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A warning circuit monitors the operational condition of the fans. In case of a fan failure, a
buzzer will sound and the red LED indicating "FAN FAILURE" will light up. The unit should be
switched off immediately and the defective fan should be replaced. NEVER LOAD THE UNIT
WHEN THERE IS AN AUDIBLE ALARM AND THE FAN FAILURE LED IS ILLUMINATED.
The 2 fans are rated for 12 V nominal and are powered from the output voltage of the modules.
A small Printed Circuit Board (PCB) located on the right corner towards the back of the unit is
used to monitor the fans for abnormal operating conditions viz. open circuit or overload condi-
tion due to obstructed rotor.
FRONT PANEL CONTROLS AND INDICATORS
The following controls and indicators are provided on the front panel :
1A. POWER ON/OFF SWITCH. The rocker switch will illuminate when switched on.
1B. BREAKER. A circuit breaker provides protection on the input side against overload
2. VOLTMETER / AMMETER. A combined voltmeter and ammeter are provided. The function
can be switched by the Volt / Amp switch (3)
3. METER CHANGE-OVER SWITCH. Switches the combined meter between ammeter and
voltmeter
4. L.E.D " PSM STATUS (1 to5)". During normal operation, the green LED of each Power
Supply Module (PSM) will light. In case a power supply module (PSM) fails, its corresponding
LED will go off. LED 1 is for the left most module (near the on/off switch)
L.E.D "FAN FAILURE ": In case of fan failure, this red LED lights up and a buzzer is
5.
sounded.
1A.
REAR PANEL CONNECTORS
The following output connectors have been provided (Not shown).
1.
Load+ (Positive), Load- (Negative) LOAD CONNECTORS.
For connecting to the D.C. Load
2.
Battery+ (Positive), Battery- (Negative) BATTERY CONNECTORS.
For connecting external battery for un-interrupted D.C. power to the load.
1B.
5.
4.
3.
4.
2.
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