A1 Voltage Chart - Simplex 4100 Installation Manual

4100/4120 INSTALLATION MANUAL
If the voltage and signals are correct on the return field wiring, the next step is to localise the trouble by swapping
printed circuit boards of the same type. Perform the following procedure to swap printed circuit boards:
1. Disconnect battery power.
2. Turn system power OFF (AC).
3. Remove the suspected printed circuit board from the motherboard.
4. Remove a printed circuit board of the same type from the system (when available) or from branch stock.
5. Set the "good" printed circuit board address to match the white "address label" on the motherboard
(where the "bad" printed circuit card was located). If a printed circuit board is swapped from within the
system, set the "bad" printed circuit board address to match the white "address label" on the motherboard
(where the "good" printed circuit board was located).
6. Install both printed circuit boards ("good" and "bad").
7. Apply AC power to the system.
8. Apply DC power to the system.
9. "ACK" all abnormal conditions.
If the visual indications change, the problem is in the "bad" printed circuit board. If the symptoms do not change,
check inputs and outputs from the now "good" printed circuit board.
Voltages and signals on the terminals should match the Voltage Chart shown below.. Note the voltages given in
the chart are with reference to the negative (-) of the 24V power Supply. When field wiring is removed, remove
and mark one wire at a time. Ensure that the wiring is properly replaced to prevent additional fault indications.
Use the Voltage Chart as required.
MONITOR
CIRCUIT
SIGNAL
CIRCUIT
SUPERVISED
ANNUNCIATOR
Document No: 4100-M002
Positive Negative
Terminal Terminal
28 VDC
28 VDC 6-18 VDC
28 VDC 28 VDC
28 VDC
7 VDC 28 VDC
28 VDC
0 VDC 28 VDC
16 VDC 28 VDC
28 VDC 25 VDC
28 VDC 0 VDC Pulsing
0 VDC
28 VDC
Figure A1
Voltage Chart
33
3 VDC Normal Circuit
Current Limited Alarm
Short Circuit Alarm
0 VDC Open Circuit
Normal Circuit
0 VDC Alarm Condition
Open Circuit
Installed Reverse Polarity
Normal Circuit
Alarm Condition
0 VDC Lost Annunciation Common
0 VDC Open Circuit
Issue 1.0