TAC AB, Feb 2000
4:6
Special functions, P:16 -
TAC 200 User’s Manual
4.5 Power limit function
The power consumption may be measured and controlled against a preset high
limit.
As shown in the block diagram in 4.3, the power limit controller will limit the
setpoint for the supply temperature to keep the power consumption on or
below the requested value.
This symbol will flash when the power limiting controller is active.
4.5.1 Measuring the power
Digital input X3 can be used as a pulse counter. If each pulse equals a certain
amount of energy, the current power can be calculated and controlled.
P:22 Wh / pulse
or
P:23 Pulses / kWh
are used to specify the energy per pulse. The following table suggests suitable
values for some rated power levels.
Wh/pulse (P:22) Pulses/kWh (P:23) Rated power, kW
100 10 50 - 500
200 5 800 - 1000
250 4 1000 - 1200
500 2 1000 - 2500
999 1 1000 - 5000
Either P:22 or P:23 may be used, but only the latest entered value is used (and
converted to the other representation as well).
P:24 - P:29 will only appear if P:22 is grater than 0.
P:25 Current power kW
The current power consumption, using the P:26 interval, is displayed (but
cannot be changed).
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