NetSure
™
Control Unit (NCU)
User Manual, UM1M830BNA
Spec. No: 1M830BNA, 1M830DNA Code: UM1M830BNA
Model No: M830B, M830D Revision M, May 12, 2017
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
24hrs. This duration is necessary as the operation is synchronized
with day-night temperature pattern. When an extended recharge
cycle is required, its termination will still follow the 24hrs schedule.
Cycle Duration: A complete cycle consists of discharge and charge
periods during the combined total of 24hrs. The discharge period
starts at 7pm. It is then followed by recharge period (Diesel
Generator ON) for the remainder 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 1hours to 22hours, default setting is 12
hours.
Recharge: Recharge period (Diesel Generator ON) follows after
discharge for the remainder 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 will be generated. The alarm will be triggered when the
maximum capacity per discharge cycle is exceeded. 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 help the
User identify the root cause of the under voltage condition: high
demand load, the loss of capacity due to battery aging, or
insufficient charge capacity.
Capacity Discharge
The cycle period is determined by User selectable capacity
discharge of the batteries and associated recharge times. The
cycle repeats continuously. It does not follow a 24hrs 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 the 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.
If end of charge is not reached within the set maximum hours, the
recharge will be terminated and discharge cycle will be initiated.
MAXIMUM CURRENT LIMIT FUNCTION
The current available from the rectifiers can be limited (in AMPS)
from 10% to 121% of combined rectifier capacity. The factory
setting is 121% unless otherwise specified. The current available
from the converters can be programmed (in AMPS) from 50% to
116% of combined converter capacity. The factory setting is 116%
unless otherwise specified. Refer to the NCU Configuration
Drawing (C–drawing) supplied with your system documentation
for your system’s settings.
See also “Checking the Controller’s Current Limit Point after
Adding or Removing a Rectifier or Converter Module” on page 24.
To Next Page
Loading...
Need help?
General
