H908

H908
Installation Guide
Current Monitoring
TM
TM
H908
Split-Core Current Switch, Adjustable Trip Point
Product Overview
The H908 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 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 H908 requires no external power supply to generate its
output.
RoHS
Compliant
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.
A qualified person is one who has skills and knowledge related to the construction and
operation of this electrical equipment and the installation, and has received safety
training to recognize and avoid the hazards involved.
NEC2009 Article 100
No responsibility is assumed by Veris Industries for any consequences arising out of the
use of this material.
NOTICE
•
•
•
•
The H908 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.
Specifications
Sensor Power
Amperage Range
Status Output Ratings
Insulation Class
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.
Setpoint
Frequency Range
Temperature Range
Humidity Range
Hysteresis
Induced from the monitored conductor
2.5 to 135 A continuous
N.O. 1.0 [email protected] VAC/DC, not polarity sensitive
600 VAC RMS (UL); 300 VAC (CE)
Adjustable, 2.5 A or less
50/60 Hz
-15° to 60°C (5° to 140°F)
10-90% RH non-condensing
10% typical
Off State Resistance
Open switch represents >1 MΩ
On State Resistance
Closed switch represents < 200 mΩ
Terminal Block Wire Size
Terminal Block Torque
24 to 14 AWG (0.2 to 2.1 mm2)
3.5 to 4.4 in-lbs (0.4 to 0.5 N-m)
COMPLIANCE INFORMATION
Agency Approvals
Installation Category
UL508 open device listing, CE: EN61010-1
Cat. III, pollution degree 2
For applications requiring double or reinforced insulation, please contact the factory.
The product design provides basic insulation only.
Do not use the LED indicators as evidence of applied voltage.
Z201494-0F
Page 1 of 4
©2013 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected]
Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Aerospond, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.
Other companies’ trademarks are hereby acknowledged to belong to their respective owners.
Installation Guide
Current Monitoring
H908
TM
Dimensions
Removable Mounting Bracket
1.0”
(25 mm)
3.1”
(79 mm)
1.1”
(26 mm)
0.8”
(21 mm)
Bracket can
be mounted
on three sides
for added
installation
flexibility.
Self-gripping Iris
2.8”
(70 mm)
1.4”*
(36 mm)
Ø 0.3”
(8 mm)
Use DIN Rail Mounting clip
(Veris part number AH01) to
mount on standard DIN rail.
2.5”
(64 mm)
3.0”
(76 mm)
Disconnect and lock out power to the enclosure containing the conductor to be
monitored.
Installation
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
½” (13 mm) from any uninsulated conductors. Determine cable
routing for the controller connection, allowing the wiring to reach Insulated Conductor
the mounting location.
CONTACTOR
CONTROLLER
2. Drill holes to mount the bracket to the chosen surface using the
included screws.
Digital
Input
3. Wire the output connections from the sensor to the controller
(solid-state contact).
4. Snap the sensor over the conductor and clip the assembly to the
mounting bracket.
5. Secure the enclosure and reconnect power.
6. Calibrate the sensor with the load running normally.
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MOTOR
Fan or Pump
©2013 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected]
Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Aerospond, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.
Other companies’ trademarks are hereby acknowledged to belong to their respective owners.
Installation Guide
Current Monitoring
H908
Notes
TM
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.
240A
>135 A (sensor max.)
300A:5A
4A
H68xx-5A CT
DANGER: 5A CTs can present
hazardous voltages. Install
CTs in accordance with
manufacturer's instructions.
Terminate the CT secondary
before applying current.
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 reading by 4).
< 2.5 A (Sensor Min.)
1A
4x
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.
Z201494-0F
Page 3 of 4
©2013 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected]
Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Aerospond, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.
Other companies’ trademarks are hereby acknowledged to belong to their respective owners.
Installation Guide
Current Monitoring
H908
Calibration
TM
Before beginning calibration, establish normal load conditions. Then choose either A or B below.
A. To monitor under-current (belt loss, coupling shear, status)
1. Turn setpoint screw clockwise
until Status Open LED turns
on.
Setpoint
Status
Open
2. Slowly turn the screw counter
clockwise until the Status
Closed LED turns on.
3. Turn the screw an additional
¼ turn counter clockwise for
operational margin.
Status
Closed
Setpoint
Status
Open
Status
Closed
Setpoint
¼
Status
Open
Status
Closed
B. To monitor over-current (mechanical problems, seized impeller)
1. Turn setpoint screw counter
clockwise until Status Closed
LED turns on.
Setpoint
Status
Open
2. Slowly turn the setpoint screw
clockwise until the Status
Open LED just turns on.
3. Turn the setpoint screw an
additional ¼ turn clockwise
for operational margin.
Troubleshooting
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Problem
Status
Closed
Setpoint
Status
Open
Status
Closed
Setpoint
¼
Status
Open
Status
Closed
Solution
No Reading at Controller
• Check sensor calibration (see above)
• Check for amperage in monitored conductor (> 2.5A)
• Assure that sensor core mating surfaces are clean and that the core clamp is completely closed
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.
©2013 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected]
Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Aerospond, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.
Other companies’ trademarks are hereby acknowledged to belong to their respective owners.
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