Overspeed Governor Function
Overspeed Governor Test
The Overspeed Governor test can be used to run the drive above maximum speed once during commissioning. The drive runs at the percentage set in P10-12 of P8-06. For example if P8-06 is set to 1500rpm & P10-12 is set set to 110% then the drive will run at 1650rpm.
Once the drive has performed this run the maximum speed is then clamped back to the value in P8-01 and the value in P10-12 is automatically set back to 0.0%.
Note
When performing the Overspeed Governor test the drive ignores all speed parameters in Group 8 and will only run at the speed assigned from the combination of P8-06 & P10-12 regardless of the state of the speed selection Digital Inputs.
Parameter Number | Parameter Name | Units | Default | Available Settings | Access | Change During Run | Scaling | Size (Bytes) | CAN Register | CAN Sub Index | Modbus Register |
|---|---|---|---|---|---|---|---|---|---|---|---|
P10-12 | Overspeed Governor test speed | % | 0.0% | 0.0 ... 125% | RW | - | - | 2 | 23F4h | 0 | 1012 |
Parameter P10-12 can be used for testing of overspeed governors, normally performed during initial installation or scheduled inspections.
Once a value of >0.0 has been entered, the next run command from the controller to the drive will result in the motor running at the value set in terms of a % of the value set in the High Speed parameter (P8-06), then at the next stop command the value of the parameter will return to 0.0 automatically so that the test is not repeated, and normal operation is resumed.
Below are a few common problems encountered and simple solutions:
Problem | Solutions | Note |
|---|---|---|
Overspeed test does not go over P8-01 value | Check that P10-12 is > 100.0% | When P10-12 is set to 100% then the drive will run at the value in P8-06. To run over P8-01 value set P8-06 to equal P8-01 then set P10-12 to > 100%. For example if P8-06 = 1000rpm & P10-12 = 110.0% then the drive would run at 1100rpm during the test. Where as if P8-06 = 1000rpm & P10-12 = 90% then the drive would run at 900rpm during the test. |