Lamarche A36F Instructions Manual - page 12
A36F - 3 PHASE - INSTRUCTIONS AND TROUBLESHOOTING
Page 12 of 21
§ Float-Equalize Switch:
This switch is located on the unit front panel. When it is in the float position, the rectifier will maintain
the battery at the voltage level which was preset by the “Float” potentiometer adjustment and at the
same time maintain the load up to the rectifier’s rated output.
10.3 EQUALIZE ADJUSTMENT
The equalize adjustment is factory set at 2.33 volts/cell (Lead) or 1.55 volts/cell (N.C.). Turning the
adjustment, which is located on the front panel of the unit, clockwise raises the equalize voltage (the F/E
switch must be in the equalize position). The adjustable range is as follows:
2.25-2.4 volts/cell +/- .1 Volts (Lead)
1.5 - 1.6 volts/cell +/- .1 Volts (N.C.)
In the equalize position, the rectifier will maintain the battery at the voltage level preset by the “Equalize”
potentiometer adjustment and at the same time maintain the load up to the rectifier’s rated output.
SIZE
AWG.
AREA
CIR.
MILS
SIZE
AWG.
MCM
AREA
CIR.
MILS
SIZE
MCM
AREA CIR.
MILS
18
1,620
1
83,690
600
600,000
16
2,580
0
105,600
700
700,000
14
4,110
00
133,100
750
750,000
12
6,530
000
167,800
800
800,000
10
10,380
0000
211,600
900
900,000
8
16,510
250
250,000
1000
1,000,000
6
26,240
300
300,000
1250
1,250,000
4
41,740
350
350,000
1500
1,500,000
3
52,620
400
400,000
1700
1,750,000
2
66,360
500
500,000
2000
2,000,000
TABLE 3
11.0 CIRCUIT DESCRIPTIONS
11.1 CIRCUIT OPERATION
The Model A36F-3 PHASE rectifier circuit design is a controlled ferroresonant converter. The power
transformer PT provides a.c. to d.c. isolation, voltage step down, and inherent magnetic current limit.
The secondary circuit of PT & capacitor C2 form a resonant tank circuit. The secondary voltage of the
transformer is controlled by the shunt control which consists of choke L1 and the a.c. switch TR-1. The
semiconductor TR-1 is a triac.
The triac is phase controlled by the regulator assembly S2A-188. As the unit output voltage rises the
triac is turned on for more time and vice versa. This switches the choke L1 across the resonating winding
of PT which reduces the transformer output and lowers the unit output voltage.