Specifications

REMOTE MONITORING AND SIGNALLING
A provision has been made for remote signaling and monitoring of the following operational
conditions and parameters:
1. Operational status of the 5 Power Supply Modules (PSM)
2. Failure condition of the cooling fan(s)
3. Availability of AC input power
4. Output voltage measurement
5. Output current measurement ( Voltage across an internal shunt with Shunt ratio of 50
mV / 100 A or 0.5 mV per Amp)
Signaling of operational conditions as at serials 1, 2 and 3 above is opto coupled with open
collector, NPN transistor outputs. The collector and emitter of each opto coupled transistor are
accessible to the external user interface through the 25 pin D-Sub connector. Each open collec-
tor, opto coupled NPN transistor can provide a maximum of 50 mA with a collector to emitter
voltage of up to 35 V.
Outputs for voltage and current measurements at Serials 4 & 5 above are direct analogue volt-
ages. The pin out of the 25 pin D-Sub connector providing the above signals for user interface
is given below:
* This signal is the voltage across an internal shunt at 0.5 mV per Amp (Shunt Ratio is 50 mV / 100 A)
PROTECTIONS
SHORT CIRCUIT PROTECTION: In the event of a short circuit, the PWM controller will be shut down and
the output will drop to near 0 V. The green LEDs will flash. The unit will reset automatically once the short
circuit condition is removed
CURRENT LIMITING: The unit will enter this mode when the load tries to draw more than the limiting values
of currents as shown in the specifications. Under this condition, there will be loss of voltage regulation and
the output voltage will drop. The “PSM STATUS” LEDs will, however, remain illuminated, but dimmed. When
the overload reaches approximately 140A for SEC-100BRM or 112A for SEC-80BRM or 84A for SEC-60BRM
or 56A for SEC-40BRM (the output voltage will be approximately 2.7V), the unit will shut down (will enter
hiccup mode). The PSM status LEDs will start flashing and PSM status signal for remote indication will oscil-
late between High and Low. The unit will reset automatically as soon as the overload condition is re-
moved .
INPUT SURGE PROTECTION : The unit is protected against input voltage surges. In case of input spike/
surge, the A.C. side breaker will trip. The 4A fuse on the module will also blow.
Item Pin
No.
Color Code
of Wire
Output Pin of
Opto-coupler
Operational Condition
or Parameter (High)
1 2 Black Collector AC input is available
16 White Emitter
2 12 Orange Collector Fan failure
19 Green Emitter
3 7 Gray Collector PSM 1 Normal
20 Violet Emitter
4 8 Violet Collector PSM 2 Normal
21 Blue Emitter
5 9 Blue Collector PSM 3 Normal
22 Green Emitter
6 10 Green Collector PSM 4 Normal
23 Yellow Emitter
7 11 Yellow Collector PSM 5 Normal
24 Orange Emitter
8 25 Red - Voltmeter +
13 Black - Voltmeter -
9 18 Gray - * Ammeter +
6 Blue - * Ammeter -
5.