Maintenance Data - Pentair 920 Series Installation, Operating And Maintenance Instructions

4.3 maIntenanCe data

INDUSTRIAL HEAT TRACING SOLUTIONS
interface.
Important: The controller calculates this parameter using the voltage sensed by the switch
interface module and multiplying it by the VOLTAGE TURNS RATIO to yield an adjusted voltage
value.
4.2.8 poWer
purpose: Load power provides an indication of the average power being consumed by the
heat trace cable or the total 3-phase power being consumed by a balanced 3-phase star ("Y")
connected load.
Important:
• The controller calculates load power by multiplying the average adjusted voltage reading by the
average adjusted current reading.
• The controller may be set up to calculate total 3-phase power for a balanced star ("Y")
connected load if the 3-PHASE POWER CALCULATION parameter is enabled. In this case, total
3-phase power is calculated using the following equation:
Ptotal = √3 x I x V
phase line-line
Where I = the adjusted phase current being measured, and V
phase
voltage reading being measured. The VOLTAGE and CURRENT TURNS RATIOS affect both
calculations.
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 consumed 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.
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 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
completed since the last time the CONTACTOR CYCLE COUNTER was reset. This serves as
EN- Raychem920series-IM-H56874 05/15
= the adjusted
line-line
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