default settings.

You can isolate the location of OVP control by changing the positions of the Local OVP Control jumper J2 and the Remote OVP Control jumper J20. The default jumper settings allow control of OVP to depend on the operating state of the power supply. By physically changing the jumper settings, you can isolate the location of OVP control to software control only or front panel control only. Table 2.6, “OVP Control Mode Selection” shows a table of jumper settings and OVP programming selection. Refer to “Basic Setup Procedure” on page 19 for the positions of the jumpers on the GPIB PCB.

Table 2.6 OVP Control Mode Selection

PCB Jumper J2	PCB Jumper	OVP Programming Selection
Position	J20 Position
Closed (default)	Closed (default)	Software or Front Panel OVP control
		(dependent on the power supply operating state)
Closed	Open	Software OVP control only
Open	Closed	Front Panel OVP control only
Open	Open	Front Panel OVP control only

TTL You can use the Shutdown function to disable or enable the supply's output. Shutdown Disabling the supply using TTL shutdown allows you to make adjustments to the

load or to the power supply without shutting down the power supply. With the GPIB interface installed, TTL shutdown is activated by a TTL signal to Pin 1 of the J21 connector on the interface subplate. The shutdown user line uses a 0-5Vdc TTL input with a high signal range of 2.2-5.0Vdc. The current range of the shutdown line is 1-10mA. See Figure 2.5, “J21 User Signal Connector Circuit Block Diagram” on page 27 for a schematic of the J21 connector containing the shutdown user line.

You can select the logic level of the TTL input by changing the J3 connector on the GPIB PCB. Table 2.7 shows the TTL signal levels for the J3 jumper settings. See Figure 2.2-3 for the location of the J3 jumper on the printed circuit board.

24 Operating Manual for GPIB for XPD Series Power Supply