KEPCO KRR 24-50 Instruction Manual

I N S T R U C T I O N M A N U A L
KEPCO
I — INTRODUCTION
SCOPE OF MANUAL.
This instruction manual covers the installation and operation of the Model KRR 24-50 24-Volt, 50-Ampere Railroad Battery Charger.
• Do not operate the unit without proper grounding. Improper grounding risks an electric shock that could result in
injury or death.
• Do not touch the unit's input or output terminals to avoid the risk of electric shock that could result in injury or death.
Energy stored in the unit's output capacitor is present on the DC OUTPUT terminals for a few seconds even after the
a-c input voltage is removed.
• The Float Voltage and Current Limit must be preset prior to starting the initial charge to avoid damage to the battery
being charged.
• To avoid damage to the unit or the battery being charged, never obstruct the ventilation holes at the sides of the unit.
The unit must be installed in a properly ventilated area, free of smoke and corrosive or explosive vapors.
DESCRIPTION.
The Model KRR 24-50 24-Volt, 50-Ampere Railroad Battery Charger is a wall-mounted unit designed to charge 24-Volt lead-acid or
nickel cadmium batteries used in railroad applications. The output voltage is set to 26.8V d-c, and is adjustable from 18.8 to 32.4V d-c
from the front panel recessed trimpot. Similarly, the output current limit is set to 50A d-c and is adjustable from 10 to 50A d-c from the
front panel recessed trimpot. An optional temperature compensation probe (not supplied) provides automatic adjustment of the float
voltage to accommodate temperatures from 0° to 35°C. Units may be operated with a nominal 100V a-c to 240V a-c (input voltage range
85 to 265 Va-c), 50-100 Hz (see Table 1, Note 1). Both line and neutral lines are protected by 25A fuses. A front panel ammeter shows
charging current.
The heart of the Model KRR 24-50 is a solid-state switching power supply which has an integral cooling fan. A front panel CHARGER
ON indicator lights while input power is applied to the a-c input terminals and the unit is operational. The front panel TEMP PROBE NOT
CONNECTED indicator lights to show that the temperature compensation probe is not attached to the unit. An internal diode network
across the output provides protection in the event that the battery connections are reversed, causing the front panel circuit breaker to
open.
FEATURES
• Wide Range Input - Operates from input voltage range of 85 to 265V a-c, input frequency range 47-100Hz
Note 1)
• Adjustable Float Voltage - The float voltage is factory set to 26.8V d-c, and is adjustable, using the tool on the back of the
front panel door (see Figure 1), from 18.8 to 32.4V d-c at the front panel by connecting a precision digital voltmeter to the +
and – VOLTAGE MONITOR test points and adjusting the output using the V. FLOAT ADJ potentiometer.
• Adjustable Current Limit - The current limit is factory set to 50A d-c, and is adjustable, using the tool on the back of the
front panel door (see Figure 1), from 10 to 50A d-c at the front panel using the C. LIMIT ADJ potentiometer.
• Temperature Compensation - Optional temperature compensation probes (Models TEMPCO-10 (10 ft. long), TEMPCO-
50 (50 ft.), TEMPCO-100 (100 ft.) and TEMPCO-200 (200 ft.), not supplied) provide automatic adjustment of the float volt-
age to accommodate temperatures from 0° to 35°C for lead-acid batteries. For other lengths, consult factory.
• CHARGER ON indicator - on while a-c input power applied to unit and unit is operational.
• Charging Current ammeter - indicates charging current
• Input protection - Two line fuses (25A/250V) are provided.
• Battery connection protection - If battery connections are reversed, an internal diode network across the output is for-
ward biased; the resulting current flow causes the front panel circuit breaker to pop open. The connections must be
switched and the circuit breaker pushed in to reset.
• Form C Relay Contact - Used for Battery Charger fault alarm.
• Remote ON-OFF - Isolated Remote On-Off control of Battery Charger output.
KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A. TEL (718) 461-7000  FAX (718) 767-1102
©2024, Printed by permit.
Data subject to change without notice
An ISO 9001 Company.
24-VOLT, 50-AMPERE
RAILROAD BATTERY CHARGER
WARNINGS and CAUTIONS
with no adjustment or modification required.
www.kepcopower.com   email: hq@kepcopower.com
228-2012
KRR
24-50
(see Table 1,
1