Ac Mains Connection; Mains Connection; External Fan Supply; Power And Control Wiring For Unscreened Cables - Danfoss VLT Refrigeration Drive FC 103 Operating Instructions Manual

Electrical Installation
•
Use an insulated bearing.
•
Apply rigorous installation procedures.
•
Ensure that the motor and load motor are
aligned.
•
Strictly follow the EMC installation guideline.
•
Reinforce the PE so the high frequency
impedance is lower in the PE than the input
4 4
power leads.
•
Provide a good high frequency connection
between the motor and the frequency converter.
•
Ensure that the impedance from frequency
converter to building ground is lower than the
grounding impedance of the machine. Make a
direct ground connection between the motor and
load motor.
•
Apply conductive lubrication.
•
Balance the line voltage to ground.
•
Use an insulated bearing as recommended by the
motor manufacturer.
NOTICE
Motors from reputable manufacturers typically have
insulated bearings as standard in motors of this size.
If necessary, and after consultation with Danfoss:
•
Lower the IGBT switching frequency.
•
Modify the inverter waveform, 60° AVM vs.
SFAVM.
•
Install a shaft grounding system or use an
isolating coupling between motor and load.
•
Use minimum speed settings if possible.
•
Use a dU/dt or sine-wave filter.

4.7 AC Mains Connection

4.7.1 Mains Connection

Connect mains to terminals 91, 92, and 93 on the far left
of the unit. Ground is connected to the terminal on the
right of terminal 93.
Terminal
number
91, 92, 93
94
Table 4.5 Terminal Functions
Ensure sufficient current supply to the frequency converter.
If the unit is without built-in fuses, ensure that the
appropriate fuses have the correct current rating.
40
VLT
Function
Mains R/L1, S/L2, T/L3
Ground
Danfoss A/S © 08/2015 All rights reserved.
®
Refrigeration Drive FC 103 Low Harmonic Drive

4.7.2 External Fan Supply

NOTICE
Applicable for E and F enclosures only.
If the frequency converter is supplied by DC, or the fan
must run independently of the supply, use an external
supply. Make the connection on the power card.
Terminal
number
100, 101
102, 103
Table 4.6 Terminal Functions
The connector on the power card provides the connection
of line voltage for the cooling fans. The fans are connected
from the factory to be supplied from a common AC line
(jumpers between 100–102 and 101–103). If external
supply is needed, remove the jumpers and connect the
supply to terminals 100 and 101. Protect with a 5 A fuse.
In UL applications, use a LittelFuse KLK-5 or equivalent.
4.7.3 Power and Control Wiring for
Unscreened Cables
WARNING
INDUCED VOLTAGE
Induced voltage from coupled output motor cables
charges equipment capacitors even with the equipment
turned off and locked out. Run motor cables from
multiple frequency converters separately. Failure to run
output cables separately could result in death or serious
injury.
CAUTION
COMPROMISED PERFORMANCE
The frequency converter runs less efficiently if wiring is
not isolated properly. To isolate high frequency noise,
place the following in separate metallic conduits:
•
Power wiring
•
Motor wiring
•
Control wiring
Failure to isolate these connections could result in less
than optimum controller and associated equipment
performance.
Because the power wiring carries high-frequency electrical
pulses, it is important to run input power and motor
power in separate conduit. If incoming power wiring is in
the same conduit as motor wiring, these pulses can couple
Function
Auxiliary supply S, T
Internal supply S, T
MG16N102