Electric Current Level Sensor

The Electric Current Level Sensor is a vital component within the control box assembly of several Van Norman FG5000 and FG10000 Flywheel Grinder models with different voltage and phase configurations. It plays a key role in the Auto-Grind system by monitoring the amperage drawn by the grinding motor to prevent overloading.

The Electric Current Level Sensor is a critical component located within the control box assembly of specific Van Norman Flywheel Grinder models with the Auto-Grind feature. This sensor is listed as part of the control box assembly for the following more popular configurations:

• FG10000 208-230V, 60 Hz, 3 Phase PAG (794-8688-06)
• FG10000 380V, 50 Hz, 3 Phase PAG (794-8688-37)
• FG10000 460V, 60 Hz, 3 Phase PAG (794-8688-38)
• FG5000 208-230V, 60 Hz, 3 Phase PAG (794-8688-50)
• FG5000 208-230V, 60 Hz, 1 Phase PAG (794-8688-51)
• FG5000 380V, 50 Hz, 3 Phase PAG (794-8688-52)
• FG5000 460V, 60 Hz, 3 Phase PAG (794-8688-53)

For more information about our various Flywheel Grinder Models please use our contact form sumission page to ask your questions.

This Electric Current Level Sensor is a key element of the Auto-Grind system on these flywheel grinder models. Its primary function is to continuously monitor the amount of electrical current (amps) being drawn by the grinding motor. This monitoring is crucial for preventing the grinding motor from being forced too aggressively onto the workpiece during the automated grinding process.

If the amp draw becomes excessively high, indicating that the grinding motor is under significant load, the sensor will trigger a temporary stop in the downward movement of the Auto-Grind gearmotor. This brief pause allows the grinding process to “catch up” and for the amp draw to return to a normal, safer range. Once the current level drops, the Auto-Grind gearmotor is automatically re-engaged, and the grinding process continues.

This cycle of pausing and restarting the feed can occur multiple times during a single grinding operation if the Auto-Grind feature is set to remove material too aggressively. Frequent activation of this safety mechanism can be an indication that the grinding speed control should be reduced to better match the grinder’s material removal capability. It can also signal that the grinding stone has become loaded with material and requires cleaning by dressing the stone.