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g. DC Ammeter (M1)
The charger's dc ammeter (M1) measures a shunt (R13) connected in series between the charger's output
and battery. The shunt is a 100A / 100mV shunt or 50A / 50mV shunt, depending on the model. But in either case
the signal is 1mV for every Ampere out. Like the dc voltmeter (M2), it will only indicate if the charger's ac breaker
(CB1) is on and input power is connected.
h. Filter Capacitors (C1, C2)
...!
CAUTION...
charged by the battery. Making the connection at the battery while the dc circuit breaker (CB2) is on may cause an
arc at the battery terminal. Always turn off the dc circuit breaker (CB2) when connecting the battery. When the
charger is turned OFF (ac and dc circuit breakers opened) the capacitor will take a minute to discharge into the
bleeder resistor (R1). Filter capacitors (C1, C2) should always be checked for voltage before starting work inside the
battery charger.
...NOTICE...
Capacitors (C1, C2) may consist of one or more parallel-connected capacitors.
Before attempting to check the output ripple, it should be determined that in all other respects the charger
is operating normally. Having determined this, the ripple may be checked by connecting a sensitive ac voltmeter
(digital type preferred) to the battery terminals and measure the ac ripple voltage. If it measures more than 200 mV
rms, do the following:
1. Check all filter capacitors (C1, C2) for any physical damage
2. Check wiring to capacitors for possible loose connections
3. Check to see if both the SCRs (Q1/Q2) are firing. (If only one of the SCRs is turning on,
the charger will make a rumbling sound when current is flowing.)
UNIVERSAL MAINTENANCE CHARGER (UMC)
To place an order for spare parts or replacement parts, please contact your sales representative and
refer to the supplemental PARTS DATA PACKAGE REPORT, located at the end of this manual.
To help us ensure you receive the correct replacement parts, please provide the following
information for each component:
• Model number and serial number of your battery charger
• Reference Designator from the schematic diagram (JE5039-##)
• Factory part number and description from supplied Parts Data Package Report
• Quantity required
Part numbers and descriptions may differ due to changes to design since manual printing.
When the dc circuit breaker (CB2) is turned ON, the filter capacitors (C1/C2) can be
REPLACEMENT COMPONENTS
6
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