La Marche A36D, Instructions Manual

Page: 21 / 33

MODEL A36D SERIES - INSTRUCTIONS AND TROUBLESHOOTING
Page 21 of 33
11.7 S2A-255 PROGRAMMING AND TRIAC GATE RESISTOR INTERFACE
The circuit programs the input voltage for 12, 24, & 48V units and programs the triac gate resistor for 12,
24, or 48V models. The board keeps input voltage to S2A-205/205S at a low level.
12.0 TROUBLESHOOTING
Troubleshooting should be performed only by trained service personnel or experienced electricians.
CAUTION: Hazardous AC and DC voltages are present within the rectifier cabinet.
Equipment: The only equipment required is a multimeter and analog ohmmeter for voltage readings.
12.1 GENERAL INSPECTION
On servicing new equipment, before setting up any complicated testing, give the unit a general inspection.
Check the following:
1. Check DC output cables, connections, battery type, and number of battery cells with rectifier rating.
2. Check unit specifications with customer order.
3. Check input connections, input voltage and line breaker size.
4. Check for shipping damage, loose connections, broken wires, etc.
5. Certain failures can be caused by defective batteries and customer loads; make sure batteries and loads
are free from defects.
NOTE: If the problem is found to be located in the printed circuit boards, the board should be replaced.
No attempt should be made to repair circuit boards in the field.
12.2 SERVICE INFORMATION
Information you should have when calling in for troubleshooting assistance:
1. Equipment model number and serial number.
2. The actual AC input voltage.
3. The DC output voltage with and without the battery.
4. Result of the check of AC breaker and DC output fuse.
5. The actual DC output current and voltage when measured with battery and load connected to rectifier.
12.3 SYMPTOMS & CAUSES
12.3.1 AC Breaker trips.
Possible Cause:
1. Wrong AC input voltage.
2. The AC input taps on power transformer set incorrectly.
(See schematic wiring diagram)
3. An AC to DC short or AC or DC short to ground (see ground short circuit test).