Micro
ARE-M Series 24V Chargers, Single Phase
Setup and Operation
PM990-1070-24, Issue 12
4-10
Note:
Lead-calcium alloy grid batteries do not require regular equalizing.
Set the equalization voltage to equal the float voltage.
Low Voltage Alarm (LVA)
Set the LVA alarm to a voltage that, if charger output voltage falls below this setting, an alarm will be
annunciated.
High Voltage Alarm (HVA)
Set the HVA alarm to a voltage that, if charger output voltage goes above this setting, an alarm will be
annunciated.
High Voltage Shutdown Voltage (HVSD)
Set the HVSD alarm to a voltage that, if charger output voltage goes above this setting, the charge will
shutdown.
High Voltage Shutdown Reset
Press the SEL on the keypad to reset the HVSD.
NOTE: The charger voltage must drop below the HVSD set voltage. In addition if the hardware
overvoltage protection has been engaged, two methods can be used to reset the hardware. The first is to
remove the wiring harness (J5) from the interface board for 5 seconds, then replace. The second method
is to physically disconnect the battery from the charger.
Low Current (No Charge) Alarm (NCA)
Set the NCA alarm to a current that, if charger output current falls below this setting an alarm will be
annunciated.
Ground Detection Alarm (GND) - Two pole DC breaker models only
Gives a +GND or –GND alarm when the resistance between the charger output and ground, is below the
set point. The Ground Alarm resistance is adjustable. High resistance values are for a very sensitive
detection, low values are for less sensitive detection. The ground fault resistance and fault voltages can
be monitored using the “Ground Fault Resistance” and “Ground Fault Voltages” submenus as shown in
Fig. 4-2.
The resistance value displayed for the set point is the resistance that the system will detect from one
output pole to earth with no other current paths from output to earth. The presence of other current paths,
intentional or not, can affect the operation of the alarm. Intentional current paths on the output of the unit
may be external ground detection systems or ground reference connections in loads. Unintentional
current paths may be leakage currents over the battery cases, conductive pollution accumulation on
connections, or moisture on cables and connections.
If you have nuisance ground alarm indication and there are no intentional current paths and there are not
faults on the DC system (battery, charger, loads, and all interconnecting dc cabling), and all equipment is
properly grounded, you may lower the sensitivity of the detection to eliminate the nuisance alarm. If the
system has external ground detection, the ground alarm on the charger may be disabled. If the charger’s
ground detection circuitry is interfering with the external ground detection, the optional ground detection
switch may be turned off. (The optional ground detection switch is a factory-installed option.)
NOTE: See section 7.6 for ground detection switch options.
