Introduction
CM-2201/CM-2202
©2018 Nelson Heat Tracing Systems
www.nelsonheaters.com
GA2497 Rev.6
4
1.0
Introduction
The Nelson Heat Trace CM-2201 is designed to monitor and
control one heating circuit in ordinary and Class I, Division 2,
Class I, Zone 2, and Zone 2 hazardous locations.
The CM-2202 can monitor/control two heating circuits in
those same locations.
This manual provides information pertaining to the
installation, operation, testing, communications and
maintenance of these controllers. See Appendix A for
detailed specifications
1.1
Getting Started
The CM-2201/CM-2202 is typically connected to external
RTDs, power or communication based on Appendix B and
C. Detailed set-up of the operating/control/monitoring
program is entered throughout the following sections.
For addition help, call Nelson technical support or follow the
Troubleshooting section.
General Application Information
CM-2201/CM-2202
2.0
General Application Information
The CM-2201/CM-2202 are designed to operate on input
voltages between100and277Vacand50/60Hz. Load
switching is handled by a 2-Pole solid-state relay and can
control resistive loads of 30A continuous @ 40°C
ambient.
The CM-2201/CM-2202 are designed to control heating
circuits by monitoring one or two temperature inputs for
each circuit via industry standard 3-wire, 100Ω, Platinum
RTDs. The two separate RTDs for each circuit maybe
utilized to customize the temperature control inputs.
Several different modes are user selectable as well as the
sensor failure operational mode.
TheCM-2201 and CM-2202 can be operated in
temperatures of -40°F to +104°F (-40°C to +40°C)
.
