Menu 7
104
Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 9
Additional monitoring is used with drive size 6 to detect failure of the power circuit cooling fan. If this fan fails, the monitoring point used to derive
heatsink temperature that is nearest the fan will raise temperature above its normal level, but not above the trip temperature for the power circuit. This
is detected and can initiate an O.ht2 trip. The trip threshold is shown below.
Table 10-11 Power circuit temperature 2 (Pr 7.05) in ºC
Table 10-12 Power circuit temperature 3 (Pr 7.36) in ºC
Drive cooling fan
The temperature from monitoring points and other actions control the drive cooling fan as follows:
1. If Pr
6.45
= 1 the fan is at full speed for at least 20 seconds.
2. If a Solutions Module indicates that it is too hot, the fan will run at full speed for at least 20 seconds.
3. For drive size D and 2, the fan is at full speed if the drive is enabled and the highest power circuit temperature (Pr
7.04
or Pr
7.05
) or the
temperature calculated for the case of the IGBT package exceeds the threshold for the drive. The fan is at its low speed if this temperature falls
5ºC below the threshold or the drive is disabled and the temperature is below the alarm level for Pr
7.04
and Pr
7.05
.
4. For drive size 3 to 6, the fan speed is controlled above its minimum level if the drive is enabled and the highest power circuit temperature (Pr
7.04
,
Pr
7.05
or Pr
7.36
) or the temperature calculated for the case of the IGBT package exceeds the lower threshold for the drive. The maximum fan
speed is reached when the highest of these temperatures exceeds the upper threshold. The fan is at its minimum speed if the drive is disabled
and the temperature is below the alarm level for Pr
7.04
, Pr
7.05
and Pr
7.36
.
The heatsink fan on Commander SK size D and 2 is a dual speed fan and on size 3 to 6 it is a variable speed fan. The drive controls the speed at
which the fan runs based on the temperature of the heatsink and the drives thermal model system.
Table 10-13 The thresholds are given in table below in ºC
Terminal T2 is a voltage/current reference input. The setting of this parameter configures the terminal for the required mode.
Drive size
Trip temperature
6
67ºC
Drive size
Trip
temperature
Trip reset
temperature
Alarm
temperature
2
100
95
95
3
98
93
94
4
78
73
72
5
78
73
72
6
78
73
72
Drive size
Trip
temperature
Trip reset
temperature
Alarm
temperature
6
85
80
80
Drive size
Fan threshold
Lower fan
threshold
Upper fan
threshold
A to D
60
2
60
3
55
70
4
55
62
5
55
62
6
55
65
7.06
Analog input 1 mode (terminal T2) {16}
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
Range
0 -20(0), 20-0(1), 4-20(2), 20-4(3), 4-.20(4), 20-.4(5), VoLt(6)
Default
4-.20(4)
Update rate
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