31 • Recommended Wiring diagrams
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4.22.2 Notes on Inside Delta Connection
• Inside Delta requires 6-wires to the motor.
• Wrong motor connection might cause serious damage to the motor windings.
• When installing the RVS-DN Inside Delta it is highly recommended to use a contactor in series
to the RVS-DN or upstream (after motor protection) in order to avoid a damage to the motor if
the RVS-DN short circuits.
• The sinusoidal shape of the current might be imperfect. As a result, higher harmonic content is
incurred (THD), which may be twice the THD value as in the standard In-Line connection.
• Motor heat may increase (due to the higher THD).
• Phase sequence to the input of the RVS-DN (L1, L2 & L3 terminals) must be correct.
Otherwise, PHASE SEQUENCE fault will trip the RVS-DN immediately.
• Higher torque can not be obtained.
• The following factory preset features and functions are not active when Inside Delta mode is
configured:
o PULSE START
o Curve selection (CURVE 0 !! only).
o EN. SAVE and SL. SPD (energy save and slow speed)
o PHASE SEQUENCE in off mode
• When using INSIDE DELTA configuration, current wave shape is different than that in LINE
configuration. This difference casus the current RMS value of the INSIDE DELTA configuration
to be lower than that of LINE configuration assuming both have the same amplitude.
In order to best protect the SCRs in the INSIDE DELTA we do not allow the amplitude of the
current to be higher than that in LINE connection. Therefore the current RMS value expected
for the same setting of the CURRENT LIMIT is lower by 10 ~ 30% than that in LINE connection
.
Note :
For a high starting torque process, it is recommended to use the RVS-DN in the In Line connection.
Beware!
Wrong connection of the RVS-DN or the motor may seriously damage the motor.
INSIDE
DELTA
WARNINGS!
When using Inside Delta connection:
• It is highly recommended to use a line contactor in order to avoid possible
damage of the motor if the SCR is short circuited in the RVS-DN.
• If the RVS-DN is connected Inside the Delta, motor terminals are “live” (full
voltage) even when the contactor is open.
4.22.3 Motor Connection and Terminals
Motor connection in Delta with no RVS-DN.
Note:
Motor terminals are marked as follows:
ASA (USA) BS VDE IEC
T1 - T4 A1-A2 U - X U1 - U2
T2 - T5 B1-B2 V - Y V1 - V2
T3 - T6 C1-C2 W - Z W1 - W2
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