In respect of inverter responses to a fieldbus timeout a distinction is made between warnings and
faults. In both cases the red V1 LED and the fault message
Fieldbus Timeout signal an interruption
of the fieldbus communications link. While, in the case of a warning, this fault indication is
automatically cancelled when the bus system starts up again, in the case of a fault the inverter must
be completely RESET with one of the available reset options (via the keypad, terminal or fieldbus).
After a factory setting has been carried out, this parameter has the value
P572 Timeout response
Rapid stop with warning
4.2.1
Rapid Stop with Warning
When the time set for the fieldbus time-out parameter has elapsed, the inverter will ramp down the
rapid stop ramp
(P140 T13 Stop Ramp, P141 T23 Stop Ramp) and issue a warning (fault 87), which
is however automatically cleared when the fieldbus system starts up again. A manual reset of the
inverter (Reset) is not required. If the DC braking mode (P730, P733) is activated, the drive is brought
to a standstill with DC braking instead of a rapid stop.
4.2.2
Emergency Stop with Warning
As the MOVITRAC
®
31.. inverter does not support emergency stop ramps, the fault response
Rapid
Stop with Warning (
→
Section 4.2.1) will become effective.
4.2.3
Immediate Switch-off with Warning
When the time set for the fieldbus time out parameter has elapsed, the inverter will carry out an
immediate switch-off, i.e. the output stage will be disabled and the mechanical motor brake activated
immediately. Motors which are not fitted with a mechanical brake will coast to rest if this fault
response is initiated. The inverter will issue a warning (fault 87). A manual reset of the inverter (Reset)
is not required.
IMPORTANT
This fault response will stop the drive solely by means of the mechanical brake (no ramp down) which
may subject the mechanical system components to considerable stresses. Make sure that your
mechanical construction is sufficiently dimensioned to take up the loads that might occur in
connection with this fault response.
4.2.4
Rapid Stop with Fault
When the time set for the fieldbus time-out parameter has elapsed, the inverter will ramp down the
rapid stop ramp
(P140 T13 Stop Ramp, P141 T23 Stop Ramp) and issue a warning (fault 28). This
fault can only be cleared by resetting the inverter via the keypad, terminal or fieldbus. If the DC braking
mode (P730, P733) is activated, the drive is brought to a standstill with DC braking instead of a rapid
stop.
4.2.5
Emergency Stop with Fault
As the MOVITRAC
®
31.. inverter does not support emergency stop ramps, the fault response
Rapid
Stop with Fault will become effective (
→
Section 4.2.4).
4
Monitoring Functions
MOVITRAC
®
31.. Fieldbus Unit Profile
43
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