Vonsch Quatrofrem Series, Конфигурация и диагностика

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UNIFREM v.3.41x
10 May 2017 Page 146 from 180
motor power. Because of this, UNIFREM 400 XXX frequency converters have a power restriction
functional block in their software equipment.
Power restriction function is configured in the parameter:
Parameter ID: 766
SETTINGS
– > CONTROL AND REGULATION -> Power restriction [ ]
There it is possible to activate individual sources (causes) of the power restriction or their
combinations:
From overload Thermal integral INV (ID 31) > 90 % Fault = 100 %
From cooler temp. Cooler temp. (ID 74) > C_temp warning (ID 767) Fault = 90 °C
From motor overload Temp integral MT (ID 33) > 90 % Fault = 100 %
From external temp. ETP Temp. (ID 869) > ETP Warning (ID 865) Fault = ID 866
From the power
restriction signal P[1088]) PR Signal beyond the value P[1089]
PR signal limit.
When warnings from the external thermal protection of the converter (motor) occur, power
restriction is activated. Power restriction output is the correction of the maximal current so the
corresponding displayed status values do not exceed fault level and converter operation does not
stop. Power restriction is executed by restricting the maximal current. The maximal current
controller (MCC) has to be activated and functional (ID 352).
Example: Power restriction operation from the converter overload of an undersized drive with an
induction motor
(thin line - Thermal. integral. INV, thick line
– Current MT).
8.10 Optimization
Optimization is an individual management and control block and its goal is to ensure searching and
maintaining optimal values of any displayed value or parameter of the converter by using an input
A
– Drive was running under full load,
temperature integral of the converter reached
90% level and then restricted the current so
the integral will not increase further.
B
– Drive was relieved and the integral is
decreasing. The drive is capable to generate
maximal power again.