Brochures and Data Sheets

NetSure
™
ACU+ Controller (Advanced Control Unit Plus)
User Instructions, UM1M820BNA (Issue AK, March 3, 2014)
Spec. No: 1M820BNA, 1M820DNA Code: UM1M820BNA
Model No: M820B, M820D Issue AK, March 3, 2014
9
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.
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.
For practical purposes, the battery capacity at the end of every
recharge period is set to 100% as long as Step1, Step 2, and Step 3
have elapsed.