Veris Industries H722LC Install - Manual (Page 2)

VERIS INDUSTRIES
™
INSTALLATION GUIDE H722LC
Z202943-0A PAGE 2 ©2008 Veris Industries USA 800.354.8556 or +1(0)503.598.4564 / [email protected] 09083
Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.
opEration
The H722LC is a current transducer that senses current (amperage) in any of three
field-selectable ranges: 0-10, 0-20, or 0-40 amperes. These ranges represent the
maximum current that can be applied to the monitored conductor. The H722LC
transforms the monitored current into a 0-5VDC output suitable for connection to
building controllers or other appropriate data acquisition equipment. The H722LC
requires no external power to generate its output.
notEs
troublEshooting
For load currents less than sensor minimum rating:
Wrap the monitored conductor through the center hole and around the sensor body
to produce multiple turns through the "window." This increases the current measured
by the transducer.
• Controller must be
programmed to account
for the extra turns. e.g., if
four turns pass through
the sensor (as shown) the
normal controller reading
must be divided by 4.
DANGER: 5A CTs can present hazardous voltages.
Install CTs in accordance with manufacturer's instructions.
Terminate the CT secondary before applying current.
H681x-5A CT
> 40A (H722LC max.)
For load currents greater than sensor maximum rating:
Use a 5 Amp (H681x series) Current Transformer (CT) as shown.
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. : 30A ÷ 4 Turns = 7.5 Amps max. in monitored conductor
Failure to follow these instructions can result in overheating
and permanent equipment damage.
Problem Solution
No Reading at Controller • Confirm measured current is within the selected
range on the product.
• Check polarity of sensor output connections.
SENSED AMPS
Selected Range*
0 VDC
0A
5 VDC
SENSOR OUTPUT
*Factory calibrated ranges selected
with the amperage range switch
calibration/scaling
Set the amperage range selector switch to a level appropriate for your load. The
H723LC is available with three choices, 0-10, 0-20, or 0-40 Amps.
DDC
CONTROLLER
AI
COMM
0-5VDC Input
CAUTION: Consult
instructions prior
to installation
!
Use min. 75º C insulated conductor
ig20
AMPERAGE
RANGE
40
20
10
OUTPUT
0-10VDC
+ –
+
–
Self-Powered Output
Scale the output as shown below.
Wiring
Amperage Range
Selector Switch