Zippy M1S2-5500V4H - Manual (Page 10)

1.9 PINOUTS AND FUNCTION OF THE CONNECTORS
THE LED CONNECTOR OF TOTAL POWER SYSTEM
PIN# COLOR
1 RED
2 BLACK
3 GREEN
THE BUZZER RESET SWITCH CONNECTOR
PIN# COLOR
1 BLACK
2 YELLOW
THE SIGNAL CONNECTOR OF POWER RESET
PIN# COLOR COLOR
1 RED TTL SIGNAL
2 BLACK GND
TTL signal:
Sink current max. 5mA
Source current max. 50uA
Low Active ---Defective
High ---Normal
1.10 SINGLE-MODE and REDUNDENT-MODE
The power supply has two working modes depending on the quantity of power
module inserted, SINGLE-MODE and REDUNDENT-MODE.
1) SINGLE-MODE (only one module inserted and power on)
Notice items:
a) When only one module inserted the detect circuit will assume the other
empty module is Dummy. In this mode, power supply is working at only
one module and without any alarming signals. When module failed, the
power supply shut down.
b) When only module is working then changing to dual modules (Redundant)
working status. Just insert another power module then power on it. There
is no need to power off the system. The detect circuit will assume the
power supply recover the redundant functions. All alarming signals are
functionally when two modules inserted.