Product Manual

CU331SP variable frequency drive
SQ, SQE, CU 331, and SP
10
43
Protection against overcurrent
The CU331SP has an internal overcurrent protection
for overload protection on the motor output.
Protection against mains voltage transients
The CU331SP is protected against mains voltage
transients according to EN 61800-3, second
environment.
Mains and motor connection
The supply voltage and frequency are marked on the
CU331SP nameplate. Make sure that the CU331SP is
suitable for the power supply of the installation site.
The maximum output voltage of the CU331SP is equal
to the input.
Example: if the supply voltage is rated at 208V choose
a 208V motor for operation.
Mains switch
A mains switch can be installed before the CU331SP
according to local regulations. See fig. 32.
Wiring diagram
The wires in the terminal box must be as short as
possible. Excepted from this is the ground wire, which
must be so long that it is the last one to be
disconnected in case the cable is inadvertently pulled
out of the cable entry.
Fig. 32 CU331SP wiring diagram
For single-phase connection, use L1 and L2.
Mains connection
Check that mains voltage and frequency correspond to
the values on the nameplate of the CU331SP and the
motor.
1. Connect the ground wire to terminal 95 (PE). See
fig. 33.
2. Connect the power leads to the terminals 91 (L1),
92 (L2).
3. Fix the mains cable with a cable clamp.
Fig. 33 Mains connection
CU331SP drive is usable with 3-phase input power by
connecting leads to 91 (L1), 92 (L2), and 93 (L3).
Motor connection
The motor cable must be screened for the CU331SP to
meet EMC requirements.
1. Connect the ground wire to terminal 99 (PE). See
fig. 34.
2. Connect the motor leads to the terminals 96 (U), 97
(V), 98 (W).
3. Fix the screened cable with a cable clamp.
Fig. 34 Motor connection
The cable screen must be exposed and in physical
contact with the mounting plate and clamp.
TM05 5867 3912
Terminal Function
91 (L1)
Single-phase supply
92 (L2)
95/99 (PE) Ground connection
TM03 9020 2807