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www.fptgroup.com
HVAC
Installation & Operating Instructions
Page 16
4.2. Wiring Precautions
Connect the Fenner QD:HVAC 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 Connections.
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 Fenner 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 Fenner
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:-
•
The incoming supply impedance is low or the fault
level / short circuit current is high
•
The supply is prone to dips or brown outs
•
An imbalance exists on the supply (3 phase drives)
•
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 Fenner Authorised Distributor
for available options
•
Fenner QD: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 Fenner 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
