Caution, Installation guide, Product overview – Veris Industries H800 Install User Manual

Page 2: Troubleshooting

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INSTALLATION GUIDE

H800

PRODUCT OVERVIEW

The H800 is a current-sensitive switching device that monitors current (amperage) in
the conductor passing through it. A change in amperage in the monitored conducter
that crosses the switch threshold will cause the resistance of the status output to
change state, similar to the action of a mechanical switch. The threshold is fixed at
0.2 A or less. The status output is suitable for connection to building controllers or
other appropriate data acquisition equipment operating at up to 30 volts. The H800
requires no external power supply to generate its output.

TROUBLESHOOTING

Problem

Solution

No Reading at Controller

• Check for control voltage at sensor (<30 V)
• Check for amperage in monitored conductor (>0.25 A)

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

> 200 A (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.

< 0.25 A (Sensor Min.)

0.5A

0.1A

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) to add range 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. This increases the current measured by the
transducer.

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.

240A

300A:

250 A

4.2 A