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FAN FAILURE WARNING INDICATOR AND ALARM: If forced air cooling is stopped due to
failure of any one or both the fans, the red "FAN FAILURE" LED will be illuminated and an
alarm buzzer will be activated. At the same time, a "High" signal will be fed to the opto-coupler
for signaling "fan failure" for remote monitoring (see Page 5). The unit is required to be switched
off immediately as loss of forced air cooling may result in major damage to the unit.
INSTALLATION AND OPERATION
1.
Ensure that the space where the unit is to be installed has adequate air supply for cooling.
There should be no obstruction on the suction vent slots on the sides of the unit or on the
discharge side grilles of the fans on the back of the unit.
2.
Switch off the on/off switch on the front panel.
3.
Switch off all the D.C. load(s) to be connected to this unit.
4.
Connect the Load+ and Load- at the back of the unit to the D.C. load(s) or the DC bus.
Ensure the wire or bus bar used to connect the load or the D.C. bus is of proper cross-
section to carry the desired load current. Tighten the screws to ensure firm connection.
5.
In case external battery is required for battery back-up, connect the positive of the battery
to Battery+ and negative of the battery to Battery-. (See details under "operation of the
battery back-up")
6.
Plug the unit into the 230 V, 50/60 Hz standard AC outlet of appropriate current capacity.
7.
Switch on the unit by pressing the power on/off switch to on position. The switch will be
illuminated confirming that input power is available.
8.
A short beep may be generated by the temperature fault alarm circuit on powering on the
unit . This is normal. Please disregard.
9.
The PSM Status LEDs will light and "on" signal will be fed to the associated drives of the
opto-couplers for remote monitoring / indication through the 25 pin D-sub connector. As
explained under Design & Principle of Operation on page 3, a minimum load current is
necessary to operate the current share control circuitry of the PSMs. It is likely that due
to the drift in the pre-set values, the minimum internal preload current may not be
sufficient to provide adequate feedback signal strength resulting in shut down of
one or more modules when no external load is present (The associated PSM Status
LED will flash and also, the associated signal for driving the opto couplers for re-
mote indication will oscillate between "on" and "off" conditions). As soon as exter-
nal load is applied to the unit, the feed back signal strength will increase and the
PSM(s) that were shut down will also operate normally.
10.
Switch the volt/amp change-over switch to the "VOLT" position. The voltmeter should read
14 V on no load (Please see explanation on Page 7)
11. Switch on the D.C. loads. The output voltage on load should be 13.65V to 13.35V
(Please see explanation on Page 7)
12. Switch the Volt/Amp meter switch to "AMP" position to read the load current. Ensure that
the load current is within the total rated continuous load of the modules installed.
6
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