Description of External Hardware Faults

At a Glance

These faults are signaled by the HD_ERR bit (%Ir.m.c.4). These faults are blocking faults and cannot be deactivated.

Emergency Stop

The following table shows the cause, the signal and the solution if an Emergency Stop fault should occur:

Cause	Open circuit between 24 V and the "Emergency Stop" input on the front panel of the module
Parameter	None
Result	Moving part is forced to stop
Indication	EMG_STP bit (%MWr.m.c.3.5) (1)
Remedy	Reestablish the input connection at 24 V then acknowledge the fault.

Drive

The following table shows the cause, the signal and the solution if a Drive fault should occur:

Cause	Open circuit between 24 V and the "Drive fault" input on the front panel of the module
Parameter	None
Result	Moving part is forced to stop
Indication	DRV_FLT bit (%MWr.m.c.3.2) (1)
Remedy	Eliminate the drive fault then acknowledge the fault

Encoder Break

The following table shows the cause, the signal and the solution if an Encoder break fault should occur:

Cause	Discrepancies in information from the encoder
Parameter	None
Result	The axis stops being referenced (in the case of an incremental encoder). Moving part is forced to stop
Indication	ENC_BRK bit (%MWr.m.c.3.4) (1)
Remedy	Reestablish the affected encoder link then acknowledge the fault

NOTE: When there is an encoder link fault, the module stops taking measurements. With an absolute encoder, pulse sequences stop being sent out on the CLK line, until the fault disappears and is acknowledged.

Analog Output Short-circuit

The following table shows the cause, the signal and the solution if an Analog output short circuit fault should occur:

Cause	Short circuit detected on one of the analog inputs of the module
Parameter	None
Result	Moving part is forced to stop
Indication	ANA_FLT bit (%MWr.m.c.3.0) (1)
Remedy	Eliminate the short circuit then acknowledge the fault

Auxiliary Output Short-circuit

The following table shows the cause, the signal and the solution if an Auxiliary output short-circuit fault should occur:

Cause	Short circuit detected on one of the auxiliary outputs of the module
Parameter	None
Result	Moving part is forced to stop
Indication	AUX_FLT bit (%MWr.m.c.3.1) (1)
Remedy	Eliminate the short circuit then acknowledge the fault.

Encoder Supply

The following table shows the cause, the signal and the solution if an Encoder supply fault should occur:

Cause	There is no longer any power supplied to the encoder
Parameter	None
Result	The axis stops being referenced (in the case of an incremental encoder). Moving part is forced to stop
Indication	ENC_SUP bit (%MWr.m.c.3.3) (1)
Remedy	Reestablish the connection then acknowledge the fault

Absolute Encoder Frame

The following table shows the cause, the signal and the solution if an Absolute encoder frame fault should occur:

Cause	SSI Frame fault: parity or error bit
Parameter	None
Result	Moving part is forced to stop
Indication	ENC_FLT bit (%MWr.m.c.3.7) (1)
Remedy	Eliminate the fault then acknowledge the fault

24 V Supply

The following table shows the cause, the signal and the solution if an 24 V supply fault should occur:

Cause	24 V supply fault
Parameter	None
Result	Moving part is forced to stop
Indication	AUX_SUP bit (%MWr.m.c.3.6) (1)
Remedy	Reestablish the connection then acknowledge the fault

Note (1)

In order to be updated, the %MW words require a READ_STS command.