Rfi Switch - Danfoss VLT 2811 Quick Manual

1 Quick Guide
1 Alternative fuses 380-500 V drives
VLT
2800
2805-
2820
2855-
2875
2880-
2882
Alternative Fuses 200-240 V drives
2803-
2822
2840
Table 1.4: Prefuses for UL application /cUL

1.4.14 RFI switch

Mains supply isolated from earth:
If the frequency converter is supplied from an isolated mains source ( IT mains) or TT/TN-S mains
with grounded leg, the RFI switch is recommended to be turned off (OFF). For further reference,
see IEC 364-3. In case optimum EMC performance is needed, parallel motors are connected or
the motor cable length is above 25 m, it is recommended to set the switch in ON position.
In OFF position, the internal RFI capacities (filter capacitors) between the chassis and the inter-
mediate circuit are cut off to avoid damage to the intermediate circuit and to reduce the earth
capacity currents (according to IEC 61800-3).
Please also refer to the application note
isolation monitors that are capable for use together with power electronics (IEC 61557-8).
The switch Mk9, placed next to terminal 96, should be removed to disconnect the RFI-filter.
The RFI switch is only available on VLT 2880-2882.
16
Buss- Buss- Buss- Buss-
mann mann mann mann
E52273 E4273 E4273 E4273
RK1/ J/JDDZ T/JDDZ CC/JDDZ CC/JDDZ CC/JDDZ
JDDZ
KTS-R20 JKS-20 JJS-20 FNQ-
R-20
KTS-R25 JKS-25 JJS-25
KTS-R50 JKS-50 JJS-50
KTN-R20 JKS-20 JJN-20
KTN-R25 JKS-25 JJN-25
NB!
The RFI switch is not to be operated with mains connected to the unit. Check that
the mains supply has been disconnected before operating the RFI switch.
The RFI switch disconnects the capacitors galvanically from ground.
MG.28.M1.02 - VLT
Buss- Buss- SIBA Little
mann mann E18027 Fuse
E4273 E4273 6 E81895
RK1/
JDDZ
KTK-R-20 LP-CC-20 5017906-
020
5017906-
025
5014006-
050
5017906-
020
5017906-
025
VLT on IT mains
, MN.90.CX.02. It is important to use
® is a registered Danfoss trademark
VLT 2800 Quick Guide
Ferraz- Ferraz-
Shaw- Shaw-
mut mut
E16326 E16326
7/E2137 7/
E2137
RK1/ CC/JDDZ RK1/
JDDZ JDDZ
KLS-R20 ATM-R25 A6K-20R
KLS-R25 ATM-R20 A6K-25R
KLS-R50 - A6K-50R
KLS-R20 ATM-R25 A6K-20R
KLS-R25 ATM-R20 A6K-25R