Veris H738 Installation Instructions

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.

DANGER

CURRENT MONITORING

INSTALLATION GUIDE

H738

738

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 A@30 VAC/DC Relay Coil 24 VAC/DC, 10 mA Relay Contac t Resistive: 10 A@250 VAC, 30 VDC; Induc tive: 5 A@250 VAC, 30 VDC Agency Approvals UL508 E150462

Do not use the LED status indicators as evidence of ap plied voltage. The product design provi des for basic insulation only.

INSTALLATION

Disconnect and lock out power to the enclosure containing the conductor to be monitored.

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

CONTROLLER

(Status)

(Relay

Coil)

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

Removable/Adjustable Mounting Bracket

0.9"

 0.7"

(19 mm)

(23 mm)

3.0"

(75 mm)

Alta Labs, Enercep t, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘ V’ logo are trademark s or registered tradema rks of Veris Industries, L.L .C. in the USA and /or other countri es.

CONTROL

POWER

CONTACTOR

Fan or Pump

Motor

0.2” x 0.15” slot (2x)

2.8"

(68 mm)

(95 mm)

4.2"

(106 mm)

3.8"

1.1"

(27 mm)

H738

INSTALLATION GUIDE

OPERATION

The H738 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 H738 requires no external power supply to generate its output.

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.)

300A:

CALIBRATION

Before beginning calibration, establish normal load conditions.

OK!

Then choose either A or B below.

A. To monitor under-current (belt loss, coupling shear, status)

OK!

1. Turn setpoint screw clockwise until Status OPEN LED turns ON.

2. Slowly turn the screw counter-clockwise until the Status CLOSED LED just turns ON.

Setpoint

Status Closed

OK!

STOP

Status

Open

Setpoint

1/4

STATUS

OK!

Setpoint

STOP

3.Turn the screw an additional 1/4 turn counter-clockwise for operational margin.

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.

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.

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

B. To monitor over-current (mechanical problems, seized impeller)

1/4

STATUS

OK!

STOP

3. Turn the setpoint screw an additional 1/4 turn clockwise for operational margin.

OK!

1. Turn setpoint screw counter-clockwise until Status

Setpoint

Status Closed

CLOSED LED turns ON.

2. Slowly turn the setpoint screw clockwise until the Status OPEN LED just turns ON.

Status

Setpoint

Open

Setpoint

STOP

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

Both LEDs are lit Setpoint screw is too far clockwise. See solution above.

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.

Alta Labs, Enercep t, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘ V’ logo are trademark s or registered tradema rks of Veris Industries, L.L .C. in the USA and /or other countri es.