Siemens 3UW51 02-1K Installation, Operation & Maintenance Instructions Manual - Page 2
Browse online or download pdf Installation, Operation & Maintenance Instructions Manual for Controller Siemens 3UW51 02-1K. Siemens 3UW51 02-1K 6 pages. Automatic star delta starter
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Fig. 2 & 3: Cable Connections
Commissioning: Read the note carefully before commissioning.
Fig. 4: Maximum permissible mounting position from vertical plane
For exact setting of timer and overload relay, follow the
instruction given below:
Before switching ON recheck all external connections
• Star-Delta Timer setting for ASD-11:
– First start the motor by pressing the 'ON' button shown
in Fig. 1
– Measure the time taken by the motor to nearly reach
rated speed or steady state current condition (indicated
when the motor reaches a steady hum).
– Stop the motor. Set the timer to this measured value by
rotating the dial shown in Fig. 5.
• Overload relay setting:
– For closer protection set the overload relay to actual
phase current as measured by an ammeter.
– Overload relay characteristics shown in Fig. 6 can be
used to estimate the average tripping time at different
multiples of set current.
– In the absence of an ammeter, use the procedure given
below:
2
Fig. 5: Timer Adjustment
– Start the motor and let it run for 30 mins. Then
gradually reduce the relay settings till it trips. Set the
relay at a slightly higher value than this setting.
– Restart the motor after some time. If the relay does not
trip then consider it to be properly set. If the relay trips,
set at a little higher value than before and recheck.
• Fix the front cover with Torque of
Caution
• During commissioning or maintenance always ensure
that the main supply is disconnected by switching off
the main switch.
• In the case of ASD starters under no circumstances
should the relay be set higher than the phase current
i.e. 0.58 times the rated current on the motor name
plate.
• If the relay trips even when set at rated motor current,
the suitability of the starter/relay for the particular
application should be checked with the nearest
Siemens office.
Dial
100 to 130
N-cm.