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User Instructions UM1M820BNA
Spec No. 1M820BNA (Model M820B) Issue AH, March 4, 2013
Spec No. 1M820DNA (Model M820D)
Chapter 1. Introduction 13
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Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.
Early Termination of the Discharge Periods
During discharge, over temperature and under voltage conditions will interrupt the discharge and
change the operation to charge – Diesel Generator ON.
Over Temperature: The diesel generator will start and run for a period before it is stopped again. The run
time is User selectable in the range 30 to 120 minutes, default setting is 60 minutes. Temperature is
referenced to cabinet/shelter ambient temperature sensor connected to the Controller, not battery
temperature. Over temperature start can be disabled completely from User settings menu.
Under Voltage: The under voltage start is triggered by under voltage alarm 2 voltage settings.
The diesel generator will start and run until the normal recharge cycle is due to finish depending on
selected mode of operation.
Example for Fixed Daily Time: If the normal recharge cycle is from 7am until 7pm and under voltage has
started the diesel generator at 5:30am, the effective recharge will be from 5:30am until 7pm.
Example for Capacity Discharge: If this mode is selected, the recharge will terminate.
Operation with Grid Power
Grid power is always prioritized when available. If grid power becomes available during battery discharge,
the discharge cycle is terminated and recharge cycle is initiated. If grid power becomes available during
diesel generator operation, the diesel generator is switched OFF and operations continue on grid power.
Battery Recharge with Grid Power: Battery recharge with grid power can start from the beginning (case
of grid power becoming available during battery discharge) or can continue over from diesel generator
recharge depending on the timing. In both cases, the recharge process will follow the recharge profile
shown in Figure 6. If battery becomes fully recharged and grid power is still present, the operations will
continue to be powered from grid and no battery discharge will be initiated for the duration of grid
availability. In this case battery voltage will revert back to Float voltage.
Battery Discharge after Grid Failure: At the point of grid power failure, the battery capacity is unknown
as these events occur in random manner. For the purpose of maximizing the use of grid power and in
anticipation of grid power becoming available again, the Hybrid operation will continue with battery
discharge cycle. Discharge will continue until:
The preset discharge time elapses (Fixed Daily Time).
The preset DOD is reached (Capacity Discharge).
In both cases, the discharge can be terminated earlier as described in “Early Termination of the Discharge
Periods”.
Relay Assignment – when in Hybrid Mode
Relay 1: Generator Alarm
No Generator Voltage Alarm. No AC supply, 60 sec delay.
Relay 2: Battery Alarms
Logic alarm generated from: under voltage 1, under voltage 2, LVD1, LVD2, battery high temp,
battery very high temp, overvoltage 1, overvoltage 2, battery temp sensor fail, battery fuse alarms,
and high load alarm.
Relay 3: Rectifier Alarms
Logic alarm generated from: multiple rectifier fail, rectifier fail, rectifier fan failure, rectifier HVSD,
rectifier AC failure, and rectifier not responding.