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Auto Calibration (H904... H934) Current Switches: Auto Calibration, VFD Operation

Current Switches: Auto Calibration, VFD Operation
Auto Calibration (H904... H934)

Hawkeye 904/934 microprocessor-based current status switches provide a unique solution for accurately monitoring status of motors controlled by variable frequency drives. The H904/934 store the sensed amperage values for normal operation at various frequency ranges in nonvolatile memory. This information allows the device to distinguish between a reduced amp draw due to normal changes in the frequency and an abnormal amp drop due to belt loss or other mechanical failures. The relay on the H934 is isolated from the current switch, and all relay connections are externally accessible on the device.

Microprocessor-based…real labor saver…No need to calibrate to detect belt loss on VFDs
• Self-adjusting trip point…factory programmed to detect belt loss undercurrent conditions
• Provides accurate status for VFD loads
• Automatically compensates for the effects of frequency and amperage changes associated with VFDs n Nuisance Reduction feature...provides a secondary setpoint option of 50% of the originally measured current
• LED indicates normal and alarm conditions
• Huge labor savings—no need to calibrate in live starter enclosures...install and go
• Available with a relay...status and control in one package, saving time and space
• Bracket can be installed in three different configurations...added flexibility Accurately detects belt loss and coupling shear on VFD driven motors
• Monitors both frequency and amperage... distinguishes normal drops in amperage due to frequency changes from abnormal drops due to mechanical failure
• Split-core design is ideal for retrofits...no need to remove conductor
• 5-year limited warranty

Select a link under the "item" tab below to order.

Cat #AMPERAGE RANGEStatus Output (max.)HousingMin. Trip PointStatus LedRelay TypeRelay Power Led
H9043.5 - 135A, 20 - 75HzN.O. 0.1A@30VAC/DCSplit-core3.5A or lessnone
H9343.5 - 135A, 20 - 75HzN.O. 0.1A@30VAC/DCSplit-core3.5A or lessSPST, N.O.
Sensor Power :
Induced from monitored conductor
Insulation Class: 600VAC RMS
Frequency Range:
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)
Agency Approvals: UL 508 open device listing


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