“Inside Delta” mode - Description
44
M
UVW
L1 L2 L3
U
U'
WW'
V
V'
General information
• Mains current is reduced by 1.73 (3), namely for an
800A motor, an 820A starter will be selected, to
operate “In-Line”. For “Inside Delta” starter, we
calculate (800 / 1.73 = ) and select a 460A starter.
• Less heat dissipates in the cabinet
vs. the standard “In-Line”
connection.
Standard Motor Connection Box
Important Notes:
• Wrong motor connection will cause serious
damage to the motor windings.
• The sinusoidal shape of the current is imperfect (since
each phase is separately fired and not influenced by
other phase firing). As a result, higher harmonic
content is incurred (THD), which can be as high as
twice the THD value as in the standard “In-Line”.
• Higher motor heating is expected for the same motor
size (due to the higher THD).
• Phase sequence must be correct; otherwise, “Phase
Sequence fault” will trip the starter immediately
(without any damage).
• Higher torques can not be obtained
• “Inside Delta” requires 6-wire to the motor.
• Factory preset - features and functions when “Inside
Delta” mode is configured:
• No Pulse Start.
• No curve selection (Curve 0 !!).
• No Energy Save
• No Slow Speed
• No Phase sequence “Off” mode
Note :
For a high starting torque process, we recommend to
use the starter in the “standard” connection (in-line).
Standard Inside Delta Connection
Motor Ratings for In-Line and
Inside Delta, at 400V
Starter Type
In Line
Soft-Starter
Current (A)
Motor KW @400V
“In- Line”
Motor KW @ 400V
“Inside Delta”
RVS-DN 8 8 4 6
RVS-DN 17 17 7.5 12
RVS-DN 31 31 15 25
RVS-DN 44 44 22 38
RVS-DN 58 58 30 50
RVS-DN 72 72 37 64
RVS-DN 85 85 45 75
RVS-DN 105 105 55 95
RVS-DN 145 145 75 120
RVS-DN 170 170 90 155
RVS-DN 210 210 110 190
RVS-DN 310 310 160 275
RVS-DN 390 390 220 380
RVS-DN 460 460 250 430
RVS-DN 580 580 315 540
RVS-DN 820 820 450 770
RVS-DN 1100 1100 600 1000
RVS-DN 1400 1400 750 1300
The starter must always be selected according to motor’s nominal current and starting conditions.
For “Inside Delta” connection, the “In Line” KW ratings were multiplied by 1.73.
WARNING
Beware
Wrong connection of the starter or the Motor,
will seriously damage the motor.
U
U'
V
V'
W
W'
Motor Connections
L1
V
W
L2L3
U
L1
U
U'
L3 W W '
L2
V
V'
The attached
drawings are fo
reference
purposes only.
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