Motor Thermal Protection; Ac Mains Connection; Mains Connection; External Fan Supply - Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual

Electrical Installation
If found to be 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
4 4
•
Use a dU/dt or sinus filter

4.6.6 Motor Thermal Protection

The electronic thermal relay in the frequency converter has
received UL-approval for single motor protection, when
1-90 Motor Thermal Protection is set for ETR Trip and
1-24 Motor Current is set to the rated motor current (see
the motor name plate).
For thermal motor protection, it is also possible to use the
MCB 112 PTC Thermistor Card option. This card provides
ATEX certificate to protect motors in explosion hazardous
areas, Zone 1/21 and Zone 2/22. When 1-90 Motor Thermal
Protection, set to [20] ATEX ETR, is combined with the use
of MCB 112, it is possible to control an Ex-e motor in
explosion hazardous areas. Consult the Programming Guide
for details on how to set up the frequency converter for
safe operation of Ex-e motors.

4.7 AC Mains Connection

4.7.1 Mains Connection

Mains must be connected 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 No.
91, 92, 93
94
Table 4.6 Terminal Functions
Ensure that the power supply can supply the necessary
current to the frequency converter.
If the unit is without built-in fuses, ensure that the
appropriate fuses have the correct current rating.
32
Operating Instructions
Function
Mains R/L1, S/L2, T/L3
Ground
Danfoss A/S © Rev. 2014-01-22 All rights reserved.

4.7.2 External Fan Supply

If the frequency converter is supplied by DC or the fan
must run independently of the power supply, use an
external power supply. Make the connection on the power
card.
Terminal No. Function
100, 101 Auxiliary supply S, T
102, 103 Internal supply S, T
Table 4.7 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
power supply is needed, remove the jumpers and connect
the supply to terminals 100 and 101. Protect with a 5 A. 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,
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
electrical noise back onto the power grid. Isolate control
wiring from high-voltage power wiring.
MG21B202