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5.1. f851: Communication Loss Action Setting (Network breaks)
This parameter sets up the VF-AS1 response to a loss of communications with the
PROFIBUS network.
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 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
Normal conditions........... Operates according to commands entered through the network.
↓ ↓
communications loss ...... Operates at 10Hz.
↓ ↓
Restoration.................... Operates according to commands entered through the network.
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