Exide Technologies JA5009-00 - Manual (Page 24)

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15. CURRENT LIMIT ALARM RELAY W/INDICATOR LIGHT (EJ0137)
Purpose: The Current Limit Alarm provides an alarm signal whenever the battery charger output reaches
the maximum limit set by the current limit circuit. An indicator lamp (DS24) mounted on the instrument
panel also lights when the current limit alarm is activated.
Description: The CLA PC Board assembly (A18) continually monitors the output of the current limit
circuit on the charger control module (A1). When the current limit circuit indicates that the charger output is
in current limit, the circuitry of A18 closes a relay (K24). This provides an alarm condition at terminals 25,
26 & 27 of TB3. A several second delay is built into A18 so that brief excursions into current limit caused
by load changes will not result in an erroneous alarm indication. When the battery charger comes out of
current limit, the alarm will be automatically reset.
16. CABINET HEATER STRIPS (EJ0145)
Purpose and Description: This option provides a method of maintaining a dry charger interior in high
humidity environments. Strip heaters (R68x), placed inside the charger cabinet, are physically shielded to
prevent accidental human contact. A customer-supplied 120 Volt single-phase source provides power for
this option, and is separate from the charger circuit. This customer power source, protected by circuit
breaker (CB6), is connected to terminal block (TB6) located inside the charger enclosure. The cabinet
heaters are "ON/OFF" type, and are controlled by a fixed thermostat (TH1). The thermostat opens on a rise
to approximately 80° F and resets (re-closes) at approximately 70° F.
17. HIGH / LOW AC VOLTAGE ALARM RELAYS WITH INDICATOR LIGHTS (EJ0155)
Purpose: The HLAC Alarm relay provides an indication whenever the AC input voltage deviates
beyond preset limits. The factory-set limits are 115% (high alarm) and 85% (low alarm) of the nominal AC
input voltage. Indicator lights on the battery charger front panel are provided for each condition.
Description: The HLAC Alarm relay operates similarly to the High-Low DC voltage alarm relay. An
AC Detector PC Board assembly (A11B) converts AC voltage to DC voltage. An Alarm PC Board assembly
(A11A) measures this filtered signal from A11B. If the measured signal is not within an acceptable range, an
alarm condition is provided at terminals 38, 39 & 40 (High ACV) and 41, 42 & 43 (Low ACV) of TB3.
Corresponding indicator lamps (DS18/DS17) are lighted on the instrument panel. A11A has a built-in delay
to prevent line voltage surges and sags from causing erroneous alarm indications. When the AC line returns
to within acceptable limits, the alarm indications will be reset.
18. OVER-TEMPERATURE ALARM RELAY (EJ0439) - WITH BUZZER OR INDICATOR LIGHT
Purpose: The Over-Temperature Alarm provides an alarm indication whenever the battery charger
internal components become overheated for any reason. This feature is standard on all battery chargers rated
over 300 ADC.
Description: A built-in audible alarm (DS19) is furnished, along with alarm contacts at TB3 terminals
47, 48 & 49. A normally open thermostat (TH2) is mounted on one or more of the heat-sensitive
components of the charger. If an over-temperature condition occurs, the thermostat closes the circuit to
DS19 and the alarm relay (K18). The audible alarm may be turned off with a switch (SW17) mounted inside
the charger enclosure. When the internal component temperature returns to an acceptable value, the alarm
relay is automatically reset. SW17 should then be returned to the normal position.