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Option 2: Mount a Hawkeye 720 analog sensor on the load side

If it is important to measure the load on the motor accurately or if the motor will be operated at less than 25 Hz, the Hawkeye 720 with its unique polymer core provides the industry's only current sensor which can be installed on the load side of the inverter. Using this approach, the end user gains valuable information regarding the load on the motor and can verify that the VFD is functioning properly.

Hawkeye 720 installation:

Installation instructions:

1. Disconnect power from the motor
2. Install the 720 sensor so that the primary conductor between the inverter and the motor passes through the center hole of the sensor
3. Power the sensor using a 24VAC/DC power supply either from the automation panel or from a separate source as shown below:
   
   
4. Reconnect the sensed conductor to the motor
5. With the motor off, adjust the zero potentiometer until the output equals 4 mA
6. Start the motor and operate at 60 Hz
7. Using a clip-on amp probe, measure the amperage flowing through the primary
8. Adjust the span potentiometer on the 720 until the output equals 20 mA
9. Determine the software scaling using the following formula:

   Amps/mA ratio = Max amps (from #7 above) / 16

   Primary amps = (mA output - 4) * (Amps/mA ratio)

Set software alarm points as needed to indicate belt breakage

Applications are suggestions. Field applications vary; since manufacturer does not install the devices, it is up to the installer to ensure suitability and compliance to appropriate codes.

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Last Updated 03/21/07