SWT 3000 Equipment Manual Power Supply
© SIEMENS AG 2006 Edition p3_3_x 08/09 Page - 9
Inhibit loop
The presence of the PU3f and CLE/FOM-1 modules is monitored by an inhibit loop. If the PU3f
and/or CLE are pulled this interrupts the monitoring loop and the secondary voltages from PS1 and
PS2 (if present) are disconnected.
PU3f
CLE/FOM1
PS1
PS2
a21
c21
a21
c21
GND
BPSWT 3000
GND
1
23
X41
PS
FOM2
a21
c21
GND
1
23
X42
Figure 5: Inhibit loop for the power supply(ies)
An On/Off switch (PS) on the PU3f (not accessible from outside) also in-
terrupts this monitoring loop.
If only the CLE resp FOM1 module is not used the jumper X41 must be
inserted in position 1-2.
If the FOM2 is not used the jumper X42 must be in position 1-2.
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