Motor Connection - Invertek Compact 2 Series User Manual

5.3.2. Fuse / Circuit Breaker Selection

Suitable fuses to provide wiring protection of the input power cable should be installed in the incoming supply line, according to the data in
section 11.10 Electrical Rating Tables on page 50. The fuses must comply with any local codes or regulations in place. In general, type gG (IEC
60269) or UL type J fuses are suitable; however in some cases type aR fuses may be required. The operating time of the fuses must be below
0.5 seconds.

Where allowed by local regulations, suitably dimensioned type B MCB circuit breakers of equivalent rating may be utilised in place of fuses,
providing that the clearing capacity is sufficient for the installation.

The maximum permissible short circuit current at the Optidrive Power terminals as defined in IEC60439-1 is 5kA.
5.3.3. Optional Input Choke

An optional Input Choke is recommended to be installed in the supply line for drives where any of the following conditions occur:-
o The incoming supply impedance is low or the fault level / short circuit current is high
o The supply is prone to dips or brown outs
o An imbalance exists on the supply (3 phase drives)
o The power supply to the drive is via a busbar and brush gear system (typically overhead Cranes).

In all other installations, an input choke is recommended to ensure protection of the drive against power supply faults. Part numbers are
shown in the table.

5.4. Motor Connection


The drive inherently produces fast switching of the output voltage (PWM) to the motor compared to the mains supply, for motors which have
been wound for operation with a variable speed drive then there is no preventative measures required, however if the quality of insulation is
unknown then the motor manufacturer should be consulted and preventative measures may be required.

The motor should be connected to the Optidrive U, V, and W terminals using a suitable 3 or 4 core cable. Where a 3 core cable is utilised,
with the shield operating as an earth conductor, the shield must have a cross sectional area at least equal to the phase conductors when they
are made from the same material. Where a 4 core cable is utilised, the earth conductor must be of at least equal cross sectional area and
manufactured from the same material as the phase conductors.

The motor earth must be connected to one of the Optidrive earth terminals.
5.5. Motor Terminal Box Connections
Most general purpose motors are wound for operation on dual voltage supplies. This is indicated on the nameplate of the motor. This operational
voltage is normally selected when installing the motor by selecting either STAR or DELTA connection. STAR always gives the higher of the two
voltage ratings.
Incoming Supply Voltage
5.6.
EMC Compliant Installation
Category Supply Cable Type
6 1
C1 Shielded
2
C2 Shielded
3
C3 Unshielded
1/ A screened (shielded) cable suitable for fixed installation with the relevant mains voltage in use. Braided or twisted type screened cable where
the screen covers at least 85% of the cable surface area, designed with low impedance to HF signals. Installation of a standard cable within a
suitable steel or copper tube is also acceptable.
2/ A cable suitable for fixed installation with relevant mains voltage with a concentric protection wire. Installation of a standard cable within a
suitable steel or copper tube is also acceptable.
3/ A cable suitable for fixed installation with relevant mains voltage. A shielded type cable is not necessary.
4/ A shielded cable with low impedance shield. Twisted pair cable is recommended for analog signals.
5/ The cable screen should be terminated at the motor end using an EMC type gland allowing connection to the motor body through the largest
possible surface area. Where drives are mounted in a steel control panel enclosure, the cable screen may be terminated directly to the control
panel using a suitable EMC clamp or gland, as close to the drive as possible.
6/ Compliance with category C1 conducted emissions only are achieved. For compliance with category C1 radiated emissions, additional
measures may be required, contact your Sales Partner for further assistance.
7/ Permissible cable length with additional external EMC filter.
16
Optidrive Compact-2 Engineering Guide Issue 07.docx
Supply Frame Size
230 Volt, 1 Phase
400 Volt, 3 Phase
Motor Nameplate Voltages
230 230 / 400
400 400 / 690
400 230 / 400
Motor Cable Type
1,5
Shielded
1, 5
Shielded
2
Shielded
www.invertekdrives.com
AC Input Inductor
1 OPT-2-L1016-20
1 OPT-2-L3006-20
2 OPT-2-L3010-20
Delta
Star
Control Cables
4
Shielded
Connection
Maximum Permissible Motor Cable Length
7
1M / 1M
7
3M / 3M
7
10M / 10M