Eaton S801+Soft Starter Complete Guide

6.3 Coordination with bypass contactor

If an isolation switch or contactor needs to be installed on the load side, it must be operated after the soft starter has stopped, otherwise it may damage the SCR or cause false faults.

6.4 Power factor compensation capacitor

The power factor compensation capacitor must be connected to the power supply side of the soft starter and maintain a minimum cable distance of 10 feet from the soft starter. It is strictly prohibited to connect capacitors to the load side, otherwise it will affect overload detection.

Debugging and troubleshooting

7.1 Pre commissioning checklist

The main circuit wiring is correct and the phase sequence is correct.

Control the power supply to 24 Vdc and connect it correctly, with a voltage of ≥ 18 Vdc.

Allow terminal P to have a 24 Vdc signal.

CIM parameter setting: FLA equals the motor nameplate value; The starting time and initial torque are adjusted according to the load; Set the overload level to an appropriate value (usually 20).

If there is a phase sequence fault during the first power on, switch the incoming lines L1 and L2.

7.2 Common Fault Handling

The device does not respond to the start command: check if the allowed terminal P has 24V; if the LED is green; If it is red, read the fault code and handle it; If it is edge triggered mode, the start signal needs to be reapplied.

Starting time too long or too short: Adjust the initial torque and starting time potentiometer. If the static friction force of the load is high, a sudden jump start can be activated.

Sudden tripping during operation: Record fault codes and check for overload, phase loss, or overheating. If it is an overload, check if the load has increased or if the FLA setting is too low.

The bypass contactor cannot be closed: check if the control power supply capacity is sufficient (the voltage drop during surge should not be lower than 17V); Check if the contactor coil is normal; If the soft starter fails to close after multiple attempts, it will switch to SCR operation mode and may eventually overheat and trip.

7.3 Fault code reading

In the fault state, press and hold the reset button on CIM (or apply 24V to terminal 4), and observe the number of flashes of S.S. Trip LED. For example, flashing 3 times, stopping and then flashing 2 times indicates fault code 32. After releasing the button, determine the cause of the malfunction according to Appendix E of the code query manual.

Accessories and Options

S801+offers multiple options to meet different installation needs:

Wiring kit: EML22~EML33, suitable for different cable specifications and quantities.

Panel installation kit: EMA69A~EMA69D, including 3-10 feet of cable, used for remote installation of CIM on cabinet doors.

Installation board/anti vibration board: EMM13xx, EMM14xx, used to simplify installation or enhance anti vibration.

IP20 protective cover: SS-IP20-xx, used to improve terminal protection level.

Fan kit: EMM18, designed to enhance heat dissipation (for high-power applications).

Motor and special application considerations

9.1 Motor type

S801+is suitable for standard squirrel cage motors and can also be used for special motors such as star delta, partial winding, dual voltage, multi speed, etc., but correct wiring is required. For star delta motors, they must be connected in a delta operation mode, and soft starters cannot be connected between internal windings.

9.2 High inertia load

For high inertia loads such as fans and centrifuges, it is necessary to increase the starting time and initial torque appropriately, and use jump starting if necessary. Pay attention to checking the number of starts per hour to avoid exceeding the SCR thermal capacity.

9.3 Frequent Jogging

In Jog mode, the bypass contactor will not close and the motor will be powered entirely by SCR. Frequent tapping can cause SCR to heat up, and it should be ensured that the cumulative on-time per hour does not exceed the allowable value.