Toshiba PDP002Z - Manual (Page 15)

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5.1. f851: Communication Loss Action Setting (Network breaks)
This parameter sets up the VF-AS1/PS1 response to a loss of communications with the
PROFIBUS network. (On some occasions, the master side will need to be configured.)
0: Stop and break of connection
The inverter decelerates the motor to a stop and gives the  alarm.
Commands entered through the network are canceled, and the commands set with
parameters cmod and fmod become effective.
When communications are restored, the  alarm is turned off.
1: None
The inverter remains in the state where it was when the problem arose, and it gives the

alarm.
2: Deceleration stop
The inverter decelerates the motor to a stop and gives the  alarm. Commands
entered through the network are not canceled.
3: Coast stop
The inverter issues a command for a frequency of 0Hz and gives the  alarm.
Commands entered through the network are not canceled.
4: Emergency stop
The error message err8 is displayed. Commands entered through the network are
not canceled.
When communications are restored, the inverter is not restored to working order and
the error message err8 does not disappear until the inverter is reset.
5: Preset speed operation command
Refer to Section 5.2
5.2. f852: Preset speed operation selection
If the communication loss action (parameter f851) is set to 5 (preset speed command),
the VF-AS1/PS1 will run at a preset speed as set up by this parameter in the case of a
communication loss (with  alarm). Commands entered through the network are not
canceled.
For example,
If the inverter is set as described below,
f851 = 5 (preset speed operation command)
f852 = 8 (preset speed operation frequency 8)
f287 (preset speed operation frequency 8) = 10 (10Hz)
Operation is carried out as follows.
Network
Operation of the VF-AS1/PS1
Normal conditions ...........Operates according to commands entered through the network.
↓ ↓
communications loss ......Operates at 10Hz.
↓ ↓
Restoration......................Operates according to commands entered through the network.