Yaskawa P7 Metasys N2 - Manual (Page 22)

Network Connection 3-4
Cable Loss Configuration and Behavior
This section describes the configurable cable loss feature of the drive. This feature offers a user maximum flexibility in determining the
drive’s response to a loss of communication.
Drive Behavior At Loss of Communication
After some interval without receipt of a message, the drive can be configured to respond in one of the following manners:
Continue at last speed
Continue at last speed with Alarm
Continue at preset speed
Ramp to Stop with EF0 fault
Coast to Stop with EF0 fault
Emergency Stop with EF0 fault
Metasys N2 I/O
Three Metasys N2 outputs are used to select the desired behavior:
AO 21 – Cable Loss Timeout
AO 22 – Cable Loss Speed
BO 11 – Communication Fault Enable
Table 5.1 - Cable Loss Behavior Summary
Behavior H5-04
Cable Loss Timeout
(AO 121
Cable Loss Speed
(AO 22)
Communication Fault Enable
(BO 11)
Decelerate to stop (stop time in C1-02) EF0 Fault 0 Timeout Interval X On
Coast to stop EF0 Fault 1 Timeout Interval X On
Emergency stop (stop time in C1-09) EF0 Fault 2 Timeout Interval X On
Continue at last speed 3 0 X X
Continue at last speed with Alarm 3 Timeout Interval X On
Continue at preset speed with Alarm 4 Timeout Interval Preset Speed On
Notes:
1. Communication must first be established and then lost for these features to function as described. If a drive is powered-up without a cable
connected or with the master controller offline, a communications timeout does not occur.
2. For modes which describe the drive running after a communications timeout, a run command must have been issued (BO 1 = ‘On’ or BO 2 =
‘On’) prior to loss of communications. For safety purposes, the drive will not automatically restart from a stopped condition. If a user requires
the drive to restart automatically, additional external wiring is required to accomplish this (consult factory).
Upon expiration of the communications timeout interval, the FAULT LED lights and remains lit until communication is restored.
Continue at Last Speed
In this mode, Cable Loss Timeout (AO 21) is set to 0, disabling the cable loss feature. The other two settings Cable Loss Speed
(AO 22) and Communication Fault Enable (BO 11) are ignored. If communication is lost, the drive simply maintains its last
commanded state. The drive will not display an alarm or fault to indicate it has lost communication. This behavior can also be
achieved by setting parameter H5-04 to “3”. The drive will display an alarm and continue running. For this specific condition,
the Communication Fault Enable (BO 11) must be enabled and Cable Loss Timeout (AO 21) should be set to something other
than 0.
Continue at Preset Speed
In this mode, Cable Loss Timeout (AO 21) is set to the desired interval, Cable Loss Speed (AO 22) is set to the desired preset
speed and H5-04 is set to “4”. If the time between messages exceeds the timeout interval, the drive’s speed command (AO 1) is
set to the Cable Loss Speed (AO 22) and the drive continues running at this new speed. Communication Fault Enable (BO 11)
must be set to ‘On’.