Invertek Drives elevator CORE Quick Start-Up Manual page 15

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8.5. Cable Termination
The terminals are designed to accept the following termination methods (Bare conductor or Ferrule)
8.6. Power Supply Connections
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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).
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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 drive Power terminals as defined in IEC60439-1 is 100kA.
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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 5 minutes should be allowed before removing the terminal covers or connection.
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An optional Input Choke/Line reactor 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.
•
In all other installations, an input choke is recommended to ensure protection of the drive against power supply faults
8.7. Motor Connections
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The PWM output switching from any inverter when used with a long motor cable length can cause an increase in the voltage at the motor
terminals, depending on the motor cable length and inductance. The rise time and peak voltage can affect the service life of the motor.
Invertek Drives recommend using an output choke for motor cable lengths of 50m or more to ensure good motor service life.
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The motor must 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.
•
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.
•
Where drives are mounted in a steel control panel enclosure, the cable screen should be terminated directly to the control panel using a
suitable EMC clamp or gland, as close to the drive as possible and as illustrated in section 8.2 alternatively the optional EMC cable bracket
should be used as per shown in section 8.2.
8.8. Motor Contactors
Do not install any type of automatic switchgear between the drive and the motor which will change state whilst the drive is running, failure to
do so will likely result in damage to the contactors as well as nuisance drive errors.
The drive STO SIL3 Inputs can be used to replace the motor contactors according to parts of EN 81-20:2014 and EN 81-50:2014.
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It is recommended that the power cabling should be 4-core PVC-insulated screened cable and laid
in accordance with local industrial regulations and codes of practice.
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The cables should be dimensioned according to any local codes or regulations. Guideline
dimensions are given is section 6 Product Technical Information.
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Suitable fuses to provide wiring protection of the input power cable should be installed in the
incoming supply line, recommended ratings are given in section 6 Product Technical Information.. 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.
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There are sometimes multiple connections within the motor terminal box, 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.
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Maximum Motor cable length for shielded type cables is 100mtrs/330ft (150mtrs/495ft
for un-shielded cables).
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Note that the maximum motor cable length stated is the maximum permissible cable
length for the drive hardware and does not take into consideration EMC compliance.
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The motor earth must be connected to one of the drive earth terminals.
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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.
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