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MODEL TPS - INSTRUCTIONS AND TROUBLESHOOTING INFORMATION
14 OF 20
CPN 40615
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.
11.0
CIRCUIT DESCRIPTIONS
11.1 CIRCUIT OPERATION
The Model TPS 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.
In the current limit mode the triac is also fired to regulate the unit output current in the same manner.
In this case, however, the unit d.c. current is being monitored, compared against the current limit set
point and control is applied to the triac.
The silicon diodes SDI rectify the a.c. output of the transformer PT into pulsating D.C. and the filter
components C3 and L2 smooth this output and reduce ripple.
11.2 S2A-188 REGULATOR ASSEMBLY
The regulator assembly contains the circuits which sense the d.c. output changes and fire the (triac) TR-
1 to make the necessary corrections.
The triac is timed from the a.c. output of the transformer PT. This assembly also produces the current
limit and the current walk-in features.
The regulator board includes the circuitry for the status lights and alarm settings and the output to the
shunt trip circuit for the a.c. input breaker which is used for the high voltage shutdown.
The Float/Equalize switch and alarm lights are arranged so that they may protrude through the front
panel of the unit.
11.3 AC12-1 POWER FAILURE SWITCH
This assembly is used to electronically switch off the bleeder resistor RL during periods of a.c. failure.
This prevents the battery from being discharged back through unit circuitry.
11.4 S2A-149 SNUBBER
This circuit is used to provide DV/DT voltage suppression for the triac switch TR-1. It prevents false
firing and voltage transients.