Application Notes: New Construction

New Construction:

For monitoring fan and pump status on new construction applications (or anywhere the wires to the motor can be easily removed), the most cost effective solution is to utilize the VERIS 700 series digital current switch. The 700 series saves significant installation costs by eliminating the need for costly fitter time and recalibration. The solid core design of this industry-standard series provides the lowest hardware cost in applications where removing the wires on the primary feed can be accomplished without significant cost. The Veris 700 series sensors come in a variety of output configurations to meet the needs of any automation control system installations.

Installation Instructions:

Mount the 700 series current switch on one phase of the motor between the mag starter and the motor (typically in the motor control center) - the 700 series products are all UL 508 listed devices for field mounting
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 (See "Monitoring Variable Frequency Drives")
- 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 (< 1 to 2 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.)
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. (NOTE: When using the H-908, multiple wraps of the primary conductor through the center of the switch will be required)
- Set up the Hawkeye following normal installation procedures
If the wire is difficult to remove or the power cannot be interrupted, use the VERIS 908 split core sensor. This sensor permits the installer to snap the sensor around the wire without the need for mounting the switch or disconnecting the wire. See the next section "Retrofit Applications" for installation information.

Typical Installation:

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.