Initial Energization - Siemens SIKOSTART 3RW34 Instructions De Service

With main power disconnect device open and control power off, check the following:
1.
2. Control Connections: Check that control power, the start/stop control, and applicable devices have been properly
3. AC Line Power Verification: Verify that each phase of the AC line power at the disconnect device is within the
4. Ground Check: Use an ohmmeter set to its highest scale and observe the following:
7.5

Initial Energization

1.
2. Turn on main AC power and control power to the soft starter; LED 1 comes on.
3. Measure input AC voltages L1 to L2, L2 to L3, and L3 to L1. Voltages should be within the soft starter's rated
4. Measure individual input AC voltages L1, L2 and L3 to ground. On most systems, voltage will be about 58 % of
5. Measure the control voltage. It should be within -15 % to +10 % of the nominal controller rating.
6. Measure voltage across each pole of the SIKOSTART soft starter, i.e., L1 to T1, L2 to T2, and L3 to T3. property
Low voltage, zero voltage, or unequal voltages indicate 1) the load circuit to the motor is open or improperly
grounded, or 2) an SCR is shorted or bad (usually indicated by a double flashing LED 2; refer to Section 10
"Troubleshooting").
To check the load circuit, disconnect power to the soft starter, check and correct connections and close any load
circuit switching device(s). Energize the soft starter and recheck voltage across each pole.
3ZX1012-0RW34-1AN1
Power and Motor Connections: Check that the soft starter has been properly connected to the power source
and motor.
connected to the control terminal board (Fig. 2 and Fig. 3).
rated value of the soft starter as indicated on the unit's nameplate.
a) Check for a ground between each soft starter output terminal (T1, T2, T3) and chassis ground. Each terminal
to ground reading should be over 500 kilohms.
b) The measurement between each input terminal (L1, L2, L3) and ground should be over 500 kilohms.
Hazardous voltage.
Can cause death, serious injury, or
property damage.
To avoid electrical shock or burn, do not operate soft
starter with either the cover or the control terminal
finger guard removed.
Temporarily remove RUN signal connections by opening the circuit at control terminals A1 and A2.
range and balanced for proper motor operation.
If the line voltages are not equal, unbalanced currents in the stator windings occur. A small percentage voltage
unbalance results in a much larger percentage current unbalance. Consequently, the temperature rise of the
motor operating at a particular load and percentage voltage unbalance is greater than for the motor operating
under the same conditions with balanced voltages.
line voltage and nearly equal. Any unbalanced voltage may indicate a ground in the motor or the SIKOSTART soft
starter.
damage.
These voltages should be nearly equal and have values as follows:
a) For a wye motor, the voltage across each pole should be approximately 58 % of the input line to line voltage.
b) For a delta motor, the voltage across each pole should be approximately 100 % of the input line to line voltage.
WARNING
Setup and Operation
21