Hoffman Controls 610-3PH Digital Overcurrent & Temperature Motor Protector

Product Overview

The Model 610 Digital Current Monitor consists of a Kydex covered PCB (on standoffs) with a 32 character LCD display and four push buttons. The LCD screen displays 1) real time motor currents, 2) real time compressor temperatures (when activated) and 3) trip related operational information. The four push buttons allow the installer to 1) set up the control's over current trip values, 2) set up the under/over temperature trip values, 3) select the trip auto reset and alarm options and 4) select the Modbus RTU communications options. Input power is provided by 24 VAC to designated terminals on the controller. Two sets of isolated Form C (N.O./N.C.) relay contacts are also provided. The "TRIP" relay's "N.O." to "COM" contact is closed for all, powered on, conditions below the "trip level" current. This set of contacts opens after a trip occurs and when power to the controller is off. The "Alarm" relay's "N.O." To "COM" contacts may be used when an alarm output is desired. When part winding motors are used, two Model 610 Digital Current Monitors are suggested. The control circuit relays should be wired in series to assure both parts are removed from the line when either or both monitors trip. Most faults on part winding motors can be detected using a single Model 610. Complete fault protection requires two (2) Model 610s. See I&O Instructions for Part Winding Motors. When the controller circuit trips due to an over current or abnormal temperature, a red "TRIP" LED will indicate a "failsafe" condition. The LCD display will show the type of trip, the value that caused the trip, when the trip occurred and other useful information. When an alarm condition occurs, a red "ALARM" LED illuminates, indicating the "ALARM" relay has closed the "N.O." and "COM" contacts. The "ALARM" relay contacts can be used to indicate the alarm at a remote location. Carefully evaluate and correct any system fault, that caused a trip, before resetting the control. There are two methods to reset the circuit; 1) from the LCD's Home Screen, press the "MODE" button once and then press the "ENTER" button once, or 2) remotely reset the control using the Modbus interface. Resetting the control allows the motor to restart or reconnect the load.

• Field selectable current trip level adjustment from 5 to 250 amps.
• Field selectable exhaust temperature trip level adjustments from 80°F to 300°F or 100 to 20000 ohms, depending on sensor type.
• Field selectable oil temperature trip level adjustments from 20°F to 200°F or 250 to 50,000 ohms, depending on sensor type.
• Manual push button reset or Modbus RTU remote reset.
• Current transformers (C.T.s) remote from logic.
• Two isolated output Form C (N.O./N.C.) control circuits. One Trip and one Alarm.
• Accurate positive over current protection with a no nuisance trip function.
• Trips on adjustable phase imbalance for three phase systems.
• A selectable number of automatic trip resets with adjustable time delay between trip and reset.
• Detects improper phase rotation.
• All sensor readings and trip information can be read remotely over Modbus RTU and all parameters can be set over Modbus RTU.