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Users Manual & Installation Guide
PV- 5127: Power supply module with UPS
Page 20 of 31
Battery monitor and charger
Battery voltages
The PV-5127 monitors the voltage of the battery as long as the main DC/DC converter is on. The
voltage status controls the charger, the RS232 alarm output, the battery LED, and it can be read
through PC/104. The possible ranges are:
Range Thresholds
Empty
Below 9.5V
Low
Between 9.5V and (10.75V, 11.25V)
Medium
Between (10.75V, 11.25V) and (13.0V, 14.7V)
Full
Between (13.0V, 14.7V) and 15.0V
Disconnected
Above 15.0V
There is hysteresis when moving between some of the ranges. The notion (10.75V, 11.25V)
denotes the lower and upper hysteresis levels, so that the change from low to medium happens when
the voltage rises above 11.25V, but to change from medium to low, the voltage must drop below
10.75V.
When empty, and running on battery, power is immediately turned off to protect the battery against
complete discharge. This is the safety shutdown feature. Empty can also mean that no battery is
connected.
When low, and running on battery, a Critical alarm is reported through RS232.
The medium and full ranges control the charging mode, see below.
The disconnected state happens when the charger is on, and there is no battery connected.
Lead-acid charger
The PV-5127 has an integrated lead-acid battery charger that will maintain the UPS battery as long
as the mains voltage is present. The battery charger has three modes of operation: Fast charge,
trickle charge, and off.
In the fast charge mode, the battery charger will deliver a constant current to the battery as long as
the battery voltage has not reached 14.7V. This current can be programmed by a jumper at ST1.
ST1 installed ST1 removed
Fast charge current=1A Fast charge current=0.5A
After reaching 14.7V, the charger goes into trickle charge mode. In this mode, the battery is
supplied with a constant voltage of 13.6V. When the battery voltage falls below 13.0V, the charger
returns to fast charge mode.
Charging a lead-acid battery while it is too hot may damage it. The PV-5127 has an input, J1, for
connecting an external battery temperature sensor. The sensor, if used, should be physically