Input Options; Extra Protection (Rcd); Rfi Switch; Screened Cables - Danfoss VLT Refrigeration Drive FC 103 Operating Instructions Manual

Electrical Installation
EN/IEC61800-5-1 (Power Drive System Product Standard)
requires special care if the leakage current exceeds 3.5 mA.
Grounding must be reinforced in 1 of the following ways:
•
Ground wire of at least 10 mm
•
2 separate ground wires both complying with the
dimensioning rules.
See EN 60364-5-54 § 543.7 for further information.
4 4

4.5 Input Options

4.5.1 Extra Protection (RCD)

ELCB relays, multiple protective grounding, or standard
grounding provide extra protection, if local safety
regulations are followed.
In the case of a ground fault, a DC component develops in
the fault current.
If using ELCB relays, observe local regulations. Relays must
be suitable for protection of 3-phase equipment with a
bridge rectifier and for a brief discharge on power-up.

4.5.2 RFI Switch

Mains supply isolated from ground
If the frequency converter is supplied from an isolated
mains source or TT/TN-S mains with grounded leg, turn off
the RFI switch via parameter 14-50 RFI Filter on both
frequency converter and the filter. For further reference,
see IEC 364-3. When optimum EMC performance is needed,
parallel motors are connected, or the motor cable length is
above 25 m, set parameter 14-50 RFI Filter to [ON].
In OFF, the internal RFI capacitors (filter capacitors)
between the enclosure and the DC link are cut off to avoid
damage to the intermediate circuit and reduce ground
capacity currents (IEC 61800-3).
Refer to the application note VLT on IT mains. It is
important to use isolation monitors that work together
with power electronics (IEC 61557-8).

4.5.3 Screened Cables

It is important to connect screened cables properly to
ensure high EMC immunity and low emissions.
Connection can be made using either cable glands or
clamps:
•
EMC cable glands: Generally available cable
glands can be used to ensure an optimum EMC
connection.
•
EMC cable clamp: Clamps allowing easy
connection are supplied with the unit.
38
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VLT Refrigeration Drive FC 103 Low Harmonic Drive

4.6 Motor Connection

4.6.1 Motor Cable

2 .
Connect the motor to terminals U/T1/96, V/T2/97, W/T3/98,
on the far right of the unit. Ground to terminal 99. All
types of 3-phase asynchronous standard motors can be
used with a frequency converter. The factory setting is for
clockwise rotation with the frequency converter output
connected as follows:
Terminal number
96, 97, 98
99
Table 4.2 Terminal Functions
•
•
•
The direction of rotation can be changed by switching 2
phases in the motor cable or by changing the setting of
parameter 4-10 Motor Speed Direction.
To check motor rotation, select parameter 1-28 Motor
Rotation Check and follow the steps on the display.
Danfoss A/S © 08/2015 All rights reserved.
Function
Mains U/T1, V/T2, W/T3
Ground
Terminal U/T1/96 connected to U-phase.
Terminal V/T2/97 connected to V-phase.
Terminal W/T3/98 connected to W-phase.
MG16N102