Description

Nelson’s Single Point Circuit Management System is a microprocessor-based digital control and monitoring system that has been specifically designed for stand-alone or networked electric heat tracing applications. This system provides temperature control and heater cable monitoring while communicating additional information to operations personnel such as temperature alarms, voltage, and current alarms, ground fault leakage, sensor failures, and communications failures.

Features
• Easy to Use Interface
The 2 lines, 16 characters/row, alphanumeric LCD display enables the use of English language prompts for setpoint entry and operation. There are no cryptic codes or keypress combinations to remember.

• On/Off or Proportional Control
The desired control mode can be easily selected via the front panel user interface.

• Ground Fault Alarm and Trip Settings
Separate alarm and trip settings for ground fault interrupt allow alarming of developing faults before circuit interruption.

• Dual RTD Input
The optional second RTD can easily be configured in a variety of ways, including working with one RTD/two RTDs
and High-Temperature Cutout.

• Programmable Auto Test Cycle
The user can select an interval from 1 to 24 hours to have the unit automatically check the heater operating current and ground fault conditions. This allows problems to be detected and fixed before the heating system is needed.

• Host Communications
The RS-485 ModBUS® RTU communications capability is included as a standard feature. There are no expensive
“daughter boards” or firmware updates required.

Nelson Single Point Circuit Management System CM-2201 Specification/Application

Nelson Single Point Circuit Management System CM-2202 Specification/Application