Star-Delta Starter
SDH
Star-Delta Starter
Application
This is automatic reduced voltage starter to ease the damage to power and load by reducing the starting current and torque.
Type name of Star-delta starter
2 magnetic contactors model: SDH
3 magnetic contactors model: SDH3
Features
1.Please be sure to turn off the power when adjust timer. If the adjustment is done with turning on,
that may lead to erroneous operation.
2.Setting of change-over timer
The change-over timer can be adjusted with the knob on the front of timer. In accordance with
starting time of motor, the timer can be adjusted from 5 to 60s. However, standard duration of
maximum starting current is within 15s.
3.Regarding 2-contactor type, motor is being impressed voltage while it doesn't operate. Depends
on the use environment, that may lead to burnout of motor or electrical shock. Please be sure to
install a breaker on primary side, not to impress voltage on motor by breaking the circuit. 3-contactor
type is recommended to use.
4.Switching frequency is 3 ops/hour. If operate repeatedly (e.g. test operation), please be sure not to
exceed 3 ops/hour. After that operation, please take down time for 1 hour.
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