H750

H750
INSTALLATION GUIDE
CURRENT MONITORING
TM
H758
TM
758
Solid-Core Current Switch, Adjustable Trip Point
With Command Relay
Installer’s Specifications
Amperage Range
1-135 A continuous
Sensor Power
Induced from monitored current
Insulation Class
600 VAC RMS
Frequency Range
50/60 Hz
Temperature Range-15° to 60°C (5° to 140°F)
Humidity Range
10-90% RH non-condensing
Hysteresis
10% of setpoint, typical
Terminal Block Maximum WIre Size
14 AWG
Terminal Block Torque (nominal)
4 in-lbs (0.45 N-m)
Status Output N.O. 1.0 [email protected] VAC/DC
Relay Coil
12 VDC nominal
Relay Contact
Resistive: 10 [email protected] VAC, 30 VDC; Inductive: 5 [email protected] VAC, 30 VDC
Agency Approvals
UL508 E150462
Do not use the LED status indicators as evidence of applied voltage.
The product 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.
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.
WIRING EXAMPLE
INSTALLATION
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 device at least 1/2” from any uninsulated conductors.
Determine cable routing for the controller connection, allowing wiring to reach
the mounting location.
2. Route the conductor through the sensor’s center window and slip the assembly
into the mounting bracket. Terminate the conductor. See Notes (page 2) for
currents under 1 Amp or above 135 Amps.
3. Wire the output connections to the DDC controller or switched load (solid state
contact).
4. Secure enclosure and reconnect power.
5. Calibrate the sensor (see Calibration section).
DIMENSIONS
CONTROLLER
Removable/Adjustable Mounting Bracket
DI (Status)
DO (Relay
0.9"
(23 mm)
0 0.7"
(19 mm)
Coil)
3.0"
(75 mm)
2.8"
(68 mm)
CONTACTOR
Fan or Pump
CONTROL
POWER
Motor
Z201489-0A
PAGE 1
1.1"
(27 mm)
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
H758
TM
OPERATION
CALIBRATION
The H758 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). An integrated relay allows start/
stop control. The status output is suitable for connection to building controllers or
other appropriate data acquisition equipment operating at up to 30 volts. The H758
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)
STATUS
!
DANGER: 5A CTs can present hazardous voltages.
Install CTs in accordance with manufacturer's instructions.
Terminate the CT secondary before applying current.
CAUTION
OK!
OK!
A
1. Turn setpoint screw
counter‑clockwise until Status
CLOSED LED turns ON.
Status
Setpoint Closed
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.
STOP
2. Slowly turn the setpoint screw clockwise until the Status OPEN LED just turns ON.
Status
Open Setpoint
STOP
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.)
0.5A
Z201489-0A
PAGE 2
4x
+
Setpoint
1/4
3. Turn the setpoint
screw an additional
1/4 turn clockwise for
operational margin.
TROUBLESHOOTING
Problem
Solution
No Reading at Controller
• Check sensor calibration (see above)
• Check for control voltage at sensor (<30 V)
• 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.
©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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