Veris H934 Installation Instructions

VERIS INDUSTRIES

™

CURRENT MONITORING

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

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.

Fan or Pump

CONT ACTO R

DIGI TAL CONTR OL

Motor

(Stat us)

(Rela y

Coil)

CONTR OL POWER

VFD

Removable Mounting Bracket

Self-gripping

Iris

1.0”

(25 mm)

0.8”

(21 mm)

1.1”

(26 mm)

3.1”

(79 mm)

2.8”

(70 mm)

Ø = 0.3”

(8 mm)

1.4”

(36 mm)

2.5”

(64 mm)

3.0”

(76 mm)

Bracket can be mounted on either side for added installation ﬂexibility.

INSTALLATION GUIDE

H934

934

Split-Core Current Switch, Auto Calibrating,

with Relay and Nuisance Reduction Feature

For VFD Applications

Installer’s Speciﬁcations

Sensor Power Induced from monitored c urrent Amperage Range 3.5 - 135A Continuous Insulation Class 600VAC RMS (UL) Frequency 34 to 75 Hz (belt loss indication); 20 to 34 Hz (on/oﬀ status) Temperature Range -15° to 60°C (5° to 140°F) Humidity Range 10-90% RH non-condensing Oﬀ Delay 0 sec to 2 min. Terminal Block Maximum Wire Size 14 AWG Terminal Block Torque (nominal) 4 in-lbs (0.45 N-m) Relay 5A@250VAC, 30VDC Agency Approvals UL 508 open device listing

Speciﬁcation Note: For CE compliance, conductor sha ll be insulated according to IEC 61010‑1:2001, Installation Category III o r equivalent. The product design provi des for basic insulation only.

quick install

Disconnect and lock out power to the conductor to be monitored.1.

Choose a location for the sensor. The monitored conductor must pass through 2.

the iris, and the sensor must be at least ½” from any conductors as enclosure can reach 87°C during operation (at 60°C ambient temperature).

Wiring ExamplE

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 othe r countries.

Mount the H934 on the load side output conductor of the Variable Frequency 3.

Drive.

Install the adjustable mounting bracket to the back of the enclosure using the 4.

included screws.

Wire the status and relay coil connections between the sensor and the controller.5.

Connect the relay to the contactor.6.

Snap the sensor over the conductor to be monitored and clip the assembly to the 7.

mounting bracket on one of the three sides.

Perform the Setup (see page 2).8.

DimEnsions

Use DIN Rail

Mounting clip

(Veris part

number AH01) to

mount on stan‑

dard DIN rail.

VERIS INDUSTRIES

™

H934

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.

1 sec

1.25 sec

~0.3

sec

1 pulse per cycle = Normal Operation

2 pulses per cycle = Alarm Status

Memory Reset

Button

Status LED

Reset

Output

Status

INSTALLATION GUIDE

opEration

The H934 is a current-sensitive switching device designed for use with VFD motors. It is equipped with an auto calibration feature that allows the device to distinguish between a reduced amp draw due to normal changes in frequency and an abnormal drop due to belt loss or other mechanical failure. It also includes a SPST relay for added functionality.

A change in amperage in the monitored conductor that 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 mechanical switch. The status output is suitable for connection to building controllers or other appropriate data acquisition equipment operating at up to 30 volts. The H934 requires no external power supply to generate its output.

The H934 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.

notEs

sEtup, normal statE DEtEction

Establish normal operating conditions (clean ﬁlter, normal load)1.

Start the motor running at 35 Hz.2.

Push and hold the Memory Reset button for approximately 5 seconds (see 3.

Nuisance Reduction section, below).

Let the drive operate at this speed for 1 minute.4.

Increase to 42 Hz and run for 1 minute.5.

Increase to 49 Hz and run for 1 minute.6.

Increase to 56 Hz and run for 1 minute.7.

The H934 is now ready to monitor current values and detect belt loss from 35-75 Hz. Below 35 Hz, it will detect power on/oﬀ states.

For load currents less than sensor minimum rating:

Wrap the monitored conductor through the center hole and around the sensor body to produce multiple turns through the "window." This increases the current measured by the transducer.

Controller must be programmed to account for the extra turns. e.g., if four turns pass through the sensor (as shown) the normal controller reading must be divided by 4.

< 3.5 A (Sensor Min.)

lED Blink coDEs

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 othe r countries.

mEmory rEsEt

During setup, the H934 automatically determines the setpoint and stores it in nonvolatile memory at 70% of the measured current. The H934 will require a Memory Reset if any of the following conditions occur:

The sensor is reinstalled on a diﬀerent motor.• The motor is re-sheaved.• The system is air balanced.• The motor load changes signiﬁcantly.•

To reset the H934, follow the Memory Setup procedure, starting at Step 1.

nuisancE rEDuction FEaturE

The H934 provides a secondary setpoint option of 50% of the originally measured current. To access this feature, follow the Memory Setup procedure, but in Step 2, hold the Reset button for 10 seconds instead of 5.

trouBlEshooting

Problem Solution

No Reading at

Controller

False trips • Use the Nuisance Reduction feature, holding the Reset switch for 10

• Check for amperage in monitored conductor (>3.5A).

• Check that amperage in the monitored conductor does not exceed sensor

max (200A).

• Check to be sure that no more than 30VAC/DC or 1.0A has passed through

the contact. Voltages or currents above these levels will damage the unit.

• Assure that sensor core mating surfaces are clean and that the core clamp

is completely closed.

seconds instead of 5. This will reset the memory and decrease the setpoint from 70% of memorized current to 50%. In this mode, belt loss must cause an amperage reduction of 50% or more to be detected.

Veris H934 Installation Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual