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4.3 Maintenance Data
4.3.1 MAX / MIN TEMPERATURE VALUES
MAX CONTROL TEMP
MIN CONTROL TEMP
TS 1 MAX TEMP
TS 1 MIN TEMP
TS 2 MAX TEMP
TS 2 MIN TEMP
Purpose: This feature indicates the maximum and minimum temperatures ever recorded by the
HTC since the last time the values were reset. It may be useful to log the maximum/minimum
temperatures ever experienced on a particular trace circuit for the purposes of troubleshooting
or gathering data for future design criteria. The temperature values are written to the controller’s
nonvolatile memory once every 24 hours or whenever any maintenance data is reset by the user.
maximum/minimum temperatures are recorded for
TS 1, TS 2 and the CONTROL TS.
Range: Can only be reset (cleared) by the operator.
Procedure: The maximum/minimum temperatures can be reset using the optional 920 Operator
Console (V3.11+) or a communicating device. Resetting any one of the temperatures will reset
all of them.
4.3.2 POWER ACCUMULATOR
Purpose: This feature indicates the total power consumption of the trace circuit since the last
time the
POWER ACCUMULATOR was reset. It may be useful to log the amount of power con-
sumed on a particular trace circuit for the purposes of energy management or gathering data for
future design criteria. The value of this accumulator is written to the controller’s nonvolatile
memory once every 24 hours or whenever any maintenance data is reset by the user.
Procedure: The
POWER ACCUMULATOR may be reset to zero using the optional 920 Operator
Console (V3.11+) or a communicating device.
Note: The
POWER ACCUMULATOR value will roll over to zero when the upper limit of the POWER
ACCUMULATOR
has been exceeded. This upper limit is 429,496,729.5 kW-hours for V3.00, and
214,748,364.7 kW-hours for V3.11 and up.
4.3.3 CONTACTOR CYCLE COUNTER (V3.11 AND UP)
Purpose: This feature indicates the total number of off-to-on transitions a contactor has com-
pleted since the last time the
CONTACTOR CYCLE COUNTER was reset. This serves as a method to
do preventative maintenance on the contactor according to the manufacturer’s specifications.
The count value is written to the controller’s nonvolatile memory once every 24 hours or when-
ever any maintenance data is reset by the user.
Procedure: The
CONTACTOR CYCLE COUNTER may be reset to zero using the optional 920 Opera-
tor Console or a communicating device.
Notes:
•Once the
CONTACTOR CYCLE COUNTER reaches 999,999,999 it stops counting.
• The
CONTACTOR CYCLE COUNTER is only indicated if the SWITCH CONTROL MODE is set to either
DEADBAND or PROPORTIONAL AMBIENT CONTACTOR.
4.3.4 TIME IN USE
Purpose: The purpose of this feature is to indicate the total hours of controller use since its ini-
tial operation. It may be useful to log the amount of time a controller has been in service for the
purposes of maintenance planning or reliability testing. The value of this accumulator is written
to the controller’s nonvolatile memory once every 24 hours or whenever any maintenance data
is reset by the user.
Procedure: The
IN USE hours accumulator can be reset to zero using the optional 920 Operator
Console (V3.11+) or a communicating device.
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