Menu 7
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160 Unidrive SP Advanced User Guide
www.controltechniques.com Issue Number: 10
An offset can be added to each analog input with a range from -100% to 100%. If the sum of the input and the offset exceeds ±100% the results is
limited to ±100%.
This offers a simple control of Pr 7.19 to change the source for the analog output for use from Menu 0. When this parameter is set to 0 or 1 the drive
constantly writes Pr 5.01 or Pr 4.02 to Pr 7.19 respectively.
The IGBT junction temperature displayed in this parameter is the sum of the power circuit 1 temperature (Pr 7.04) and a thermal model of the drive
power stage. The calculated IGBT junction temperature is used to modify the drive switching frequency to reduce losses if the devices become too
hot (see Pr 5.18 on page 124).
If the temperature exceeds 135°C, the switching frequency is reduced provided that this feature has not been reached. The switching frequency can
be reduced from 12kHz to 6kHz to 3kHz, or from 16kHz to 8kHz to 4kHz. If at any time the calculated IGBT junction temperature exceeds 145°C, the
drive initiates an Ohtl.trip. Once the switching frequency has been reduced, the drive will attempt to restore the switching frequency every 20ms
provided the higher switching frequency does not raise the IGBT temperature above 135°C.
In addition to monitoring the IGBT junction temperatures the drive includes a thermal protection system to protect the other components within the
drive. This includes the effects of drive output current and DC bus ripple. The estimated temperature is displayed as a percentage of the trip level in
this parameter. If the parameter value reaches 100% an Oht3 trip is initiated.
7.31 T7 analog input 2 offset
7.32 T8 analog input 3 offset
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range
Open-loop, Closed-loop vector, Servo,
Regen
±100.0 %
Default
Open-loop, Closed-loop vector, Servo,
Regen
0.0
Update rate Background read
7.33 T9 analog output 1 control
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range
Open-loop, Closed-loop vector, Servo,
Regen
0 to 2
Default
Open-loop, Closed-loop vector, Servo,
Regen
2
Update rate Background read
Parameter value Parameter string Action
0FrWrite Pr 7.19 = Pr 5.01
1LdWrite Pr 7.19 = Pr 4.02
2 AdV No action
7.34 IGBT junction temperature
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range
Open-loop, Closed-loop vector, Servo,
Regen
±200 °C
Update rate Background write
7.35 Drive thermal protection accumulator
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 1 1 1
Range
Open-loop, Closed-loop vector, Servo,
Regen
0 to 100 %
Update rate Background write
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