Caution, Installation guide, Operation – Veris Industries H800NC Install User Manual

Page 2: Troubleshooting

INSTALLATION GUIDE

H800NC

Z201981-0C

PAGE 2

03132

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OPERATION

The H800NC is a current-sensitive switching device that monitors current (amperage)
in the conductor passing through it. A change in amperage in the monitored
conductor that crosses the switch (setpoint) threshold plus the hysteresis value
causes the resistance of the status output to change state, similar to the action of a
mechanical switch. In this model, the setpoint is fixed at 0.5 A. The status output is
suitable for connection to building controllers or other appropriate data acquisition
equipment operating at up to 30 volts. The H800NC requires a 5-30 VDC external
power supply to generate its output.

TROUBLESHOOTING

Problem

Solution

No Reading at Controller

• Check for control voltage at sensor (<30V)
• Check for amperage in monitored conductor (> 0.5A

@ 60Hz)

NOTES

For load currents greater than sensor maximum rating:

Use a 5 Amp (H68xx series) current transformer (CT) as shown. This technique can be
combined with wrapping (see below) when added range is desired for a low current
load on a high current source.

For load currents less than sensor minimum rating:

Wrap the monitored conductor through the center window and around the sensor
body to produce multiple turns through the center window. This increases the current
measured by the transducer.

DANGER: 5A CTs can present hazardous voltages.

Install CTs in accordance with manufacturer's

instructions. Terminate the CT secondary before applying

current.

H68xx‑5A CT

> 200A (Sensor max.)

CAUTION

RISK OF EQUIPMENT DAMAGE

• Derate the product’s maximum current for the number of turns

through the sensing window using the following formula.

Rated Max. Amps ÷ Number of Turns = Max. monitored Amps
e.g. : 100A ÷ 4 Turns = 25 Amps max. in monitored conductor

• Failure to follow these instructions can result in overheating

and permanent equipment damage.

Program the controller to
account for the extra turns.
e.g., if four turns pass through
the sensor (as shown), then
divide the normal controller
reading by 4.

< 0.5 A (Sensor Min.)

240A

300A:

250

4.2

0.5A

0.4A