CSDSC-VFD2 Johnson Controls Current Switch

Overview

The Johnson Controls CSDSC-VFD2 is a self-calibrating current switch designed to detect proof of flow and current on variable frequency drives (VFD) and constant volume motors for fans and pumps. It automatically sets the correct threshold to eliminate false alarms from frequency variances and features a normally closed (NC) 24V command relay to facilitate control and status operations without live calibration.

Features

• Self-calibrating functionality automatically sets correct thresholds and eliminates manual calibration
• Detects motor under-current conditions such as belt loss, coupling shear, and mechanical failure
• Split-core design allows for easy installation on existing conductors without disconnecting wiring
• Integrated Normally Closed (NC) command relay rated for 10 A at 125 VAC

Specifications

• Amperage Range: 1 to 135 A
• Minimum Turn-On Amps: 1 A at 30 Hz, 1.5 A at 20 Hz, 2.5 A at 10 Hz
• Switch Load Capacity: 1.0 A at 30 VAC/DC
• Relay Coil Rating: 24 VAC/DC, 15 mA
• Frequency Range: 10 to 60 Hz
• Operating Temperature: 5 to 140°F (-15 to 60°C)

Applications

• Monitoring on/off status and proof of operation for VFD and constant volume fans and blowers
• Loss of load and mechanical failure detection in commercial HVAC systems
• Building automation system status integration for pumps and ventilation equipment