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UM1M820BNA User Instructions
Issue AH, March 4, 2013 Spec No. 1M820BNA (Model M820B)
Spec No. 1M820DNA (Model M820D)
14 Chapter 1. Introduction
This document is property of Emerson Network Power, Energy Systems, North America, Inc. and contains confidential and proprietary information owned by Emerson Network Power, Energy
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.
Relay 4: System Alarms
Logic alarm generated from: load fuse alarms, high ambient temperature, ambient temp sensor fail,
smoke detected, and water detection.
Relay 5: Generator Run At High Temp
Output to intelligent cooling devices linked to AC supply (DG run).
Relay 6: Intruder Alarm
Alarm triggered by dry contact door/motion sensor.
Relay 7: Diesel 1 in Operation
Output to DG1 on site. DG is set on for the duration of the signal.
Relay 8: Diesel 2 in Operation
Output to DG2 on site. DG is set on for the duration of the signal.
Fixed Daily
In this mode of operation the total duration of a complete cycle is 24hr. Such duration is necessary as the
operation is synchronized with day-night temperature pattern. When an extended recharge cycle is
required, the termination of it will still follow the 24hr schedule.
Cycle Duration: A complete cycle consists of discharge and charge periods to the combined total of
24hrs. The discharge period starts at 7pm. It is then followed by recharge period (Diesel Generator ON)
for the remaining of the 24hrs. The discharge time is User selectable in the range 1hrs to 22hrs, default
setting is 12hrs.
Discharge: The discharge start time and duration are settable. Discharge period starts at 7pm. The
discharge time is User selectable in the range 1hrs to 22hrs, default setting is 12hrs.
Recharge: Recharge period (Diesel Generator ON) follows after discharge for the remaining of the 24hrs.
Recharge is performed at equalize voltage until added equalize time elapses and at float voltage for the
remaining charge time.
High Load Alarm: In order to identify conditions where the load requirements are exceeding the
dimensioning of the Hybrid site, an alarm must be generated. The alarm will be triggered upon exceeding
the maximum capacity per discharge cycle. The threshold value will be set as default to 40% of battery
capacity. It will require capacity measurement per cycle. The alarm will be set once the high load threshold
value is reached and is reset at the beginning of the next discharge period. This alarm will also allow
distinguishing the root cause of under voltage conditions: is it high load demand or is it a battery ageing
and associated loss of capacity issue or insufficient charge capacity.
Capacity Discharge
The cycle period is determined by User selectable capacity discharge of the batteries and associated
recharge times. After that the cycle repeats itself. It does not follow a 24hr pattern.
Capacity Discharge and Recharge: The battery discharge period is determined by the percentage of
the nominal battery capacity [Ah] that will be discharged per cycle.
The depth of discharge [DOD] per cycle is User selectable in the range 20% to 80%. Default setting is
60%. The value is set as battery capacity at the end of each discharge period. Therefore, if a 60%
discharge is chosen, the discharge value is set to 40%.
The time to recharge to full battery capacity depends on battery capacity at the start of the charge cycle
and available recharge current.
When the additional charge time has been reached; the generator will be stopped, the recharge cycle will
end, and discharge cycle will be initiated.