Menu 10 Introduction
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Parameter
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Advanced parameter
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134 Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 9
Table 10-19 HF trips
The braking IGBT continues to operate even when the drive is not enabled, and is only disabled if one of the following trips occurs or would occur if
another trip has not already become active: OI.br or It.br.
It should be noted that although the UU trip operates in a similar way to all other trips, all drive functions can still operate, but the drive cannot be
enabled. Parameter values are only loaded from EEPROM if the supply voltage is low enough for the switch mode power supply in the drive to shut
down and then it is increased to restart the drive power supplies. The only differences between UU and other trips are as follows:
1. Power down save user parameters are saved when UU trip is activated.
2. The UU trip is self-resetting when the DC bus voltage rises above the drive restart voltage level.
3. When the drive is first powered up a UU trip is initiated if the supply voltage is below the restart voltage level. This does not save power down
save parameters. If another trip occurs during power-up it is the active trip in preference to the UU trip. If this trip is cleared and the supply voltage
is still below the restart voltage threshold a UU trip is then initiated.
The following alarm warnings and display indications will flash on the right hand display when they become active.
Table 10-20 Alarm Warnings
Table 10-21 Display indications
HF fault code Reason for trip
01 to 03 Not used
04 Low DC bus at power up (on SK4, 5 and 6 - failure at power up)
05 No signal from DSP at start up
06 Unexpected interrupt
07 Watchdog failure
08 Interrupt crash (code overrun)
09 to 10 Not used
11 Access to the EEPROM failed
12 to 19 Not used
20 Power stage - code error
21 Power stage - unrecognised frame size
22
OI failure at power up - output short circuit or possible output bridge
failure
23 DSP software overrun
24 Not used
25 DSP Communications failure
26
Soft start relay failed to close, or soft start monitor failed, or braking
IGBT short circuit at power up
27 Power stage thermistor fault
28 Power circuit thermistor 2 or 3 fault/internal fan fault (size 3 only)
29 Fan failure (current too high)
30 DCCT wire break trip from power module
31 Internal capacitor bank fan failure (size 4 and larger)
32 Power circuit temperature feedback multiplexor failure
Display Condition
OVL.d
Ixt overload (see Pr 4.15, Pr 4.16 on page 68, Pr 4.19 on page 70 and
Pr 10.17 on page 131)
hot
Heatsink/IGBT temperature too high (see Pr 5.18 on page 80, Pr 5.35 on
page 82 and Pr 10.18 on page 131)
br.rS
Ixt overload on braking resistor (see Pr 10.12 on page 130, Pr 10.30 and
Pr 10.31)
Display Condition
AC.Lt
Drive is in current limit (see Pr 4.07 on page 65 and Pr 10.09 on page
130)
Lo.AC
Drive is supplied from a low voltage backup supply (Size B and C 400V
drives only) (see Pr 6.10 on page 91)
FAIL
An attempt was made to read the stick when the drive was not disabled
or tripped, or the stick is read only (see 11.42 on page 148)
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