Schneider Electric H904 Data Sheet

CURRENT MONITORING

800.354.8556

503.598.4564

www.veris.com

Off

Loss of belt/coupling shear

Off

Electrical failure

Fan/pump On

Calibrated

Trip

Point

Now you can easily detect when drive belts slip, break, or pump couplings shear. In fact, a typical HVAC motor that loses its load has a reduction of current draw of up to 50%. That's why our sensors are the industry standard for status.

9EAR

7ARRANTY



Maximize Reliability

Minimize Installed Cost

THE VFD STATUS SENSOR!

H904

U.S. Patent No. 5,705,989

The Hawkeye 904 microprocessor based current status switch provides a unique solution for monitoring status of motors controlled by variable frequency drives.

Provide accurate status on loads controlled by variable frequency drives. The H904 stores the sensed amperage values for normal operation at various frequency ranges in non-volatile memory. This information allows it to distinguish between a reduced amp draw due to normal changes in the frequency and abnormal amperage drop due to belt loss or other mechanical failures.

APPLICATIONS

 Monitoring positive status on motors controlled by variable frequency drives

 Replace pressure switches

904

Split-Core Adjustable Setpoint Digital Output VFD Current Switch

Microprocessor-based…real labor saver…No need to calibrate to detec t belt loss on VFDs

 Self-adjusting trip setpoint…factory programmed to detect belt loss

undercurrent conditions!

 Provides accurate status for VFD loads

 Automatically compensates for eﬀects of frequency and amperage changes

associated with VFDs

 LED indicates normal and alarm conditions

 Huge labor savings…no need to calibrate in live starter enclosures…

Install and go

Accurately detec ts belt loss and coupling shea r on VFD driven motors

 Monitors both frequency & amperage…distinguishes normal drops in

amperage from abnormal drops due to mechanical failure

 Split-core design is ideal for retroﬁts…no need to remove conductor

ORDERING INFORMATION

MODEL AMPERAGE RANGE OUTPUT TYPE OUTPUT RATING (MAX.) STATUS LED

H904 3.5-135A, 20-75Hz

(on/oﬀ status only 20-34Hz, belt loss detection 35-75Hz.)

ACCESSORIES

DIN Rail Clip Set...See page 234

N.O. Solid-state 0.1A@30VAC/DC

'BOPS1VNQ

$0/530-

.PUPS

7'%

$0/5"$503

H904

3.7"

(94 mm)

3.3"

(84 mm)

.2”

(5 mm)

(76 mm)

1.1"

(27 mm)

Self-gripping Iris

1.1"

(28 mm)

0.8"

(20 mm)

Removable Mounting Bracket

2.8"

(71 mm)

CURRENT MONITORING

APPLICATIONS/WIRING EXAMPLE

Monitoring Fan /Pump Motors for Positive Proof of Flow

DIMENSIONAL DRAWINGS

SPECIFICATIONS

Amperage Range 3.5-135A (at all frequenc y levels) Sensor Power Induced Output Digital switch 0.1A@30VAC/DC Insulation Class 600VAC rms Frequenc y Range 34 to 75 Hz. (belt loss indication)

20 to 34 Hz. (on/oﬀ status) Temperature Range -15° to 60°C Humidit y Range 10-90% non- condensing Trip Setpoint Self-calibrating Oﬀ Delay 0 sec to 2 min.

Do not use the LED status indicators as evid ence of applied voltage. NOTE: The H904 is not intended for use in staged pump o r variable inlet vane applications.