Veris Industries H900 Install - Manual (Page 2)

Z201493-0D PAGE 2 ©2013 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected] 03133
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TM
INSTALLATION GUIDE
H900
OPERATION
The H900 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 FET status output to change state, similar to the action
of a mechanical switch. In this model, the setpoint is fixed at 1.5 A. The status output
is suitable for connection to building controller or other appropriate data acquisition
equipment operating at up to 30 volts. The H900 requires no external power supply
to generate its output.
The H900 housing offers unprecedented mounting flexibility. The mounting bracket
can be attached in three different places. Additionally, the bracket is compatible with
the Veris AH01 DIN Rail clip, allowing DIN mounting.
TROUBLESHOOTING
No Reading at Controller • Check for amperage in monitored conductor (>1.5A).
• Check that amperage in the monitored conductor does
not exceed sensor max (200A).
• Check to be sure that no more than 30VAC/DC or 1.0A
has passed through the contact. Voltages or currents
above these levels will damage the unit.
• Verify that sensor core mating surfaces are clean and
that the core clamp is completely closed
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), divide the normal controller reading
by 4.
4x
1A
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
240A
300A: 5A
4A
> 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.
<1.5 A (Sensor min.)
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.