H708 708 Adjustable Solid-Core Current Switch

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H708 708 Adjustable Solid-Core Current Switch | Manualzz
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INSTALLATION GUIDE
CURRENT MONITORING
H708
708
Adjustable Solid-Core Current Switch
Installer's Specifications
Amperage Range (@60Hz.)*
Sensor Supply Voltage
Isolation
Temperature Range
Humidity Range
Status Output Ratings
Off-state Leakage
1-135A Continuous
Induced from monitored conductor
600VAC rms. (UL) 300VAC rms (CE)
-15º to 60º C
10-90% RH non-condensing
N.O. 1.0A@30VAC/DC not polarity sensitive
0 (open switch represents 1+ MEG ohms of resistance)
*When operating at 50 Hz., low threshold may be 1.2A.
Specification Note: For CE compliance, conductor shall be insulated according to IEC 61010-1:2001, Installation
Category III or equivalent. The unit design provides for basic insulation only.
quick install
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1. Plan the installation:
Locate a mounting surface for the removable mounting bracket that will allow
the monitored conductor to pass through the iris, or "window" when it is installed
and keep the product at least 1/2" (13mm) from any uninsulated conductors (CE).
Determine cable routing for the controller connection, allowing wiring to reach the
mounting location.
2. Install mounting bracket
Drill holes to mount the bracket to the chosen surface using the included screws.
3. Wire the output connections between the sensor and the controller (solid-state
contact) or external power supply.
4. Route the wire to be monitored through the product iris and slip the assembly into
the mounting bracket.
5. Calibrate the sensor (see page 2) with the load running normally.
6. Close up and power up!
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Wiring Example
Dimensions
Adjustable Mounting Bracket
0.9"
(23 mm)
0.7" Dia
(19 mm)
Insulated Conductor Only
3.0"
(75 mm)
CONTACTOR
DDC CONTROLLER
2.8"
(68 mm)
DI
1.1"
(27 mm)
Fan or Pump
.2” x .15”
slot (2x)
3.75"
(95 mm)
4.2"
(106 mm)
Motor
Z201484-0C
PAGE ©2007 Veris Industries USA 800.354.8556 or 503.598.4564 / [email protected]
03071
H708
6%2)3).$5342)%3
INSTALLATION GUIDE
CALIBRATION
operation
OK!
The H708 is a current-sensitive switching device which monitors current (amperage)
Establish normal load conditions.
in the conductor passing through it. A change in amperage in the monitored
"
conductor which crosses the switch (setpoint) threshold plus the hysteresis value will
cause the resistance of the FET status output to change state, similar to the action of
A. To monitor under-current (belt loss, coupling shear, status)
a mechanical switch. In this model, the setpoint is adjustable through the action of a
45"564
!
twenty (20) turn potentiometer (see the CALIBRATION section). The status output is
OK!
"
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
Find Setpoint
generate its output.
adjustment screw
Turn setpoint screw clockwise until Status OPEN LED turns ON.
OK!
OK!
1.
Notes
For load currents greater than sensor maximum rating:
Use a 5 Amp (H681x series) Current Transformer (CT) as shown. External power supply
not shown.
> 135A (H708 max.)
240A
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turn the screw counter‑clockwise until the Status CLOSED LED just
2. S-l-o-w-l-y
turns ON.
4UBUVT
3. 4FUQPJOU Turn the screw an
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+
4501
300A:5A
4A
H6800-5A CT
4A
B. To monitor over-current (mechanical problems, seized impeller)
45"564
!
DANGER: 5A CTs can present hazardous voltages.
Install CTs in accordance with manufacturer's
instructions.
Terminate the CT secondary before applying current.
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OK!
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Find Setpoint
adjustment screw
4UBUVT
0QFO
Wrap the monitored conductor through the center hole and around the sensor body
to produce multiple turns
< 1.0A (sensor min.)
through the "window."
This increases the current
.5A
measured by the sensor.
4x
Z201484-0C
PAGE 1.Turn setpoint screw counter‑clockwise
until Status CLOSED LED turns ON.
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2. S-l-o-w-l-y turn the setpoint screw clockwise
until the Status OPEN LED just turns ON.
2A
+
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4501
For load currents less than sensor minimum rating:
• Controller must be
programmed to account
for the extra turns. e.g., if
four turns pass through
the sensor (as shown) the
normal reading must be
divided by 4.
OK!
"
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additional 1/4 turn
counter‑clockwise
for operational
margin.
4FUQPJOU
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 that power at the contact has not exceeded 30VDC and 1.0A
• Check for amperage in monitored conductor (> 1.0A)
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
Unit is out of calibration. Turn screw 20 turns CCW and recalibrate.
©2007 Veris Industries USA 800.354.8556 or 503.598.4564 / [email protected]
03071

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