Igbt Junction Temperature; Drive Thermal Protection Accumulator - Control Techniques unidrive sp Advanced User's Manual

Parameter Keypad and
Menu 7
structure display
7.34

IGBT junction temperature

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate Background write
The IGBT junction temperature is calculated using Stack 1 temperature (Pr 7.04) and a thermal model of the drive power stage. The resulting
temperature is displayed in this parameter. 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 115).
7.35

Drive thermal protection accumulator

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate Background write
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.
144
Parameter Parameter
x.00 description format
FI DE Txt VM DP ND
1
±200 °C
FI DE Txt VM DP ND
1 1
0 to 100 %
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Unidrive SP Advanced User Guide
Issue Number: 7
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