BONFIGLIOLI Agile Operating Instructions Manual page 249

Parameter descriptions
571
Operation Mode
61 – I²t, Multi-Motor Operation,
Warning and Error Switch Off
62 – I²t, Single-Motor,
Warning and Error Switch Off
608 Thermal time constant motor
609 Thermal time constant rotor
615 Warning limit motor I
The thermal time constant of the motor is in the range from few minutes to a couple of hours.
This motor-specific parameter is set via
Substantially smaller is the thermal stator time constant. To protect the stator winding additional mon-
itoring is required which is determined by
These values can be taken from the corresponding motor data sheets.
When estimated time constants are used because the required data are not available then an optimal
thermal motor protection cannot be guaranteed.
A warning limit allows the user to prevent an imminent I²t-fault trip through appropriate measures.
615 is used to set the warning signal between 6% and 100% of thermal
2
Warning limit motor I t
capacity.
Parameters
No. Description
608 Thermal time constant Motor
609 Thermal time constant Stator
615 Warning Limit Motor I
Output signals
Digital signals signal that of the function " motor protection " has been triggered.
180 - Warning motor
protection
14 -
1)
For linking to frequency inverter functions
2)
For output via a digital output. Select the signal source for one of the parameters 531, 532, 533,
554. See chapter 7.6.5 "Digital outputs".
Special functions
The I²t capacity of the motors regarding their relat-
ed ratings is monitored in each of the four data
sets. If the
Warning Limit Motor I
the warning message "A0200" is signaled from the
active data set. If the fixed threshold values exceed
100% (120%
motor
fault "F0401" in the active dataset. Both incidences
are triggered from the active dataset.
The I²t capacity of the motor is monitored with rat-
ed values from the active dataset.
If the
Warning Limit Motor I
warning message "A0200" is signaled from the ac-
tive data set. If the fixed threshold values exceed
100% (120%
motor
fault "F0401" in the active dataset. Both incidences
are triggered from the active dataset.
2
t
T hermal time constant motor
Thermal time constant stator
Control level
1 in AGL
3 in ACU
1 in AGL
3 in ACU
2
t 1 in AGL
3 in ACU
1)
Triggering of the function " motor protection " according to
571 is signaled.
2)
Mode
249
Function
615 is reached,
2
t
), the drive switches off with
stator
615 is reached, the
2
t
), the drive switches off with
stator
608.
609.
Min Max
1 min 240 min
1 s 600 s
6% 100%
06/2013 Operating Instructions
Setting
Fact. setting
30 min
15 s
80%
Operation
Agile