KEPCO, INC.
131-38 SANFORD AVENUE
FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000
FAX (718) 767-1102
www.kepcochargers.com
email: [email protected]
010510
228-1600 REV 3
3
CONNECTING THE BATTERY
1.
With DC output circuit breaker pulled out to interrupt the output circuit
open the access door and route the + and – battery con-
nections through the appropriate openings at the bottom of the chassis and secure to the DC OUTPUT, + and – terminals, respectively.
NOTE: Verify the polarity! If the polarity is reversed, when the front panel circuit breaker is pushed in, it will pop. If this occurs, recon-
nect the battery correctly and push the circuit breaker in to reset.
2.
Close the access door and snap in the retainer.
III — OPERATION
USING TEMPERATURE COMPENSATION FOR LEAD-ACID BATTERY (OPTIONAL)
Temperature compensation can prolong battery life by adjusting the float voltage automatically. Temperature compensation allows the out-
put voltage of the KES battery charger to be automatically decreased or increased for temperatures above or below 77°F (25°C), respec-
tively, in the 0°C to 35°C range. Beyond this range, the compensation is clamped to 0°C and 35°C for temperatures below 0°C and above
35°C, respectively. Compensation is 3mV/(°F)(cell) or 5.4mV/(°C)(cell), and can be calculated as follows:
∆
V = – (K
T
) (T
a
– 77) (V
B
/2.23)
where V
B
= Battery voltage, K
T
= 0.003V/(°F)(cell), T
a
= ambient temperature in °F and 2.23 = cell voltage at 77°F. Thus, for example, to
calculate the float voltage V
F
of a 52.5V battery charging at 80°F: V
F
= V
B
+
∆
V = 52.5 –(0.003)(80–77)(52.5/2.23) = 52.5 – 0.212 =
52.288V.
1.
Connect the temperature probe cable to the TEMP PROBE connector at the front panel. Verify that the TEMP PROBE NOT CON-
NECTED 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 it 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.
CHARGING THE BATTERY
1.
If the float voltage has been preset, proceed to step 2. Otherwise, refer to PRESETTING THE OUTPUT under INSTALLATION and set
the float voltage for the battery to be charged.
2.
Connect the battery (see INSTALLATION). If the circuit breaker pops, the battery connections are reversed; reverse the battery con-
nections, and push the circuit breaker in to reset.
3.
Install temperature compensation if desired (see previous paragraph). Verify all battery and a-c line connections are tight.
4.
Apply a-c source power to the unit. The front panel ammeter indicates the charging current. NOTE: If the CHARGER ON indicator fails
to light, verify that a-c source power is present and that the AC INPUT fuses have not blown. As charging begins, the battery forces the
unit into current limit. At this time the desired charging limit current can be readjusted with the front panel C. LIMIT ADJ potentiometer
(using the tool provided on the inside of the access door) while monitoring the front panel ammeter.
5.
When the charging current as indicated on the front panel ammeter falls to near zero, the battery is fully charged.
USING THE ALARM OUTPUT
The isolated internal relay contacts are connected to the Battery Charger terminals as follows: NC (normally closed contact to ALARM OPEN
terminal, NO (normally open) to ALARM CLOSED terminal and relay common to ALARM ARMATURE terminal. If the Battery Charger fails,
the circuit between ALARM ARMATURE and ALARM OPEN opens, and the circuit between ALARM ARMATURE and ALARM CLOSED
closes. The outputs from the form “C” relay can be used to alert other equipment, a computer, or an operator about a Battery Charger failure
(overvoltage, internal overcurrent, overtemperature, fan failure or low output current (<1% maximum current limit).
USING REMOTE ON-OFF CONTROL
To use remote ON-OFF control first remove the jumper between ±RC terminals. Then connect an external NC relay contact or d-c voltage
(see Table 1 for specifications) across ±RC terminals to turn the output on or off. A short or low voltage turns the output on; An open circuit or
high voltage turns the output off.
IV — SPECIFICATIONS
Specifications listed in Table 1 are at nominal input voltage and at 25°C unless otherwise specified.
TABLE 1. KES 48 VOLT SPECIFICATIONS
SPECIFICATION
RATING
DESCRIPTION/CONDITION
KES 48-5
KES 48-10
KES 48-25
Input Voltage
100V a-c to 240V a-c
Nominal
85V a-c to 265V a-c
Range
50Hz/60Hz
(1)
Nominal Frequency
47Hz to 66Hz
(1)
Frequency Range
(1)
KES units can operate with source power frequency up to 400Hz nominal (range to 440Hz). Power factor, efficiency and leakage current will derate as frequency
increases. Consult factory for additional information.
