Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011 77
Detailed Drive Operation Chapter 1
Example 2:
The drive is configured as a torque follower. If the mechanical connection to the
load is severed, the torque command to the drive will probably be greater than the
motor unloaded will require to maintain the system speed. This will cause the
motor speed to increase until the torque command is met. Setting parameter 335
[Abs OverSpd Lim] to the desired tolerance will cause the fault to occur when the
motor speed exceeds the limit of [Fwd Speed Lim] or [Rev Speed Lim] +/– [Abs
Overspd Lim].
Owners
Owners are status parameters that show which peripheral devices (HIMs, comm
ports, etc.) are commanding or have exclusive control of specific control
functions. The list of devices also includes the drive’s control terminal block.
Table 2 - Owner Parameters and Functions
Ownership is either exclusive, or non-exclusive:
Exclusive Ownership
Only one device at a time can control the drive and only one owner bit will be set
(=1). The following owner is exclusive:
• [Direction Owner]
Non-Exclusive Ownership
Multiple devices can simultaneously issue the same command and multiple owner
bits may be set (=1). The following owners are non-exclusive:
• [Stop Owner]
• [Start Owner]
• [Jog Owner]
• [Fault Clr Owner]
Parameter Name No. Function
[Stop Owner] 677 Indicates the ports/adapters that are presently issuing a valid stop
command.
[Start Owner] 678 Indicates the ports/adapters that are presently issuing a valid start
command.
[Jog Owner] 679 Indicates the ports/adapters that are presently issuing a valid jog
command.
[Direction Owner] 680 Indicates the ports/adapter that currently has exclusive control of direction
changes.
[Fault Clr Owner] 681 Indicates the ports/adapters that are presently issuing a valid start
command.
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