33 • Recommended Wiring diagrams
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4.22.5 RVS-DN Connected Inside Delta - Reverse Speed
IMPORTANT! If speed reversing is required, L1, L2 and L3 on the input of the RVS-DN can not
be
switched!
This is because PHASE SEQUENCE OFF can not be implemented when RVS-DN is connected Inside
Delta. Thus, in order to reverse motor rotation two motor windings need to be switched as shown in the
following diagram:
(Winding V1-V2 is switched with winding U1-U2):
Reverse speed with RVS-DN connection Inside Delta with bypass contactor to the RVS-
DN and Inside Delta contactor.
C1 is a bypass contactor.
C2 is an Inside Delta contactor.
U1-U2, V1-V2, W1-W2 are motor windings.
L1-U, L2-V, L3-W are RVS-DN controlled phases.
L1b, L2b, L3b are preparation for bypass to maintain current protection when the RVS-DN is
bypassed.
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