User Guide Revision 1.12
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4.2.
Wiring Precautions
Connect the drive according to section 4.3 and 4.4, ensuring that motor terminal box connections are correct. There are two connections in
general: Star and Delta. It is essential to ensure that the motor is connected in accordance with the voltage at which it will be operated. For
more information, refer to section 4.5 Motor Terminal Box Connection.
It is recommended that the power cabling should be 4-core PVC-insulated screened cable, laid in accordance with local industrial regulations
and codes of practice.
4.3.
Incoming Power Connection
For a single phase supply, power should be connected to L1/L, L2/N.
For 3 phase supplies power should be connected to L1, L2, and L3. Phase sequence is not important.
For compliance with CE and C Tick EMC requirements, a symmetrical shielded cable is recommended.
A fixed installation is required according to IEC61800-5-1 with a suitable disconnecting device installed between the drive and the AC
Power Source. The disconnecting device must conform to the local safety code / regulations (e.g. within Europe, EN60204-1, Safety
of machinery).
The cables should be dimensions according to any local codes or regulations. Guideline dimensions are given in section13.4.
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 13.4. The fuses must comply with any local codes or regulations in place. In general, type gG (IEC 60269) or UL type T
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.
When the power supply is removed from the drive, a minimum of 30 seconds should be allowed before re-applying the power. A
minimum of 10 minutes should be allowed before removing the terminal covers or connection.
The maximum permissible short circuit current at the drive Power terminals as defined in IEC60439-1 is 100kA.
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. Refer to your
local Invertek sales partner for available options
Optidrive HVAC models in frame sizes 4 to 8 are factory fitted with an Input choke as standard.
4.4.
Drive and Motor Connection
The motor should be connected to the drive 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 drive earth terminals.
For compliance with the European EMC directive, a suitable screened (shielded) cable should be used. 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 are
recommended as a minimum. Installation within a suitable steel or copper tube is generally also acceptable.
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.
For IP55 drives, connect the motor cable screen to the internal ground clamp
Summary of Contents for HVAC H2
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