FAULT FINDING
8
Test 1.
LAMP CIRCUIT.
Check condition of the lamp and lampholder . Replace if worn out.
If lamp is in good condition, check supply.
Junction box terminals 1 + 6 must read 230V *
Test 2
PAN and/or TILT CIRCUIT.
If one or more functions fail :
Open junction box at the back of the searchlight
Check whether supply voltage and movement commands arrive on terminals :
7 + 8 Permanent supply voltage 230 V *
6 + 2 Pan movement right
6 + 3 Pan movement left
6 + 4 Tilt movement up
6 + 5 Tilt movement down
If supply voltage and/or any of the commands fails, check control panel and connections between the control
panel and the searchlight. Restore if necessary.
When supply voltage and commands are correct, open searchlight motor housing from the bottom. Check input
230 V * and 24Vac output on the transformer.
Measure 24Vac input on terminals 1+2 on motor controller junction J3.
If 24Vac on the input is present, output voltage on terminals 3+4 for pan motor and 5+6 for tilt motor should read
24Vdc
when energised according to above mentioned schedule in test 2. If no
24Vdc
on the output replace the
motor controller.
If the
24Vdc
is present, disconnect motor(s) and test separately.
Test 3.
LIMIT SWITCH CIRCUIT
With all four switches in the normally closed mode :
Motor controller junction J2 readings :
terminals 1+2 =
∞
Ω
(
terminals 2+3 =
0
Ω
(
Pan movement
terminals 2+4 =
0
Ω
(
terminals 5+6 =
∞
Ω
(
terminals 6+7 =
0
Ω
(
Tilt movement
terminals 7+8 =
0
Ω
(
Test 4.
HEATER ELEMENT
Junction box terminals 7+8 should read 230V* permanently.
To avoid condensation in the motorhousing it is important that the heater is continuously energised.
* or 110V in case
