External Water Setpoint Reset - Electrical Wiring (Optional); Unit Limitation - Electrical Wiring (Optional); Fig. 5- User Connection To The Interface Terminal Board - Daikin EWWQ380B-SS Installation, Operation And Maintenance Manual

External water Setpoint reset – Electrical wiring (Optional)
The machine's local setpoint can be modified by means of an external analogue 4-20 mA signal. Once this function has
been enabled, the microprocessor allows to modify the setpoint from the set local value up to a differential of 3°C. 4 mA
corresponds to a 0°C differential, 20 mA corresponds to the setpoint plus the maximum differential.
The signal cable must be directly connected to terminals 35 and 36 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not to induce
interference with the electronic controller.
Unit limitation – Electrical wiring (Optional)
The machine's microprocessor allows to limit the capacity by means of two separate criteria:
- >Load limitation: The load can be varied by means of a 4-20 mA external signal from a BMS.
The signal cable must be directly connected to terminals 36 and 37 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not
to induce interference with the electronic controller.
Current limitation: The machine's load can be varied by means of a 4-20 mA external signal from an external
-
device. In this case, current control limits must be set on the microprocessor so that the microprocessor
transmits the value of the measured current and limits it.
The signal cable must be directly connected to terminals 36 and 37 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not
to induce interference with the electronic controller.
A digital input allows to enable the current limitation at the desired time. Connect the enabling switch or the
timer (clean contact) to terminals 5 and 9.
Attention: the two options cannot be enabled simultaneously. Setting one function excludes the other.
Fig. 5– User connection to the interface terminal board
1S Compressor Status 1
2S Compressor Status 2
Al Analog Inputs
AO Analog Output
C-3W Condenser 3-Way Valve
C.L. Current Limit
CFS Condensator Flow Switch
CLE Current Limit Enable
CP-VFD Condenser Pump VFD
D.L. Demand Limit
DI Digital Inputs
LEGEND
PS
Q10
S.O.
TW1
TW2
TW3
TW4
Power Supply
Main Switch
Setpoint Override
Tower 1 Fan Step
Tower 2 Fan Step
Tower 3 Fan Step
Tower 4 Fan Step
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