Common Alarm Buzzer; Common Alarm Relay; Float And Equalize Indicating Lights; Parallel Charger Operation With Load Sharing - HindlePower SCR series Operating Instructions Manual

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 to the battery voltage. If any set of contacts
closes the alarm sounds. A switch 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 are connected to the remote alarm terminal strip,
TB3. If the optional buzzer is required, an additional set of contacts are used to activate it.
10. FLOAT AND EQUALIZE INDICATING LIGHTS (EJ0093-XX)
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 this new SW7 unit is wired to provide voltage to
the proper panel light to denote FLOAT or EQUALIZE position of SW7.
11. PARALLEL CHARGER OPERATION WITH LOAD SHARING (EJ0133-XX)
Installation: Using the interconnection cable supplied with the chargers, interconnect charger "A" and
charger "B" as shown on EJ0133, page 42. Also refer to any instructions that were supplied with the
option.
Purpose: The load sharing option permits connecting two battery chargers in parallel to a common
battery bank and/or load in order to increase the total load capacity, or to provide redundancy for system
reliability.
Description: The load sharing option senses the current provided by each charger, and electronically
forces the two currents to be equal within a small percentage. Each charger's output current is sensed by
the dc ammeter shunt. The signal voltages are differentially amplified by the operational amplifier on each
charger's load share circuit board, A6. The output of the load share board in each charger is connected to
the A1 Control Modules's input, and is combined with the feedback signal from the front-panel FLOAT
and EQUALIZE potentiometers. The net effect is to adjust each charger so that the current furnished is
sensed as being equal.
Current sharing is adjusted with R13 on the load share circuit board. The adjustment procedure may
require a dummy load. The user should refer to the Forced Load Share Field Installation Procedure,
JD0019.
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