Introduction Parameter x.00
Parameter
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RTU
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Commander SK Advanced User Guide 53
Issue Number: 2 www.controltechniques.com
The time for some action to be taken by the drive from cold with constant motor current is given by:
Alternatively the thermal time constant can be calculated from the trip time with a given current from
For example, if the drive should trip after supplying 150% overload for 60seconds with K = 1.05 then
The thermal model temperature accumulator is reset to zero at power-up and accumulates the temperature of the motor whilst the drive remains
powered-up. Each time parameter Pr 11.45 is changed to select a new motor, or the rated current defined by Pr 5.07 or Pr 21.07 (depending on the
motor selected) is altered, the accumulator is reset to zero.
This parameter is proportional to the length of the vector in the x axis of the reference frame and is equivalent to the reactive current (magnetising
current) in each output phase in amps.
This parameter gives an indication of the internal CURRENT_LIMIT_MAX as defined above.
This parameter gives a continuous indication of modelled motor temperature as a percentage of the trip level.
When this parameter reaches 75% (and the load is above 105%), the drive will flash 'OVLd' on the display to indicate that the motor temperature is
excessive and the motor current should be reduced to stop the drive from tripping on 'It'.
When this parameter reaches 100%, the drive will give an 'It' trip or apply a restriction on the current limit (see Pr 4.16 on page 51).
The level of the accumulator is given by:
Also see Pr 4.15 on page 51.
This parameter indicates the drive loading as a percentage of rated active current, where the 100% rated active current is Pr 5.07 x Pr 5.10.
Therefore:
A positive value in this parameter indicates motoring load and a negative value indicates a regenerating load.
4.17 Reactive current (motor magnetising current)
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 12111
Range ±DRIVE_CURRENT_MAX A
Update rate Background
4.18 Overriding current limit
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11111 1
Range 0 to TORQUE_PROD_CURRENT_MAX %
Update rate Background
4.19 Overriding accumulator
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111 1
Range 0.0 to 100.0%
Update rate Background
4.20 Percentage load
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 11111
Range ±USER_CURRENT_MAX %
Update rate Background
T
trip
- Pr 4.15()In 1
K Pr 5.07×
Pr 4.01
------------------------------
2
–×=
Pr 4.15
-T
trip
In 1
K
Overload
-----------------------------
2
–
----------------------------------------------------------=
Pr 4.15
-60
In 1
1.05
1.50
-----------
2
–
----------------------------------------- 89==
Pr 4.19
Pr 4.01
2
1e
-t Pr 4.15⁄
–()
Pr 5.07 1.05×()
2
-------------------------------------------------------------
100%×=
Pr 4.20
Motor active current (Pr 4.02) 100%×
Motor rated current (Pr 5.07)
--------------------------------------------------------------------------------------------------------
Power factor (Pr 5.10)×=
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