4.2.6
Immediate Switch-off with Fault
When the time set for the fieldbus timeout 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. To clear this fault (fault 34) you must reset the inverter at the keypad, via the
terminals or the fieldbus.
IMPORTANT
This fault response will stop the drive solely by means of the mechanical brake (no ramp down) which
may subject the mechanical system 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!
4.2.7
Switching to Standard Mode
When the time set for the fieldbus timeout parameter has elapsed, the inverter will ramp down the
rapid stop ramp (
P140 T13 Stop Ramp, P141 T23 Stop Ramp) and issue a warning. This fault
response enables the user to operate the inverter via the terminal strip in the case of a fieldbus system
failure. When the time set for the fieldbus timeout parameter has elapsed, the inverter will ramp down
the rapid stop ramp (
P140 T13 Stop Ramp, P141 T23 Stop Ramp) and at the same time issue a
warning (fault 87). The inverter has then already left the fieldbus mode. After a signal transition on
the input terminal programmed to the
Controller Inhibit the inverter can then be controlled using the
digital input terminals and the analogue setpoint. To do this, proceed as follows:
1.) Fieldbus mode with input terminal
Controller Inhibit = +24 V (controller enabled on terminal
side), i.e. the inverter is controlled solely via the fieldbus.
2.) After a fieldbus timeout the terminals and the analogue input must be controlled in such a way
that after a signal transition on the
Controller Inhibit terminal the drive will travel in the desired
direction.
3.) To exit this emergency operation mode you must disconnect the inverter completely from the
supply (mains supply and 24 V supply) and then reconnect it. To avoid generating a fieldbus
timeout error again, observe the following connection sequence:
1) Connect the 24 V external supply.
2) Start the fieldbus.
3) Connect the mains supply.
4.2.8
No Response
The inverter continues to operate using the process output data last received until the bus system
will send new process output data again. No fault signal is issued.
Monitoring Functions
4
44
MOVITRAC
®
31.. Fieldbus Unit Profile
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
