Local Operation
Using the Shutdown Function
Revision A
61
Using the Shutdown Function
Use the Shutdown function to disable or enable the supply’s output so that you can
make adjustments to either the load or the power supply without shutting off the
entire supply. Activate this function from the front panel at any time by using the
STANDBY switch. You can also activate it via remote control through the rear panel
J2 connector, using a 2.5 V to 15 V signal or a transistor-transistor logic (TTL)
compatible input. The input lines for the Shutdown circuit are optically isolated.
STANDBY
Switch
The STANDBY switch is a press-button switch located on the power supply's front
panel. Pushing the switch to its IN position activates the Shutdown circuit. The
output voltage and current drop to zero and the S/D (shutdown) LED turns on.
Pushing the switch to its OUT position returns the power supply to normal operation.
Controlling
the Shutdown
Function via
the J2
Connector
The Shutdown circuit accepts a 2.5 V to 15 V signal to disable or enable the power
supply’s output. Make connections for signals at connector J2, located on the unit's
rear panel. Set rear panel switch SW1-7 to select signal logic. See
Section 1
for more
information about making J2 connector or SW1 switch changes.
To activate the Shutdown function:
1. Turn the power supply OFF.
2. Connect the signal source to J2 connector terminal 11 (Shutdown Input/positive)
and terminal 12 (Shutdown Return).
3. Set switch SW1-7 to select the desired circuit logic as set out in
Table 3.2
.
4. Turn on the power supply.
The power supply will operate as described in
Table 3.2
according to the logic you
select and the level of the input signal you provide. The S/D LED on the front panel
turns on when the Shutdown circuit is activated.
Table 3.2
Switch Settings for Shutdown Circuit Logic
Note:If switch SW1-7 is set to ON but there is no signal applied, the S/D LED turns
on and the power supply will not provide an output until the HIGH signal level is
applied.
Switch SW1-7 Setting Source Signal Signal Level Supply Output
S/D LED
OFF (OPEN)
(Active low, default)
2-15 V
HIGH
OFF
ON
0-0.4 V
LOW
ON
OFF
ON (CLOSED)
(Active high)
2-15 V
HIGH
ON
OFF
0-0.4 V
LOW
OFF
ON
TM-XROP-01XN.book Page 61 Monday, March 22, 2004 4:10 PM
Summary of Contents for XHR 7.5-130
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Page 3: ...Operating Manual for XHR Series Programmable DC Power Supply...
Page 14: ...List of Figures xii Operating Manual for XHR Series Power Supply...
Page 16: ...List of Tables xiv Operating Manual for XHR Series Power Supply...
Page 49: ...Installation Load Connection Revision A 47 Figure 2 9 Multiple Loads with Remote Sensing...
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