Flooded Type Water Cooled Screw Chiller Technical M
anual
27
3
．
Permissible tolerance of source voltage is ±10% and unbalance of phase voltage is less than
2.25%.
%
100
voltage
average
voltage
average
-
e
Max.voltag
ratio
unbalance
voltage
×
=
4.2 Wiring Requirements
Carrying capacity of supply power cord should be higher than max operating current of unit and
takes impact of working environment into account. As for unit using duplex power supply, diameter
of two power cords should be the same.
Wiring for user is as follows:
1
．
Three-phase power supply respectively uses yellow, green, red, light blue and yellow/green
wire corresponding to L1, L2, L3, N and PE.
2
．
Communication line shouldn’t tightly rely on power cord or be laid parallel with power cord.
3
．
Confirm phase sequence of power cord when installing power cord. Firmly press connection
terminal, then connect it to power supply terminal of unit. It is must be tightened, otherwise,
disastrous results such as unit failure or even fire hazard will be caused by superheat.
4
．
After installing power cord, it is a must to carefully check according to wiring diagram and
supply power after ensuring correct wiring.
5
．
Grounding requirements
Unit must be reliably grounded and wire of earth line is usually selected according to the
following requirements:
