Maintenance Data - nvent 910 Series Installation, Operating And Maintenance Instructions

6.2.8 POWER
Purpose: Load power provides an indication of the average power being consumed by the heat
trace cable .
IMPORTANT: The controller calculates load power by multiplying the average adjusted voltage
reading by the average adjusted current reading.

6.3 MAINTENANCE DATA

6.3.1 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 recorded by the
HTC since the last time the values were reset. It may be useful to log the maximum/minimum
temperatures experienced on a particular tracing circuit for the purposes of troubleshooting or
gathering data for future design criteria. The temperature values are written to the controller's
non-volatile memory once every 24 hours or whenever any maintenance data is reset by the
user. Max/min temperatures are recorded for TS 1, TS 2 and the CONTROL TS.
Range: Can only be reset (cleared) by the operator.
Procedure: The max/min temperatures may be reset using the Operator Console or a
communicating device. Resetting any one of the temperatures will reset all of them.
6.3.2 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
consumed on a particular trace circuit for the purposes of energy management or gathering of
data for future design criteria. The value of this accumulator is written to the controller's non-
volatile 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 Operator Console or a
communicating device.
IMPORTANT: The POWER ACCUMULATOR value will roll over to zero when the upper limit of
the POWER ACCUMULATOR has been exceeded. This upper limit is 214,748,364.7 kW-hours.
6.3.3 CONTACTOR CYCLE COUNTER
Purpose: This feature indicates the total number of off-to-on transitions a contactor has made
since the last time the CONTACTOR CYCLE COUNTER was reset. This serves as a method
to perform preventative maintenance on the contactor according to the manufacturer's
specifications. This count value is written to the controller's nonvolatile memory once every
24 hours or whenever any maintenance data is reset by the user.
Procedure: The CONTACTOR CYCLE COUNTER may be reset to zero using the Operator
Console or a communicating device.
IMPORTANT:
• Once the CONTACTOR CYCLE COUNTER reaches 999,999,999 it will stop counting.
• The CONTACTOR CYCLE COUNTER is only indicated if the SWITCH CONTROL MODE is set
to either DEADBAND or PROPORTIONAL AMBIENT CONTACTOR.
6.3.4 TIME IN USE
Purpose: The purpose of this feature is to indicate the total hours in use of the controller since
its initial operation. It may be useful to log the amount of time a particular controller has been
in operation 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.
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