3-4
CDA3000 Operation Manual
3 Electrical installation
3.3 Motor
connection
Step Action Comment
1
Define the wire cross-section depend-
ent on the maximum current and ambient
temperature.
Wire cross-section as per
VDE0100, part 523, see section
3.4 "Mains connection".
2
Wire the motor phases U, V, W by way of
a shielded cable and ground the motor to
X1/
.
Mount shield at both ends to
reduce interference emission.
3
Wire the temperature sensor PTC
(if fitted) with separately shielded wires.
Mount shield at both ends to
reduce interference emission.
Figure 3.3 Connection of motor
Note the following points:
• Always use shielded cables to connect the motor.
• Shield contact on the inverter module:
− For inverter modules BG1 ... 5 (0.37 ... 15 kW) there is an
accessory shield (ST02, ST04 or ST05) permitting simple clip
mounting with all-round contact.
− For inverter modules BG6 ... 8 (22 ... 90 kW) we recommend
using a cable clamp rail with shield connection directly on the
cable gland in the switch cabinet.
• The motor at the inverter output may be shut off by means of a
contactor or motor circuit-breaker. The inverter module cannot be
damaged in the process. It may switch to Fault status, however, if a
switching voltage overload occurs when the motor is shut off. In
such cases a motor choke must be fitted.
• Multi-motor operation is possible; for project planning notes see
Appendix A.4.
The CDA3000 inverter
modules are short-cir-
cuit and earth fault
proof at the terminals
during operation. If an
earth fault or short-cir-
cuit occurs in the motor
cable, the power stage
is disabled and an error
message is sent.
X3
X1
U
V
W
M
3~
ϑ
1
V
2
U
W
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