Emerson 3401 - IGBT Junction Temperature; Drive Thermal Protection Accumulator; Power Circuit Temperature 3

Menu 7 Introduction
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Advanced parameter
descriptions
108 Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 9
Analog output terminal update rate is 21ms.
The IGBT junction temperature is calculated using Heatsink 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 80).
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 O.ht3 trip is initiated.
This parameter displays the temperature on the input rectifier on Commander SK size 6 only.
0Fr
Frequency output, Pr 7.19 = Pr 2.01 (Post ramp reference)
0V represents 0Hz/0rpm
+10V represents the value of Pr 1.06 (Maximum set speed clamp)
1Ld
Load output, Pr 7.19 = Pr 4.02 (Active current)
2A0 to 200% output current = 0 to 10V
3Por
Where:
AC_VOLTAGE_MAX = 0.7446 x DC_VOLTAGE_MAX
7.34 IGBT junction temperature
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range ±200 °C
Update rate Background
7.35 Drive thermal protection accumulator
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111 1
Range 0 to 100%
Update rate Background
7.36 Power circuit temperature 3
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range -128°C to 127°C
Update rate Background
NOTE
V
out
Active current
2 Drive rated active current×
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10×=
10V
3 AC_VOLTAGE_MAX RATED_CURRENT_MAX 2×××
1000
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=