Veris Industries H-934 Switch

The Veris Industries H-934 is a specialized VFD current switch designed for precision monitoring of motors driven by variable frequency drives. Engineered with a microprocessor-based architecture, this split-core current sensor accurately distinguishes between normal amperage fluctuations caused by frequency changes and genuine belt loss detection or mechanical failures. The auto-calibration feature eliminates the need for manual setpoint adjustment in live starter enclosures, storing the motor's operating curve in non-volatile memory across a 3.5 to 135A range. With an integrated command relay, this unit provides both start/stop control and positive status feedback in a single, space-saving housing. It effectively compensates for frequency shifts between 35Hz and 75Hz, ensuring reliable performance in complex HVACR automation systems without nuisance trips. For field diagnostics, the onboard LED status indicators provide immediate visual confirmation of normal operation and alarm conditions, streamlining current monitoring for service contractors and system integrators.

Key Benefits

• Automatic Calibration: Self-adjusting trip points simplify commissioning by automatically learning the motor's load profile.
• VFD Compatibility: Advanced frequency compensation prevents false alarms during motor ramping or speed modulation.
• Split-Core Design: Facilitates fast retrofits on existing conductors without disconnecting high-voltage wiring.
• Integrated Relay: Combines status monitoring and motor control into one device, reducing cabinet space requirements.
• Mechanical Protection: Optimized to detect belt loss and coupling shear even at low load reductions.

Common Questions

How does it handle frequency changes without tripping?
The H-934 utilizes a microprocessor to map the motor’s amperage at various frequencies, allowing it to recognize that a drop in current at 35Hz is normal speed modulation rather than a mechanical failure.

Does this unit require a separate power supply?
No, the current switch portion is induced-powered directly from the monitored conductor. However, the integrated command relay requires a 24 VAC/DC coil voltage for operation.

Can it detect belt loss below 35Hz?
While the unit provides on/off status as low as 20Hz, specific belt loss detection logic is optimized for the 35Hz to 75Hz range where load drops are most distinct.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.