Optidrive HVAC User Guide V2.00
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www.invertekdrives.com
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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 Optidrive 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 Optidrive 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 bus-bar 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 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.
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
