INSTALLATION GUIDE CURRENT MONITORING TM H959 TM 959 Split-Core Current Switch, High Voltage Output, with Command Relay Installer’s Specifications Sensor Power Insulation Class Frequency Range Temperature Range Humidity Range Hysteresis Terminal Block Maximum Wire Size Terminal Block Torque (nominal) Safety Induced from monitored conductor 600VAC RMS 50/60Hz -15° to 60°C (5° to 140°F) 10-90% RH, non-condensing 10% Typical 14 AWG 4 in-lbs (0.45 N-m) UL508 open device listing Do not use the LED status indicators as evidence of applied voltage. INSTALLATION DANGER 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. Disconnect and lock out power to the enclosure containing the conductor to be monitored. 1. Locate a mounting surface for the removable mounting bracket that will allow the monitored conductor to pass through the center window when it is installed and that will keep the device at least 1/2” from any uninsulated conductors. Determine cable routing for the controller connection, allowing wiring to reach the mounting location. 2. Install mounting bracket to the chosen surface using the included screws. 3. Wire the output connections between the sensor and the controller. 4. Snap the sensor over the conductor to be monitored and clip the assembly to the mounting bracket. 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. 5. Secure enclosure and reconnect power 6. Calibrate the sensor (see Calibration section). DIMENSIONS WIRING EXAMPLE Removable Mounting Bracket CONTROLLER 1.0” (25 mm) DO (Relay 1.1” (26 mm) Coil) DI (Status) 3.1” (79 mm) Bracket can be mounted on three sides for added installation flexibility. 0.8” (21 mm) CONTROL POWER Self-gripping Iris 2.8” (70 mm) CONTACTOR Fan or Pump 1.4” (36 mm) Ø = 0.3” (8 mm) 2.5” (64 mm) 3.0” (76 mm) Motor Z201504-0C PAGE 1 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected] Use DIN Rail Mounting clip (Veris part number AH01) to mount on standard DIN rail. 01122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries. INSTALLATION GUIDE H959 TM OPERATION CALIBRATION The H959 is a current-sensitive switching device with an integrated command relay that monitors current (amperage) in the conductor passing through it. A change in amperage in the monitored conductor that crosses the switch threshold plus the hysteresis value will cause the resistance of the status output to change state, similar to the action of a mechanical switch. The integrated relay allows start/stop control. Before beginning calibration, establish normal load conditions. In this model, the setpoint is adjustable through the action of a twenty (20) turn potentiometer (see the CALIBRATION section). The status output is suitable for connection to building controllers or other appropriate data acquisition equipment operating at up to 120 volts. The H959 relay requires a 12 VDC external power supply for operation. The H959 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. OK! OK! A Then choose either A or B below. A. To monitor under-current (belt loss, coupling shear, status) ! STATUS OK! OK! A Status Open Setpoint 1. Turn setpoint screw clockwise until Status OPEN LED turns ON. STOP NOTES For load currents greater than sensor maximum rating: Use a 5 Amp (H68xx series) Current Transformer (CT) as shown. This technique can be combined with wrapping (see below) to add range for a low current load on a high current source. 240A > 135A (Sensor max.) 2. Slowly turn the screw counter‑clockwise until the Status CLOSED LED just turns ON. 3.Turn the screw an Setpoint Status Setpoint Closed additional 1/4 turn counter‑clockwise for 1/4 operational margin. + STOP B. To monitor over-current (mechanical problems, seized impeller) 300A:5A 4A STATUS ! OK! H68xx-5A CT DANGER: 5A CTs can present hazardous voltages. Install CTs in accordance with manufacturer's instructions. Terminate the CT secondary before applying current. OK! A 1.Turn setpoint screw counter‑clockwise until Status CLOSED LED turns ON. Status Setpoint Closed 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 STOP 2. Slowly turn the setpoint screw clockwise until the Status OPEN LED just turns ON. Status Open Setpoint + e.g. : 100A ÷ 4 Turns = 25 Amps max. in monitored conductor • Failure to follow these instructions can result in overheating and permanent equipment damage. Wrap the monitored conductor through the center window and around the sensor body to produce multiple turns. This increases the current measured by the transducer. Z201504-0C PAGE 2 < 2.5 A (Sensor Min.) 1/4 3. Turn the setpoint screw an additional 1/4 turn clockwise for operational margin. TROUBLESHOOTING For load currents less than sensor minimum rating: Program controller to account for the extra turns. e.g., if four turns pass through the sensor (as shown), divide the normal controller reading by 4. STOP Setpoint Problem Solution No Reading at Controller • Check sensor calibration (see above) • Check for control voltage at sensor (<120V) • Check for amperage in monitored conductor (>2.5A) • Assure that sensor core mating surfaces are clean and that the core clamp is completely closed Setpoint screw has no stops The setpoint screw has a slip-clutch at both ends of its travel to avoid damage. Twenty turns CCW will reset the sensor to be most sensitive. Repeat calibration above. Both LEDs are lit Setpoint screw is too far clockwise. See solution above. 4x 1A ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected] 01122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.
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