Pulsar TC-10B, User Manual

Page: 88 / 190

9.1.2 Power Supply PC Board
Figure 9-2 shows component locations for the
Power Supply Module.
Control is as follows:
Jumper J1 for optional Alarm Relay; estab-
lishes loss of power condition (NO/NC).
9.2 Power Supply Circuit
Description
The module comprises the following circuits:
• Fuses
• ON/OFF Switch
• Input Filter
• Power Alarm Failure Relay
• dc/dc Converter (2)
• Output Filter
Fuses
48V 125V 250V
F1, F2 3A 1.6A 3/4A
ON/OFF Switch
S1 - Push button Switch (DPDT)
When in the “ON” position (pins 1 and 4), dc
current flows through the input filter to the dc/dc
converter.
Input Filter
The input filter (C1, C2, C3) contains zener diodes
(Z1, Z2) that provide protection against surges, a
diode (D1) that provides protection against
reverse polarity, a differential choke XFMR (L1),
and the Red Input LED1.
Power Alarm Failure Relay
This circuit includes:
• K1 - Alarm Relay
• J1 - Jumper (NO/NC)
In versions G01, G02, and G03 the field-selec-
table option can change the alarm contact
de-energized state to NO or NC. (It is currently
shipped in the NC de-energized state, and can be
changed to NO if desired.)
DC/DC Converter
The two dc/dc converters (PS1 and PS2) operate
at a maximum of 1MHz and, as a result, switching
noise is outside the 30-535kHz range of the
TC–10B/TCF–10B. The converter outputs,
+20Vdc and -20Vdc, is fed to the output filter.
(See Figure 9-3.)
Output Filter
The output filter for the +20V consists of C4, C6,
C8, and Z4. The output filter for the -20V consists
of C5, C7, C9, and Z3.
9.3 Power Supply
Troubleshooting
The three test jacks on the control panel:
• TP3 (+20Vdc)
• TP2 (Common)
• TP1 (-20Vdc)
can be used to determine if the two voltages
(+20Vdc, -20Vdc) are present. In addition, LED2
output indicates that the dc/dc converters are
generating voltage. LED1 input indicates that
voltage is present at the input of the dc/dc
converter.
For basic troubleshooting, perform the following
procedure:
1. If LED1 is not on with the module energized,
turn off switch S1, remove and check the
fuses (F1, F2) with an ohmmeter.
2. With the module de-energized, check the
ON/OFF switch (S1) with an ohmmeter to be
sure it opens and closes accordingly.
Page 9–2 October 2003
TC–10B System Manual
Technologies, Inc.
NOTE
When the alarm is part of the system, JU1 is
shipped in the NC state.