Yaskawa GPD506/P5 with Apogee FLN Option - Manual (Page 19)

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4.4 Cable Loss Behavior
This section describes the configurable cable loss feature of the option card. This feature offers a user
maximum flexibility in determining the drive’s response to a 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 frequency
• Continue at preset frequency
• Stop
• Fault (EF0)
Three points are used to select the desired behavior:
• #90 – Cable Loss Fault
• #91 – Cable Loss Frequency
• #92 – Cable Loss Timeout
The following table summarizes the settings for each type of behavior (X = don’t care):
Behavior Cable Loss
Fault
(#90)
Cable Loss Frequency
(#91)
Cable Loss Timeout
(#92)
Continue at last frequency X X 0
Continue at preset frequency Disable Preset Frequency Timeout Interval
Stop Running Disable 0 Timeout Interval
Fault (EF0) Enable X Timeout Interval
Each behavior is described in additional detail below.
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 timeout does
not occur.
2. For modes which describe the drive running after a timeout, a run command must have been issued
(#24 = ‘On’) prior to loss of communications. For safety purposes, it will not automatically start from
a stopped condition. If a user requires the drive to start automatically, additional external wiring may
be added to accomplish this (consult factory).
3. Upon expiration of the timeout interval, the FAULT LED lights and remains lit until communication is
restored.
4.4.1 Continue Running at Last Frequency
In this mode, Cable Loss Timeout (#92) is set to 0, disabling the cable loss feature. The other 2 settings
(#90, #91) are ignored. If communication is lost, the drive simply maintains its last commanded state.
4.4.2 Continue Running at Preset Frequency
In this mode, Cable Loss Timeout (#92) is set to the desired interval and Cable Loss Frequency (#91) is
set to the desired preset frequency. If the time between messages exceeds the timeout interval, the
drive’s frequency command (#60) is set to the Cable Loss Frequency (#91) and the drive continues
running at this new frequency. Cable Loss Fault (#90) must be ‘Disabled’.