ABB DCS550 Series, Manual

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Fault tracing
3ADW000379R0501 DCS550 Manual e e
Communication loss
The communication to several devices is supervised. Choose the reaction to a communication loss by means
of LocalLossCtrl (30.27) or ComLossCtrl (30.28):
Overview local and communication loss:
Device
Loss control Time out Related fault Related alarm
DCS Control Panel LocalLossCtrl (30.27) fixed to 5 s F546 LocalCmdLoss A130 LocalCmdLoss
DWL
R-type fieldbus
ComLossCtrl (30.28) FB TimeOut (30.35) F528 FieldBusCom A128 FieldBusCom
SDCS-COM-8 F543 COM8Com A113 COM8Com
Overview local and communication loss
Mains contactor acknowledge
When the drive is switched On (MCW bit 0), the main contactor is closed and waited for its acknowledge. If
the acknowledge is not received during 10 seconds after the On command (MCW bit 0) is given, the
corresponding fault is generated. These are:
1. F523 ExtFanAck, see MotFanAck (10.06)
2. F524 MainContAck, see MainContAck (10.21)
External fault
The user has the possibility to connect external faults to the drive. The source can be connected to DI’s or
MainCtrlWord (7.01) and is selectable by ExtFaultSel (30.31). External faults generate F526 ExternalDI. In
case inverted fault inputs are needed, it is possible to invert the DI’s.
Bridge reversal
With a 6-pulse converter, the bridge reversal is initiated by changing the polarity of the current reference - see
CurRefUsed (3.12). Upon zero current detection - see CurCtrlStat1 (6.03) bit 13 - the bridge reversal is
started. Depending on the moment, the new bridge may be “fired” either during the same or during the next
current cycle.
The switchover can be delayed by RevDly (43.14). The delay starts after zero current has been detected - see
CurCtrlStat1 (6.03) bit 13. Thus, RevDly (43.14) is the length of the forced current gap during a bridge
changeover. After the reversal delay is elapsed the system changes to the selected bridge without any further
consideration.
This feature may prove useful when operating with large inductances. Also the time needed to change the
current direction can be longer when changing from motoring mode to regenerative mode at high motor
voltages, because the motor voltage must be reduced before switching to regenerative mode.
After a command to change current direction - see CurRefUsed (3.12) - the opposite current has to be
reached before ZeroCurTimeOut (97.19) has been elapsed otherwise the drive trips with F557 ReversalTime
[FaultWord4 (9.04) bit 8].
Example:
Drive is tripping with F557 ReversalTime [FaultWord4 (9.04) bit 8]:
Bridge reversal