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UNIFREM v.3.41x
10 May 2017
Page 74 from 180
Name [ID]
Description
Def.
Look choises of parameter's Bit1 DS mask [553] (page 55)
BM blocking fault
[1205]
Evaluation of BM blocking fault.
Warning
Warning
Warning " W53-BM blocking (page 30)" is evaluated during BM blocking.
Fault
Fault " E47-BM blocking (page 34)" is evaluated during BM blocking.
7.5.9 FLUX BRAKING
Group of parameters number [774]
Flux Braking function settings parameters.
Flux braking is used for braking the drive when brake resistor is not connected, or to reinforce and
complement other modes of braking [376] (page 73) or dynamic deceleration Dynamic deceleration (DD)
[749] (page 72).
MENU \ SETTINGS \ CONTROL AND REGULATION \ FLUX BRAKING
Name [ID]
Description
Def.
Flux
braking
(FB) [775]
Turning on the Flux braking (FB) operation. Flux braking helps to decrease the
amount of energy flowing back to the frequency converter by converting a part of
the energy to motor heat. When increasing the DC-link voltage beyond the limit of
Operating voltage FB [776] (page 74) then the motor excitation (V/f slope or
magnetic flux) increases with an intensity proportional to the gain Flux braking gain
[777] (page 74). Higher current flows in the motor. Because of this, the drive with
this braking mode should be sufficiently temperature resistant or protected.
Turned
off
Turned off
Flux braking is turned off.
Turned on
Flux braking is turned on.
Operating
voltage
FB
[776]
Flux braking operating voltage.
580,0 V
Undervoltage
1
÷
Overvoltage
2
Value of the DC-link voltage, when the flux braking begins to operate.
1
Refer to chapter 3.1
(str. 14) by product type.
2
Refer to chapter 3.1
(str. 14) by product type.
Flux
braking
gain [777]
Setting the gain of the flux brake.
1,00
0,00 ÷ 100,00
Too high gain can cause excessive rise of the motor current, up to fault " E11-Overcurrent
(page 32)". Flux brake function is inactive when zero value is set. Correct value is selected
as a compromise, so that the braking is reliable and the motor current is not unnecessarily
high.
Filter FB [1179]
Time constant of the flux brake filter on the FB output signal.
100 ms
10 m
s ÷ 10000
ms
It helps to adjust the flux braking dynamics. In case of slow reactions, it is necessary to
increase time constant of the filter and vice versa, when oscillations occur, decrease it.
7.5.10 POWER RESTRICTION
Group of parameters number [811]
Converter power restriction conditions setting. Power restriction is used for keeping the drive in operation
during extreme load or thermal conditions.
MENU \ SETTINGS \ CONTROL AND REGULATION \ POWER RESTRICTION
Name [ID]
Description
Def.
Power restriction
(PR) [766]
Selecting the operating mode of the converter power restriction (PR). PR
starts decreasing the current restriction and prevents the occurrence of
faults that could stop the drive operation.
If it is necessary to keep the converter operating even in adverse
temperature or load conditions, it is necessary to activate the power
restriction mode.
□ From overload
After exceeding the converter overload Thermal integral INV [31] (page 24) beyond the
90% value, power will be restricted.
□ From the cooler
temperature
After exceeding the temperature Cooler temperature [74] (page 24) beyond the value
set by the parameter Cooler temperature warning [767] (page 111), power will be
restricted.
Содержание Quatrofrem Series
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