Stop Charge event
Before the battery reaches the limits of the operating specifications, the Stop Charge event is
triggered. When configured, this event forces the Mastervolt charger to switch to the float stage. The
charger will use a lower charger voltage or, in case of parallel connection, switch off. The event will
be active for 10 minutes.
Capacity Very Low event
A Capacity very low-alarm (built-in at 0% SoC by default) automatically triggers the safety relay.
When the alarm condition is corrected, reset the safety relay to resume normal operation.
If an alternator is part of the charging system, configure the Cap. very low-event. This pauses the
charging process until the alarm condition is corrected.
Battery safety event
PLEASE CAREFULLY READ THE FOLLOWING INFORMATION!
A battery safety event triggers the safety relay to automatically disconnect the battery from the loads
and charging devices. There are two kinds of battery safety events: a resettable and a non-
resettable.
• Resettable battery safety event
A resettable safety event occurs if the internal temperature of one of the individual cells exceeds
65°C / 149°F, or if the battery voltage level exceeds the minor minimum or maximum levels. See
chapter 17 for details.
This event is repeated every 60 seconds. It will only stop repeating if the battery voltage returns
and remains within specifications:
IF THE SAFETY RELAY HAS BEEN TRIGGERED:
1. On the MasterBus control panel, check that the voltage is within limits; higher than 10V (20V)
and lower than 15.5V (31V) and within temperature range; 0°C - 50°C / 32°F – 122°F.
2. If within limits, click the "Close relay" button on the MasterBus control panel. Start charging if
voltage is low (10V/20V) or discharging when high (15.5V/31V).
3. If the relay trips again, a non-resettable battery safety event occurred. Do not try to force or
reset the safety relay again! Isolate the battery and contact a Mastervolt representative.
• Non-resettable battery safety event
A non-resettable safety event occurs if the internal temperature of one of the individual cells
exceeds 75°C / 167°F, or if the voltage level exceeds the major minimum or maximum levels. See
chapter 17 for details.
WARNING!
IF A NON-RESETTABLE BATTERY SAFETY EVENT OCCURS: SET
THE SAFETY RELAY(S) TO “LOCK OFF”, SEE PAGE 11, AND
CONTACT A MASTERVOLT REPRESENTATIVE FOR ASSISTANCE.