Page 1
Installation Guide
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.
• Product may use multiple voltage/power sources. Be sure all sources of power
have been disconnected before servicing.
• 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 qualied 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. NEC2011 Article 100
No responsibility is assumed by Veris Industries for any consequences arising out of the
use of this material.
DANGER
3.0”
Fan or Pump
CONTROLLER
Motor
CONTACTOR
DI
(Status)
DO
(Relay
Coil)
CONTROL
POWER
Current Monitoring
Installation Guide
Current Monitoring
TM
H948
TM
NOTICE
• 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.
TM
H948
Split-Core Current Switch, Adjustable Output,
with Command Relay
Product Overview
The H948 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 causes the resistance of the status output to change state, similar to
the action of a mechanical switch. The building controller 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 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 H948 relay requires a 24VAC/24VDC external power supply for
operation.
The H948 housing oers unprecedented mounting exibility. The mounting bracket can be attached in three
dierent places. Additionally, the bracket is compatible with the Veris AH01 DIN Rail clip, allowing DIN mounting.
Specifications
Sensor Power
Relay Power
Amperage Range
Status Output Ratings
Insulation Class
Setpoint
Frequency Range
Temperature Range
Humidity Range
Hysteresis
Off State Resistance
On State Resistance
Terminal Block Max. W ire Size
Terminal Block Torque
Agency Approvals
Installation Category
The product design provides basic insulation only.
For applications requiring double or reinforced insulation, please contact the factory.
Do not use the LED indicators as evidence of applied voltage.
Induced from the monitored conductor
24VAC/24VDC external power supply
2.5 to 135 A continuous
N.O. 1.0 A@ 30 VAC / DC, not polarity sensitive
600 VAC RMS (UL)
Adjustable, 2.5 A or less
50 /60 Hz
-15° to 60°C ( 5° to 140°F )
10-9 0% RH non-condensing
10% t ypical
Open switch represents >1 MΩ
Closed switch represents < 200 mΩ
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
UL508 open device listing
Cat. III, pollution degree 2
Dimensions
Installation
Removable Mounting Bracket
3.1”
(79 mm)
1.1”
(26 mm)
1.0”
(25 mm)
0.8”
(21 mm)
Bracket can
be mounted
on three sides
for added
installation
exibility.
Self-gripping Iris
2.8”
(70 mm)
Use DIN Rail
Mounting clip
(Veris part
number AH01)
to mount on
Ø 0.3”
(8 mm)
2.5”
(64 mm)
1.4”
(36 mm)
standard DIN rail.
1. Disconnect and lock out power to the enclosure containing the conduc tor to be monitored.
2. Locate a mounting surface for the removable mounting bracket
that will allow the monitored conduc tor 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 the mounting location.
3. Drill holes to mount the bracket to the chosen sur face using the
included screws.
4. Wire the output connections from the sensor output terminals
to the controller (solid-state contact) and from the sensor relay
terminals to the relay power supply.
5. Snap the sensor over the conductor and clip the assembly to the
mounting bracket.
6. Secure the enclosure and reconnect power.
7. Calibrate the sensor with the load running normally.
Z201499-0B Page 1 of 4 ©2014 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 04142
Alta Labs, E nercept, Ensp ector, Hawkeye, Trus tat, Aerospo nd, Veris, and th e Veris ‘V’ log o are tradema rks or registe red tradema rks of Veris Ind ustries, L. L.C. in the USA and /or other countri es.
Other companies’ trademarks are hereby acknowledged to belong to their respective owners.
Find Quality Products Online at: sales@GlobalTestSupply.com
Z201499-0B Page 2 of 4 ©2014 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 04142
Alta Labs, E nercept, Ensp ector, Hawkeye, Trus tat, Aerospo nd, Veris, and th e Veris ‘V’ log o are tradema rks or registe red tradema rks of Veris Ind ustries, L. L.C. in the USA and /or other countri es.
Other companies’ trademarks are hereby acknowledged to belong to their respective owners.
www.GlobalTestSupply.com
Page 2
Installation Guide
Current Monitoring
H948
Installation Guide
Current Monitoring
TM
H948
TM
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.
240A
>135 A (sensor max.)
DANGER
5A CTs can
present hazardous voltages.
Install CTs in accordance with
manufacturer's instructions.
4A
5A
300A:
H68 xx-5A CT
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
• 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.
CAUTION
RISK OF EQUIPMENT DAMAGE
Calibration
Before beginning calibration, establish normal load conditions. Then choose either A or B below.
A. To monitor under-current (belt loss, coupling shear, status)
Status
Open
Status
Open
Status
Open
Setpoint
Status
Closed
Setpoint
Status
Closed
Setpoint
Status
Closed
1. Turn setpoint screw clockwise
until Status Open LED turns
on.
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.
¼
B. To monitor over-current (mechanical problems, seized impeller)
Status
Open
Setpoint
Status
Closed
1. Turn setpoint screw counter
clockwise until Status Closed
LED turns on.
Troubleshooting
Status
Open
Status
Open
Setpoint
Status
Closed
Setpoint
Status
Closed
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.
¼
Problem Solution
No Reading at Controller • Check sensor calibration (see above)
• Check for control voltage at sensor (<30V)
• 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
Both LEDs are lit Setpoint screw is too far clockwise. See solution above.
reset the sensor to be most sensitive. Repeat calibration above.
Z201499-0B Page 3 of 4 ©2014 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 04142
Alta Labs, E nercept, Ensp ector, Hawkeye, Trus tat, Aerospo nd, Veris, and th e Veris ‘V’ log o are tradema rks or registe red tradema rks of Veris Ind ustries, L. L.C. in the USA and /or other countri es.
Other companies’ trademarks are hereby acknowledged to belong to their respective owners.
Find Quality Products Online at: sales@GlobalTestSupply.com
www.GlobalTestSupply.com
Z201499-0B Page 4 of 4 ©2014 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 04142
Alta Labs, E nercept, Ensp ector, Hawkeye, Trus tat, Aerospo nd, Veris, and th e Veris ‘V’ log o are tradema rks or registe red tradema rks of Veris Ind ustries, L. L.C. in the USA and /or other countri es.
Other companies’ trademarks are hereby acknowledged to belong to their respective owners.
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