Heater Current Monitor Module (7-N2 or 7-HC) (Optional)
Enter the full scale rating of the current transformers used with the T48
controllers. This scales the Heater Current Monitor of the controller to
indicate directly in amperes of heater current.
Hcur - 0.0 to 999.9 amperes
Alternatively, the Heater Current Monitor may be scaled to indicate in
percent of nominal heater current (0.0 to 100.0%). This may be useful in
applications employing several controllers, each with nominal heater current
readings that are different from each other. In this case, each controller can be
scaled to indicate the same reading (100.0%), independent of each
controller’s actual heater current. For example, if using a 50 ampere current
transformer and the actual maximum heater current is 38 amperes, the Heater
Current Monitor scaling value is:
Hcur
50.0 Amperes
Amperes
100.0% 131.6==
38 0.
x
This scaling value results in a Heater Current Monitor indication of
100.0% at an actual heater current of 38 amperes.
See Alarm Action, page 39, to program a heater break alarm.
Second Linear DC Analog Output Module (8-A2) (Optional)
The Second Linear DC Analog Output provides retransmission of the
conditioned and scaled input signal independent of the Main Linear DC Output.
Second Linear DC Output Range (A2tP)
Select the type of output range:
0-10 = 0 to 10 V
0-20 = 0 to 20 mA
0-40 = 4 to 20 mA
The linear DC output range jumper must be set to match the range selected.
See Linear DC Output Jumper Selection, page 12. The linear DC output can
be re-calibrated to provide up to 5% of over range operation. See Linear DC
Output Calibration, page 71, for more details.
Second Linear DC Output Scaling Points (A2LO, A2Hl)
The output can be scaled based on the controller’s input display by use of
low and high scaling parameters. Reverse acting output is possible by
reversing the scaling points.
Factory Service Operations Module (9-FS)
The Factory Service Operations include: controller calibration, and reset
programming to factory configuration setting. Access to each operation is
protected by an access code number. Entering code 66 restores all parameters
to factory settings, the unit indicates the operation after the P button is
pressed, by displaying “rSEt” in the lower display momentarily.
Caution: Entering code 77, twice in succession, erases the controller calibration
values and defaults the values to nominal settings. Reading errors of
10%
may result. Do not perform this operation unless the controller has lost
calibration. Loss of calibration is signaled by an “E-CL” error flag at
power-up. To clear this flag, perform calibration procedure as noted in
Factory Service Operations - Calibration (9-FS), page 70. Alternatively,
“stepping” through one of the calibration procedures clears the error flag,
but does NOT validate the calibration accuracy in any manner.
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