Point Setup Parameters - nvent RAYCHEM T2000 Installation, Operating And Maintenance Manual

3.4 POINT SETUP PARAMETERS

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An external programming device as mentioned in Section 1.3 of this manual must be used
to perform the proper setup of the CM 2000/CM 2000+ control module and adjust all of its
setpoints. For instructions on the operation of these external programming devices, refer to
their corresponding operating manuals.
The sections that follow explain the various setup parameters of the CM 2000/CM 2000+
control module and how they may be accessed. The first line of each section identifies the
parameter to be described. The text then proceeds with an explanation of the Purpose of
the parameter, the Range over which it may be set, the Procedure for setting or enabling the
parameter, and finally any Notes or Examples that pertain to that particular parameter.
3.4.1 ALPHA-NUMERIC TAG ASSIGNMENT
Purpose: A 19 character alpha-numeric TAG may be assigned to a control module to allow it to
be easily associated with a pipe, vessel, process, heating circuit, drawing name or number.
Setting: Any combination of 19 characters from A-Z, 0-9, "/" , "-" , "." , "(" , ")" or "#" may be used.
Procedure: Use an external programming device to enter the desired text.
3.4.2 TEMPERATURE DISPLAY UNITS
Purpose: This allows selection of the units to be used to display temperatures on the front
panel of the control module. Both the measured control temperature and the CONTROL
SETPOINT temperature will be displayed in the selected units. Degrees F or C operation is
indicated by the illumination of the corresponding temperature units LED on the right hand
side of the display (See Figure 3-1). Also, if °F is selected, then the decimal of the right-most
character will be illuminated along with the temperature value.
Setting: DEGREES F or DEGREES C
Procedure: Adjust the setting to the desired temperature units (°F or °C).
IMPORTANT:
• This setting will not affect the temperature units displayed by any external upstream
programming device except the Handheld Programmer (Model 760/HHP-9000), or the
Panel Mount Programmer (Model 761).
• To minimize possible confusion, it is recommended that the temperature units be set to use
the same units on all the control modules and all external upstream programming devices.
3.4.3 CONTROL SETPOINT TEMPERATURE
Purpose: If a control module is not configured as an ATC SLAVE, the CONTROL SETPOINT
temperature is the value at which the control module will maintain the heating circuit
temperature. The CONTROL SETPOINT temperature is compared to the actual temperature
measured by the control temperature sensor (TS). A decision is then made to turn on or turn
off the output to control power to the heating circuit.
Range: –76 to 1058°F (–60 to 570°C)
Procedure: Adjust the CONTROL SETPOINT temperature value to the desired maintain
temperature. The control module will switch the output on and off to maintain this
temperature.
IMPORTANT: See Section 5.2 of this manual for an explanation of the Proportional,
Proportional Ambient SSR, Proportional Ambient Contactor and Deadband Control algorithms.
3.4.4 SWITCH CONTROL MODE
Purpose: If a control module is not configured as an ATC SLAVE, this feature allows the
selection of the type of algorithm to be used by the control module to maintain the CONTROL
SETPOINT temperature. There are four different control algorithms available in the CM 2000+
control module and two in the CM 2000 control module: proportional, proportional ambient
SSR (CM 2000+ only), proportional ambient contactor (CM 2000+ only) and deadband. See
Section 5.2 of this manual for a complete explanation of these controlling techniques as they
are implemented in the control module.