How to Reset the H2SH Industrial Gearbox After an Emergency Stop

After emergency shutdown, the reset of H2SH industrial gearbox must strictly follow the safety process of first disconnecting the energy and locking the machine, then troubleshooting, and finally step-by-step testing. It is strictly prohibited to forcefully restart under load.

1、 Step 1: Confirmation of safety disconnection and static state

Immediately press the emergency stop button of the corresponding control circuit to cut off the main power supply and control circuit power supply.

Large heavy-duty equipment requires the closure of the drive motor incoming line knife switch, hanging a "Equipment maintenance prohibited closing" sign, and having a dedicated person control the power supply side to prevent accidental power transmission.

Wait for the transmission components of the gearbox to come to a complete stop, let it stand for 1-2 minutes, and confirm that there is no rotational noise before proceeding with subsequent operations.

2、 Step 2: Root cause investigation of emergency shutdown

Mechanical side inspection: Check whether the output end load is stuck (such as foreign objects on the conveyor belt, workpiece jamming, etc.), investigate faults such as gear teeth, bearing locking, lubricant deterioration and agglomeration inside the gearbox, and verify whether the load torque exceeds the rated value of the gearbox.

Electrical side inspection: Use a clamp meter to measure the no-load current of the motor. The normal value is 30%~50% of the rated current. If the deviation is too large, it is judged as an electrical abnormality; Check if the setting current of the thermal relay matches the rated current of the motor. Setting it too low will frequently trigger overload protection.

Protection signal troubleshooting: Confirm one by one that the oil level monitoring, oil temperature monitoring, bearing temperature monitoring and other sensors matched with the gearbox have not triggered alarms, and all safety interlock signals have been reset.

3、 Step 3: Compliance reset of protective device

If the thermal relay is triggered, press the reset button of the thermal relay to confirm that the action mechanism is fully reset, and do not forcefully pry or press it with electricity.

If the frequency converter triggers an overload/emergency stop fault, enter the fault code menu to clear the historical fault records and confirm that the STO safety torque shutdown dual channel status is normal.

On site mushroom head emergency stop button, rotate clockwise 45 ° to pop up and release, completing hardware reset.

If the FLENDER factory safety PLC system is configured, the corresponding reset command needs to be entered on the operation panel to clear the emergency stop status indicator.

4、 Step 4: Step by step machine validation

Disconnect the load side transmission connection (such as the coupling), start the motor with no load first, and confirm that there are no abnormal vibrations or noises.

Run the gearbox without load for 5-10 minutes, monitor the oil temperature to be ≤ 85 ℃, and there is no oil leakage.

Gradually restore 25%, 50%, and 75% of the rated load, run steadily for more than 1 hour at each stage, confirm that the effective vibration speed is ≤ 4.5mm/s, and return to full load condition after no abnormal temperature rise.

It is strictly prohibited to set the automatic restart mode during the reset process. The operator must manually issue an independent start command to prevent the device from accidentally starting up.