Application guidelines
37
FRCC.PC.023.A7.22
Single compressors
Electrical data, connections and wiring
Wiring & EMC protection
The motor compressor power supply from
the CDS303 frequency converter to the VZH
compressor must be done with a braided
screened / armored cable. This cable needs to
have its screen / armor conduit connected to
earth on both ends. Avoid terminating this cable
connection with twisting ends (pigtails) because
that would result in an antenna phenomena and
decrease the effectiveness of the cable.
Control cables to the CDS303 frequency
converter must use the same installation
principles as the power supply cable.
The motor compressor cable must be installed in
a conduit separated from the control and mains
cables.
Physical installation of the frequency converter
on the mounting plate must ensure good
electrical contact between the mounting plate
and the metal chassis of the converter. Use star-
washers and galvanically conductive installation
plates to secure good electrical connections.
Refer to instructions MG34M302 for tightening
torques and screw sizes.
Note that the CDS303 must be mounted on a
plain wall to ensure a good air flow through its
heat exchanger.
From network to frequency converter
From frequency converter to compressor
Type
in²
AWG
Type
in²
AWG
200 - 240 V
CDS-15kW
0.04
4
VZH088-J
0.04
4
CDS-18.5 kW
0.05
2
VZH117-J
0.05
2
CDS-22 kW
0.08
1
VZH170-J
0.08
1
380 - 400 V
CDS-15 kW
0.009
10
VZH088-G
0.009
10
CDS-18.5 Kw
0.015
8
VZH117-G
0.015
8
CDS-22 kW
0.025
6
VZH170-G
0.025
6
525 - 600 V
CDS-18.5 kW (IP20)
0.015
8
VZH088-H
0.009
10
CDS-30kW (IP20)
0.04
4
VZH117-H
0.015
8
CDS-30kW (IP20)
0.04
4
VZH170H
0.025
6
Wire sizes
Below table lists recommended wiring sizes for the motor compressor power supply cables. These
wiring sizes are valid for a cable length up to 65 ft.
from network
to drive
from drive to
to compressor
