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
.
•
2 separate ground wires both complying with the
dimensioning rules.
See EN 60364-5-54 § 543.7 for further information.
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
Line power supply isolated from ground
If the adjustable frequency drive is supplied from an
isolated line power source or TT/TN-S line power with
grounded leg, turn off the RFI switch via
parameter 14-50 RFI 1
on both adjustable frequency drive
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 82 ft [25
m], set
parameter 14-50 RFI 1
to [ON].
In OFF, the internal RFI capacitors (filter capacitors)
between the chassis and the intermediate circuit 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 line power.
It is
important to use isolation monitors that work together
with power electronics (IEC 61557-8).
4.5.3 Shielded Cables
It is important to connect shielded cables properly to
ensure high EMC immunity and low emissions.
Connection can be made using either cable connectors
or clamps:
•
EMC cable connectors: generally available cable
connectors can be used to ensure an optimum
EMC connection.
•
EMC cable clamp: Clamps allowing easy
connection are supplied with the unit.
4.6 Motor Connection
4.6.1 Motor Cable
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 an adjustable frequency drive. The factory
setting is for clockwise rotation with the adjustable
frequency drive output connected as follows:
Terminal No.
Function
96, 97, 98, 99
Line power U/T1, V/T2, W/T3
Ground
Table 4.2 Terminal Functions
•
Terminal U/T1/96 connected to U-phase
•
Terminal V/T2/97 connected to V-phase
•
Terminal W/T3/98 connected to W-phase
The direction of rotation can be changed by switching two
phases in the motor cable or by changing the setting of
parameter 4-10 Motor Speed Direction
.
Motor rotation check can be performed via
parameter 1-28 Motor Rotation Check
and following the
steps shown in the display.
Electrical Installation
Installation Manual
MG21B322
Danfoss A/S © 10/2015 All rights reserved.
37
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