H708

H708
INSTALLATION GUIDE
CURRENT MONITORING
TM
H708
TM
708
Solid-Core Current Switch, Adjustable Trip Point
Installer’s Specifications
Amperage Range
1-135 A Continuous
External Supply Voltage
Induced from monitored conductor
Frequency
50/60 Hz
Insulation Class
600 VAC RMS (UL) 300 VAC RMS (CE)
Temperature Range-15° to 60°C (5° to 140°F)
Humidity Range
10-90% RH non-condensing
Hysteresis
10% typical
Status Output Ratings
N.O. 1.0 [email protected] VAC/DC
Terminal Block Max. Wire Size
14 AWG
Terminal Block Torque (nom.)
4 in-lbs (0.45 N-m)
Agency Approvals
UL 508, E150462
Specification Note: For CE compliance, conductor shall be insulated according to IEC 61010‑1:2010,
Installation Category III or equivalent.
The unit design provides for basic insulation only.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
•
•
•
•
•
Follow safe electrical work practices. See NFPA 70E in the USA, or applicable local codes.
This equipment must only be installed and serviced by qualified electrical personnel.
Read, understand and follow the instructions before installing this product.
Turn off all power supplying equipment before working on or inside the equipment.
Use a properly rated voltage sensing device to confirm power is off.
DO NOT DEPEND ON THIS PRODUCT FOR VOLTAGE INDICATION
• Only install this product on insulated conductors.
Failure to follow these instructions will result in death or serious injury.
Disconnect and lock out power to the enclosure containing the
conductor to be monitored.
1. Locate a mounting surface for the removable mounting bracket that will allow
the monitored conductor to pass through the center window when it is installed
and that will keep the product at least 1/2” from any uninsulated conductors.
Determine cable routing for the controller connection, allowing wiring to reach
the mounting location.
2. Drill holes to mount the bracket to the chosen surface using the included screws.
NOTICE
•
•
•
•
INSTALLATION
This product is not intended for life or safety applications.
Do not install this product in hazardous or classified locations.
The installer is responsible for conformance to all applicable codes.
Mount this product inside a suitable fire and electrical enclosure.
3. Wire the output connections between the sensor and the controller (solid-state
contact).
4. Route the conductor through the sensor’s center window and slip the assembly
into the mounting bracket.
5. Calibrate the sensor (see page 2) with the load running normally.
WIRING EXAMPLE
6. Secure enclosure and reconnect power.
DIMENSIONS
Insulated Conductor Only
Removable/Adjustable Mounting Bracket
CONTACTOR
0.9"
(23 mm)
DDC CONTROLLER
0 0.7"
(19 mm)
3.0"
(75 mm)
DI
Fan or Pump
2.8"
(68 mm)
1.1"
(27 mm)
Motor
Z201484-0E
PAGE 1
0.2” x 0.15”
slot (2x)
3.8"
(95 mm)
4.2"
(106 mm)
©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected]
01121
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.
INSTALLATION GUIDE
H708
TM
OPERATION
CALIBRATION
The H708 is a current-sensitive switching device that monitors current (amperage) in
the conductor passing through it. A change in the conductor’s amperage that crosses
the adjustable switch 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 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 30 volts. The H708 requires no external power supply to generate
its output.
Before beginning calibration, establish normal load conditions.
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.
> 135 A (Sensor max.)
240A
OK!
OK!
A
Then choose either A or B below.
A. To monitor under-current (belt loss, coupling shear, status)
!
STATUS
OK!
OK!
A
Status
Open Setpoint
1. Turn setpoint screw
clockwise until Status Open
LED turns ON.
STOP
2. Slowly turn the screw counter‑clockwise until the Status Closed LED just
turns ON.
3.Turn the screw an
Setpoint
Status
Setpoint Closed
additional 1/4 turn
counter‑clockwise for
1/4 operational margin.
+
STOP
300A:5A
H68xx-5A CT
B. To monitor over-current (mechanical problems, seized impeller)
!
DANGER: 5A CTs can present hazardous voltages.
Install CTs in accordance with manufacturer's instructions.
Terminate the CT secondary before applying current.
CAUTION
STATUS
OK!
OK!
A
1. Turn setpoint screw
counter‑clockwise until Status
Closed LED turns on.
Status
Setpoint Closed
STOP
RISK OF EQUIPMENT DAMAGE
• Derate the product’s maximum current for the number of turns
through the sensing window using the following formula.
2. Slowly turn the setpoint screw clockwise until the Status Open LED
just turns on.
Status
Open Setpoint
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.
Setpoint
STOP
+ 1/4
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.
< 1 A (Sensor Min.)
4x
TROUBLESHOOTING
Problem
PAGE 2
Solution
No Reading at Controller
• Check sensor calibration (see above)
• Check for control voltage at sensor (<30 V, <1.0 A)
• Check for amperage in monitored conductor (>1 A)
Setpoint screw has no
stops
The setpoint screw has a slip-clutch at both ends of its travel to
avoid damage. Twenty turns CCW will reset the sensor to be
most sensitive. Repeat calibration above.
Both LEDs are lit
Setpoint screw is too far clockwise. See solution above.
0.5A
Z201484-0E
3. Turn the
setpoint screw
an additional 1/4
turn clockwise
for operational
margin.
©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected]
01121
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.
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