KEPCO KRR 12-20 Railroad Battery Charger - Manual (Page 3)

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL (718) 461-7000 " FAX (718) 767-1102
http://www.kepcopower.com " email: [email protected]
033006 228-1561 3
3. Connect the ground connection to the ground stud (see Figure 1) using the 10-32 x 3/8 ACF Brass Hex nut provided
(Kepco P/N 102-0007)
4. Turn a-c power on and connect a precision digital voltmeter (DVM) to the + and – VOLTAGE MONITOR test points at the
front panel.
5. Monitor the DVM and set the float voltage as desired using the V. FLOAT ADJUST potentiometer at the front panel. It is
recommended that the unit be tagged with the float voltage.
6. Turn a-c power off and disconnect DVM. If unit is to be mounted at a different location, disconnect ground and a-c input
connections, then reinstall window on front panel.
MOUNTING THE BATTERY CHARGER
1. Two slotted holes, 7 inches apart, are provided on the upper rear chassis (See Figure 1) to wall mount the unit. The unit
has forced air cooling from a single fan located within the integral RKW 15-22K-26534 power supply as well as ventilation
holes in the chassis which must be kept clear from obstructions to ensure proper air circulation. Enough space must be
provided around the chassis to allow the hot air to exhaust from the components inside the chassis.
2. Remove the front panel window protecting input and output connections by loosening two captive screws.
3. Route the AC source power line and neutral wires through the appropriate openings at the top of the chassis and install
on the studs labeled AC INPUT LINE, L1 and L2.
4. Connect ground wire to the ground stud (see Figure 1) using the 10-32 x 3/8 ACF Brass Hex nut provided (Kepco P/N
102-0007)
5. Proceed to CONNECTIING THE BATTERY or, if the battery will be connected later, reinstall the front panel window using
the two captive screws.
CONNECTING THE BATTERY
1. If not done previously, remove the front panel window protecting input and output connections by loosening two captive
screws.
2. Disconnect load from the battery. Route the + and – battery connections through the appropriate openings at the top of
the chassis and install on the studs labeled DC OUTPUT, + and – respectively. NOTE: Verify the polarity! If the polarity is
reversed, the front panel circuit breaker will pop.
3. Reinstall the front panel window using the two captive screws.
IV — OPERATION
USING TEMPERATURE COMPENSATION (OPTIONAL)
Temperature compensation allows the output voltage of the Model KRR 12-20 battery charger to be automatically decreased
or increased for temperatures above or below 77°F (25°C), respectively. Compensation is 3mV/°F/cell (5.4mV/°C/cell), so for a
standard 12 Volt battery using six 2-volt cells, compensation is 18mV/°F. As an example, if temperature measured by the sen-
sor was 80°F, (3°F above 77°F) the output voltage would be decreased by 3 x 18mV or 54mV. Since the temperature is
expected to rise while charging, and then fall as the battery becomes fully charged, temperature compensation can prolong
battery life by adjusting the float voltage automatically.
1. Connect the temperature probe cable to the TEMP PROBE connector at the front panel. Verify that the TEMP PROBE
ERROR indicator is not lit.
2. Attach the temperature probe to the negative (–) terminal of the battery being charged. If the threaded stud is long
enough, mount the probe on the threaded stud and attach with another nut. Otherwise, remove the existing nut and use it
to attach the temperature probe. In either case observe torque requirements when tightening the nut.