External Circuit Wiring; Circuit Breakers; Rectifier Diodes - HindlePower SCR series Operating Instructions Manual

Expected Voltages (AC)
Approximately 2 times float
voltage, see page ii
120V AC
NOTE: The "X" of Table B voltages should be measured as they terminate on the full-wave bridge
components. All other voltages may be measured on the terminal strip on top of T1. Where power rectifier
fuses are employed in the larger power chargers (see custom diagrams and parts list), these fuses should
also be checked, and replaced if unserviceable.
b. External Circuit Wiring
1. When no line voltage exists between terminals L1 and L2 of TB1 check the AC line back to
source.
2. With no output, or a low output, the external DC wiring may be at fault. Check the wiring
between charger and battery to see that it is properly installed. Make certain that terminals are tight and
clean, and that the DC wiring is free from grounds. The total operating voltage drop in the loop or leads
between the charger and battery terminals should never exceed 0.5 volt (at rated charge current), and
preferably should be kept considerably below this limit by using a sufficiently large wire size.
c. Circuit Breakers
1. AC Circuit Breaker, CB1: When an AC voltmeter of suitable range is connected between leads
L1-L2 and indicates line voltage, but does not indicate when connected to the output terminals of CB1
when closed, the circuit breaker is probably defective. Deenergize the AC supply to the charger and
remove the leads to the circuit breaker. Use a voltohmmeter to check for continuity between the circuit
breaker terminals with breaker manually closed. Zero resistance should be indicated if the unit is
operative. If unit checks OK, check performance by measuring the AC voltage drop across each pole of the
breaker. This voltage should be under 0.1 volt when the load current is normal. If a higher voltage drop is
found, replace the breaker.
2. DC Circuit Breaker, CB2: When the DC circuit breaker is suspected of being inoperative or at
fault, a similar test to that made for the AC breaker will determine the operating condition of the breaker.
3. If the polarity protection diode, CR1, is shorted, the battery will discharge into CR1 which will
trip the DC circuit breaker, CB2. Check CR1 with an ohmmeter (both polarities) for a shorted condition
and replace if required.
d. Rectifier Diodes, SCR1, SCR2 (also see Section III, 2, f)
TABLE B
SECONDARY VOLTAGE OF TRANSFORMER T1
(USE AC VOLTMETER)
Leads or Locations
X1 to X5
Y1 to Y2
6