Xantrex XKW 12-150, Operating Manual

Page: 67 / 90

Operation
Using the Shutdown Function
Revision A
65
Using the Shutdown Function
The Shutdown function is used to disable or enable the supply's output voltage and
current. It can be used to allow adjustments to be made to either the load or the power
supply without shutting off the entire supply. This function may be activated from
the front panel at any time by using the STANDBY switch. It can also be activated
via remote programming, using positive or negative logic, with a TTL compatible
input or with an AC or DC signal.
STANDBY
Switch
The STANDBY switch is a press ON/press OFF switch located on the power
supply's front panel. See the front panel diagram,
Figure 1.1, on page 19 . When
pushed IN, or depressed, the Shutdown circuit is activated, the output voltage and
current fall to zero and the S/D (Shutdown) LED on the front panel is illuminated.
Pushing the switch once more resets it to its OUT position and normal power supply
operation is resumed.
Programming
the Shutdown
Function
The Shutdown circuit uses either a TTL compatible signal, or a 12-250Vac or
12-130Vdc input, to disable or enable the power supply output. Connections for
either TTL, AC, or DC input signals are made at connector J3. Internal switch
SW1-8 settings determine whether positive or negative logic for the signal is used.
The input lines for the Shutdown circuit are optically isolated and can therefore be
used by input sources with a voltage differential of up to 400Vdc.
External Wiring Use 20 to 24 AWG wiring when making connections to the J3
connector. Keep wiring as short as possible.
TTL Shutdown To activate the Shutdown function using a TTL compatible input:
1. Turn off the power supply and disconnect the AC power source. Allow five (5)
minutes to elapse to dissipate stored energy before making connections or
resetting switches.
2. Connect the TTL signal source to pin 14 (TTL Shutdown Input/positive) and
pin 2 (Return for Shutdown Input) on the J3 connector on the rear panel. See
Figure 3.15 and Figure 3.16 .
!
CAUTION
The external voltage applied to J3 connector pins 1 and 2 (Shutdown input and
return) cannot exceed 250V rms with respect to the supply’s negative output or the
supply may be damaged
.
TM-25OP-01XN.book Page 65 Monday, April 5, 2004 8:58 AM