Veris Industries H940 Install - Manual (Page 2)

TM
INSTALLATION GUIDE
H940
Z201498-0B PAGE 2 ©2013 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected] 01132
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PRODUCT OVERVIEW
The H940 is a current-sensitive switching device with integral command relay 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 will cause the resistance of the status output to change
state, similar to the action of a mechanical switch. This status information can be fed
back to a building controller that interprets the signal and separately switches the
relay. The status output can also be used to switch the relay directly.
In this model, the setpoint is fixed at 1.5 A. The status output is suitable for
connection to building controllers or other appropriate data acquisition equipment
operating at up to 30 volts. The H940 relay requires a 24 VAC/VDC external power
supply for operation.
The H940 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
Problem Solution
No Reading at Controller • Check for control voltage at sensor (<30V)
• Check for amperage in monitored conductor (>1.5A)
• Assure 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.
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
>200A (Sensor max.)
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.
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) them
divide the controller reading
by 4.
< 1.5 A (Sensor Min.)
240A
300A: 5A
4A
RELAY RATINGS
Voltage AC DC
24V................................... 10mA 10mA
12V.................................................................... 20mA
TYPICAL COIL PERFORMANCE
RELAY CONTACT RATINGS
Resistive.................................. 8A@250VAC, 30VDC
Inductive................................. 3.5A@250VAC, 30VDC
Pull In Voltage................................................. 20.1VDC
Drop Out Voltage............................................. 5.2VDC