Application Notes: Retrofit Applications

Retrofit applications:

For retrofit applications (or new installations where the wiring is already in place) , the VERIS 900 series sensors provide the most cost-effective installation alternative. The 900 series sensors require no mounting as they have an exclusive self-gripping design. The self-gripping iris provides a means of centering the switch for high accuracy and also eliminates the need for costly mounting in the motor control center. The 900 also eliminates the need for relocating wires in motor control centers to center the wire through the hole. This unique device provides both AC and DC switching capability to meet the needs of any automation panel.

Installation Instructions:

Mount the 900 series current switch on one phase of the motor by snapping the unit around the wire (no need to remove the wire) with the output terminals and potentiometer facing the front of the motor starter;
Adjust the potentiometer until the "Output Status" LED just switches on;
Turn the potentiometer CCW ~ 1/4 turn;
The unit is now calibrated to detect mechanical or electrical failures

Special installations:

For variable frequency drives (VFD's):
- Mount the switch on the line side of the inverter for most VFD's
- Follow the installation instructions above, except the potentiometer should be turned CCW ~ 1/2 turn, not 1/4
- For best results, use the VERIS 707 or 907 series switches for mounting on the load side of the inverter
For low current (< 3 to 5 amps):

Loop the primary (sensed) conductor wire through the hole in the switch several times (each loop adds a multiple to the sensed current: 2 loops = 2x , 3 loops = 3x, etc.)
On the 900 series, there is no need to remove the wire to loop it, simply wrap the primary conductor through the opening in the switch and the center hole of the switch
If the switch function is intermittent or unpredictable, loop the wire through the switch more times till the device provides a solid output

Troubleshooting tips:

If the output is unstable (e.g., intermittent or unpredictable), loop the primary wire through the center hole to increase the amount of sensed current
If the wire is too large or the current exceeds 135 amps:
- Use a separate current transformer on the primary current and feed the secondary output through the Hawkeye.
- Choose a current transformer of the appropriate amperage range with a 5 amp secondary (e.g., 300 : 5 for a 300 amp primary with a 5 amp secondary)
- Loop one leg of the secondary through the Hawkeye and short to the other output wire, forming a loop through the Hawkeye with a 5 amp maximum output
- Set up the Hawkeye following normal installation procedures
If it is necessary to remove a 900 series switch after installation:
- Turn off power to the motor
- Use a small bladed screwdriver to lift one of the latching "ears" out of the slot
- Lift the other "ear" out of its slot and the unit should be easily removed
(Note: the 900 series is intended to be permanently installed in the motor control center and is not designed to be removed and used in multiple installations as a test device. Consult factory for alternative products to be used where repeated removal is necessary.)

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.