D-EOMWC00803-26_01EN - 38/39
7
OPTIONS
7.1
Energy Meter including Current Limit (Optional)
An energy meter can be optionally installed on the unit. The energy meter is connected through Modbus to the unit
controller, which can display all relevant electrical data such as:
•
Line to Line Voltage (per phase and average)
•
Line Current (per phase and average)
•
Active Power
•
Cos Phi
•
Active Energy
More details are described in chapter 5.2.2.1. All these data can be also accessed from a BMS by connecting it to a
communication module. See the communication module manual for details on the device and parameter settings.
Both the energy meter device and the unit controller need to be properly set. The instructions below detail how to set the
energy meter. Refer to the specific instructions of the energy meter for more detail on the operation of the device.
Energy Meter Settings (Nemo D4-L / Nemo D4-Le)
Password (Down+Enter) 1000
Connection
3-2E
three phase Aron System
Address
020
Baud
19.2
kbps
Par
None
parity bit
Time Out
3
sec
Password 2
2001
CT ratio
see CT label current transformer ratio (i.e if CT is 600:5, set to 120)
VT ratio
1
no voltage transformers (unless 690V chiller)
Once the energy meter has been configured, do the following steps in the unit controller:
•
From Main Menu, go to View/Set Unit
→
Commission Unit
→
Configuration
→
Unit
•
Set Energy Mtr = Nemo D4-L or Nemo D4-Le
The energy meter option integrates the current limit function, which allows the unit to limit its capacity in order not to exceed
a pre-defined current setpoint. This setpoint can be set in the unit display or can be changed from an external 4 -20 mA
signal.
The current limit must be set according to the following instructions:
•
From Main Menu, go to View/Set Unit
→
Power Conservation
The following settings related to current limit option are available into the menu:
Unit Current
Displays the unit current
Current Limit
Displays the active current limit (which can be given by an external signal if unit is in network mode)
Current Lim Sp
Set the current limit setpoint (if unit is in local mode)
7.2
Rapid Restart (Optional)
This chiller can activate a Rapid Restart (optional) sequence in reaction to a power failure. A digital contact is used to
inform the controller that the feature is enabled. The feature is configured in the factory.
Rapid restart is activated under the following conditions:
•
The power failure exists for up to 180 seconds
•
The unit and circuit switches are ON
•
No unit or circuit alarms exist
•
The unit has been running in the normal Run state
•
The BMS Chiller Enable setpoint is set to Enable when the control source is Network
If the power failure is more than 180 seconds, the unit will start based on the setting of the Stop -to-Start cycle timer
(minimum setting of 3 minutes) and load per standard unit without Rapid Restart.
When Rapid Restart is active, the unit will restart within 30 seconds of power restoration. The time to restore full load can
depend on system conditions and load.
