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SeCtION 4 |
The heat generated due to internal power dissipation is removed by forced cooling
through two high power D.C. fans mounted at the back of the unit which suck air from
The vents on the sides of the unit & blow outwards from the rear of the unit. it is
extremely important that the discharge side of the fans and the suction sides of the
vent slots are not blocked.
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 12V 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 condition due to obstructed rotor.
SeCtION 5 |
The following controls and indicators are provided on the front panel :
1. A. power on/oFF Switch – The rocker switch will illuminate when switched oN.
b. 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 to 5)" – During normal operation, the green LED of each power
supply module (PSM) will light. In case a power supply module (PSM) fails, its corre-
sponding LED will go off. LED 1 is for the left most module (near the oN/off switch)
5. l.e.d "Fan Failure " – in case of fan failure, this red LED lights up and a buzzer is
sounded.
1A
1b
OFF
ON
627-2011_SEC40BRM_BACK
8 | SAMLEX AMERICA INC.
Cooling & warning for Fan Failure
Front Panel Controls & Indicators
LOAD -
LOAD +
4
5
PSM STATUS
FAN FAILURE
METER
VOLT
3
BATTERY -
BATTERY+
2
N + 1 DC POWER SYSTEM
AMP
www.samlexamerica.com
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