Rfi Switch; Residual Current Device; Final Set-Up And Test - Danfoss VLT FC 102 Series Design Manual

Electrical Installation

6.8.4 RFI Switch

Line power supply isolated from ground
If the adjustable frequency drive is supplied from an
isolated line power source (IT line power, floating delta) or
TT/TN-S line power with grounded leg (grounded delta),
turn off the RFI switch via 14-50 RFI 1.
In OFF, the internal capacitors between the chassis
(ground), the input RFI filter and the intermediate circuit
are cut off. As the RFI switch is turned off, the adjustable
frequency drive is not be able to meet optimum EMC
performance.
By opening the RFI filter switch, the ground leakage
currents are also reduced, but not the high-frequency
leakage currents caused by the switching of the inverter. It
is important to use isolation monitors that are capable for
use with power electronics (IEC61557-8), e.g., Deif type
SIM-Q, Bender type IRDH 275/375 or similar.
Also refer to the application note VLT on IT line power.
NOTICE!
If the RFI switch is not turned off and the adjustable
frequency drive is running on isolated grids, ground
faults can potentially lead to charge-up of the
intermediate circuit and cause DC capacitor damage or
result in reduced product life.

6.9 Residual Current Device

Use RCD relays, multiple protective grounding as extra
protection, provided that local safety regulations are
complied with.
If a ground fault appears, a DC content may develop in the
faulty current.
If RCD relays are used, observe local regulations. Relays
must be suitable for protection of three-phase equipment
with a bridge rectifier and for a brief discharge on power-
up, see chapter 2.11 Ground Leakage Current for further
information.

6.10 Final Set-up and Test

To test the set-up and ensure that the adjustable
frequency drive is running, follow these steps.
Step 1. Locate the motor nameplate
NOTICE!
The motor is either star- (Y) or delta-connected (Δ). This
information is located on the motor nameplate data.
MG11BC22
Design Guide
Figure 6.69 Motor Nameplate
Step 2. Enter the motor nameplate data in this
parameter list.
To access this list, press [Quick Menu] and select "Q2 Quick
Set-up".
1.
2.
3.
4.
5.
Danfoss A/S © Rev. 06/2014 All rights reserved.
BAUER D-7 3734 ESLINGEN
3~ MOTOR NR. 1827421 2003
S/E005A9
1,5 KW
n 31,5 /MIN. 400
n 1400 /MIN. 50
cos 0,80 3,6
1,7L
B IP 65 H1/1A
1-20 Motor Power [kW].
1-21 Motor Power [HP].
1-22 Motor Voltage.
1-23 Motor Frequency.
1-24 Motor Current.
1-25 Motor Nominal Speed.
6
Y V
Hz
A
133
6