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NetSure™ ACU+ Controller (Advanced Control Unit Plus)
User Instructions, UM1M820BNA (Issue L, December 11, 2014)
Table 2.
Available Logical Components
Logical Component
Logic NOT
Logic OR
Logic AND
Description
NOT; Returns the inverted value of the input signal/parameter.
OR; Returns active (true) if any of the two signals/parameters are active (true).
AND; Returns active (true) if both of the two signals/parameters are active (true).
AndOr
XOR; Returns active (true) if one and only one of the two signals/parameters are active (true).
Greater Than (>)
GREATER THAN; Returns active (true) if the analog input signal goes above the set threshold.
Returns inactive (false) if the input signal goes below the set threshold minus hysteresis
value.
Less Than (<)
LESS THAN; Returns active (true) if the analog input signal goes below the set threshold.
Returns inactive (false) if the input signal goes above the set threshold plus hysteresis value.
Delay
DELAY in seconds; Delays the applied signal/parameter with the defined time in seconds
before applying it to the output.
This is a fail-safe logic to ensure generator operation in all cases
where power or control to the relay is lost.
General
Hybrid Control allows the option of selecting one of the following:
Fixed Daily Time based operation or Capacity Discharge based
operation.
Further to that, the type of signal to the generator can be selected
as N/O (Normally Open) or N/C (Normally Closed) by selecting the
relevant output pins of the control relay.
Fixed Daily Time based operation is intended to be used with a
combination of AC powered active cooling (air conditioners) and
DC powered cooling (heat exchangers, etc.). The cycle period is
synchronized to the 24hr day-night cycle. It makes optimum use
of the different temperature conditions during the day and the
night in order to facilitate Hybrid fuel saving operation.
Number of Generator Control Outputs: The ACU+ Hybrid software
can control one or two generators. Each generator control is
designated as DG1 or DG2 output. A User selectable menu will
allow selecting DG1, DG2, or DG1 and DG2. When both are
selected they will be alternatively used (two generator operation).
Capacity Discharge based operation is intended for sites utilizing
only DC powered cooling (heat exchangers, etc.). The cycle period
is determined by User selectable depth of discharge (DOD) of the
batteries per cycle and associated recharge time. It provides
optimum Hybrid fuel saving operation.
Diesel Fail Alarm: A diesel fail alarm will be generated if the Diesel
Generator ON signal fails to bring the generator to operation and
provide the system with AC power. Alarm will be triggered after
60 seconds (default value, settable) from ON signal. If two
generator operations are selected simultaneously with the alarm,
the second Diesel Generator ON signal will be activated.
Operation from Grid Power is performed with both Fixed Daily
Time and Capacity Discharge modes of operation. Grid power is
always given priority when available.
Battery Fuse Trip Alarm: In the event of a Battery Fuse trip
condition an alarm will be generated.
As the two types of control are specific to the hardware
configuration of the site, the Fixed Daily Time or Capacity
Discharge is a User selectable option on installation.
Under Voltage Alarms:
Hybrid Operation
Generator Control: Potential free relay contact output from the
ACU+ interface board controls the start and stop of the diesel
generator. The signal is generated by the ACU+ Controller and
operates according to the Hybrid software mode of operation. The
control logic is as follows:
•
Energized output relay – Generator OFF.
•
De-energized output relay – Generator ON.
Spec. No: 1M820BNA, 1M820DNA
Model No: M820B, M820D
•
Under Voltage Alarm 1: An Under Voltage Alarm 1 is set.
If voltage decreases below this setting, an alarm is raised.
•
Under Voltage Alarm 2: An Under Voltage Alarm 2 is set.
If voltage decreases below this setting, the Diesel
Generator is started and an alarm is raised.
LVD 1: Normal loads are disconnected.
LVD 2: Priority loads are disconnected.
Charge Voltage: Refer to Figure 6.
8
Code: UM1M820BNA
Issue L, December 11, 2014