Exide Technologies JA5009-00 - Manual (Page 22)

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8. COMMON ALARM BUZZER (EJ0123)
Purpose: The Common Alarm Buzzer is a charger mounted audible alarm, which is activated when any
of several different alarm circuits goes into an alarm state.
Description: This circuit simply utilizes a set of contacts on each separate alarm relay. All of the
contacts are wired in parallel and connect the audible alarm (AU1) to the battery voltage. If any set of
contacts closes the alarm sounds. A switch (SW13) is provided to turn off the audible alarm if desired.
9. COMMON ALARM RELAY (EJ0141) - WITH OPTIONAL BUZZER
Purpose: The Common Alarm Relay circuit provides an alarm indication via relay contacts and optional
buzzer when any one of the alarm circuits being monitored goes into its alarm state.
Description: The individual alarm contacts, that are closed when in the non-alarm condition, are wired
in a series loop configuration with the common alarm relay and its DC source. If one of the alarm circuits
activates, its relay contact will open and de-energize the common alarm relay providing a common alarm
condition. One set of contacts of the common alarm relay is connected to the remote alarm terminal strip
(TB3) at terminals 28, 29 & 30. If the optional buzzer (AU1) is required, an additional set of contacts is used
to activate it. A switch (SW13) is provided to turn off the optional audible alarm if desired.
10. MANUAL FLOAT / EQUALIZE SWITCH WITH INDICATOR LIGHTS (EJ0093)
Purpose: Front panel lights indicate whether the charger is in a FLOAT or EQUALIZE charging mode.
Description: A double-pole, double-throw switch (SW7) is substituted for the normal
"FLOAT/EQUALIZE" switch (SW1). The second section of SW7 is wired to provide voltage to the proper
instrument panel light to denote the "FLOAT" or "EQUALIZE" position of SW7.
11. PARALLEL CHARGER OPERATION WITH 2% FORCED LOAD SHARING (EJ0133)
Installation: Using the interconnection cable supplied with the charger equipment, interconnect charger
"A" and charger "B" via the load share signal terminal block (TB4) as shown on EJ0133 on page 42. Also
refer to any instructions supplied with the manual for the option. DC load cables to be provided by the user.
Purpose: This option permits connecting two battery chargers in parallel to a common battery bank/load
in order to increase the total load capability or to provide redundancy for system reliability.
Description: The principle of operation is based on the ability to sense the current furnished by each
charger and to electronically force the two currents to be equal within a small percentage. Each individual
charger’s current is sensed by means of the shunt associated with the ammeter. The resultant voltages are
differentially amplified by the op-amp on each charger’s “paralleling” printed circuit board (A6). The output
of the op-amp in each charger is connected to the Control Module (A1) input. This output is combined with
the feedback signal from the front-panel "FLOAT" and "EQUALIZE" potentiometers (R3/R5). The net
effect is to adjust each charger so that the current furnished is sensed as being equal. The rectangular
potentiometer (R13) on the “paralleling” printed circuit board (A6) can be used to correct for any small
inequalities that may exist because of difference in shunts or system parameters.
Once the system is balanced, the two chargers will equally share any changes in the load. If either
charger is shut down or becomes inoperative, the other will assume the total load up to the point where its
current limit circuit operates. It is possible to operate each charger independently by setting the "LOAD
SHARE ON/OFF" switch (SW10) to the "OFF" position.