Veris Industries H709HV Install - Manual (Page 2)

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TM
INSTALLATION GUIDE
H709HV
PRODUCT OVERVIEW
The H709HV 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 threshold (trip point) 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 trip point is adjustable through the action of
a twenty (20) turn potentiometer (see the Calibration section). The status output is
suitable for connection to building controllers or other appropriate data acquisition
equipment operating at up to 250 volts. The H709HV requires no external power
supply to generate its output.
TROUBLESHOOTING
Problem Solution
No reading at controller • Check for control voltage at sensor (<250 VAC, <1.0 A)
• Check for amperage in monitored conductor (>1 A)
• Verify that the setpoint is not above operating amps by
turning the setpoint screw counter-clockwise (up to 20
turns) until the contacts close (Status Closed LED turns
on). Resume calibration from the beginning.
Setpoint screw has no stops The setpoint screw has a slip-clutch at both ends of
its travel to avoid damage. Turn the setpoint screw
twenty full turns counter-clockwise Repeat calibration.
Both LEDs are lit Setpoint screw is too far clockwise. Turn the setpoint
screw twenty full turns counter-clockwise Repeat
calibration.
Output always appears to be
shorted
Verify that output is measured between the two pairs of
terminals, rather than across one pair.
H681x-5A CT
> 135 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.
4x
0.5A
240A
300A: 5A
4A
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.
DANGER: 5A CTs can present hazardous voltages.
Install CTs in accordance with manufacturer's instructions.
Terminate the CT secondary before applying current.
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. < 1 A (Sensor Min.)
CALIBRATION
Before beginning calibration, establish normal load conditions .
OK!
A
OK!
Then choose either A or B below.
A. To monitor under-current (belt loss, coupling shear, status)
1. Turn setpoint screw
counter-clockwise
until Status Open LED
turns on.
2. Slowly turn the screw
clockwise until the
Status Closed LED just
turns on.
3. Turn the screw
an additional 1/4
turn clockwise for
operational margin.
B. To monitor over-current (mechanical problems, seized impeller)
1. Turn setpoint screw
clockwise until Status
Closed LED turns on.
2. Slowly turn the setpoint
screw counter-clockwise
until the Status Open LED
just turns on.
3. Turn the setpoint screw
an additional 1/4 turn
counter-clockwise for
operational margin.
Status
Open
Status
Closed
Setpoint
Status
Open
Status
Closed
Setpoint
¼ Status
Open
Status
Closed
Setpoint
Status
Open
Status
Closed
Setpoint
Status
Open
Status
Closed
Setpoint
¼ Status
Open
Status
Closed
Setpoint