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SECTION 6—MONITORED PARAMETER DETAILS
6.1 INTRODUCTION
The following text provides a brief summary of each of the measured and calculated
parameters that the 910 Series Control Module provides to the user. Detailed information
regarding settings, alarms limits, etc. may be found in Section 5 of this manual.
Detailed information regarding the display of these variables using the Operator Console may
be found in Section 4.2 of this manual.
For detailed information regarding the display of these variables using the Model 780/GCC-
9000, refer to the GCC user manual.
6.2 ANALOG READINGS
6.2.1 CONTROL TEMPERATURE
Purpose: This is the temperature that the controller uses to determine whether its output
switch should be on or off. Depending on the TS CONTROL MODE setting and whether one
or two RTDs are installed, the CONTROL TEMPERATURE may be derived from TS 1 or TS 2, or
a combination of the two temperatures. See Section 5.2.11 of this manual for further details
regarding the TS CONTROL MODE settings.
6.2.2 TS 1 TEMPERATURE
Purpose: This temperature is the value that the controller is reading from the RTD connected
to its TS 1 input. Depending on the TS CONTROL MODE, it may be used to determine the
CONTROL TEMPERATURE (see Section 6.2.1 above).
IMPORTANT: If the TS 1 input is not being used by the controller, the TS 1 TEMPERATURE is
not displayed.
6.2.3 TS 2 TEMPERATURE
Purpose: This temperature is the value that the controller is reading from the RTD connected
to its TS 2 input. Depending on the TS CONTROL MODE, it may be used to determine the
CONTROL TEMPERATURE (see Section 6.2.1 above).
Note: If the TS 2 input is not being used then by the controller then the TS 2 TEMPERATURE is
not displayed.
6.2.4 LOAD CURRENT
Purpose: The LOAD CURRENT reading indicates the average current being drawn by the
heating cable.
6.2.5 RESISTANCE
Purpose: Resistance is calculated using the average adjusted voltage reading divided by the
average adjusted current reading to yield a load resistance in ohms. If the controller’s output
switch is on, but no current is present, the RESISTANCE will read “open circuit.”
IMPORTANT: If the controller’s output switch is off, the RESISTANCE will always display the
last resistance which was calculated while the output switch was last on.
6.2.6 GROUND FAULT CURRENT
Purpose: If the controller detects any leakage current in the output circuit, it will indicate the
level in milliamps.
IMPORTANT: To minimize nuisance alarms, the controller will not report a leakage current of
less than 20 mAmps.
6.2.7 VOLTAGE
Purpose: The voltage reading indicates the average circuit voltage being measured by the 910.
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