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Diagnostics
130 Unidrive SP Regen Installation Guide
www.controltechniques.com Issue Number: 2
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.
An additional thermal monitoring point is provided in UNISP6xxx and UNISP7xxx drives. The temperature is displayed in this parameter in degrees C.
See Pr 7.04 to Pr 7.06 for more details.
When analogue input 1 is calibrated the number of V to F converter counts is measured by the drive over 64ms and the result is stored in this
parameter. The maximum input frequency is 2.4MHz, and so the maximum for this parameter is 153600. If calibration is performed so that the drive
10V reference is used this parameter is zero. It should be noted that although the input frequency for a 10V input is nominally 2.0MHz the resolution
is not given by 2.0MHz x sample period, but due to the structure of the V to F system the resolution is 500kHz x sample period.
7.35 Drive thermal protection accumulator
Drive mode Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 1 1 1
Range Regen 0 to 100 %
Update rate Background
7.36 Power circuit temperature 3
Drive mode Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range Regen -128 to 127°C
Update rate Background write
7.51 Analogue input 1 full scale
Drive mode Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111 1
Range Regen 0 to 153600
Update rate Background read
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