Allen-Bradley PowerFlex 527 User Manual

Rockwell Automation Publication MOTION-UM003K-EN-P - January 2019 265
Homing Chapter 12
Table 5 9 describes the scenarios whether the APR feature recovers absolute position. In each case that is marked Yes, the
APR feature restores absolute position and preserves the state of the Axis Homed bit. This mark indicates that the axis
has a machine referenced absolute position.
Table 59 - APR Recovery Scenarios
Controller Event Machine Reference Retained
Controller removal and insertion under power (RIUP) with a battery
(1)
.Yes
Controller power cycle with battery. Yes
Controller firmware update. Yes
Controller update from memory card. Yes
Swap two controllers with the same catalog numbers (memory card also
swapped).
Yes
Steps
1.Axes are homed.
2.Project is saved to memory card.
3.Axes are moved and rereferenced.
4.System is restored from memory card.
Result
The system absolute position is restored to rereferenced positions and the
Home bit remains set.
Yes
Steps
1.Axes are homed.
2.Project is saved to memory card.
3.Same memory card is used on machines 2, 3, 4, for example.
4.Axes are homed on machines 2, 3, 4, for example, at different positions.
5.System restore from memory card on each machine.
Result
The system absolute position on each machine becomes restored correctly at
its respective position and the Home bit remains set.
Yes
Change controller (memory card not swapped). No
Change controller without a memory card. No
Controller power cycle without battery. No
Controller removal and insertion under power (RIUP) without battery. No
Take the controllers out of two systems with a battery or energy storage module
and swap controller. There is no memory card on either controller.
No
1. Controller remains powered.
2. Power cycle drives.
3. Change feedback device but not motor.
No
Steps
1. Axes are homed.
2. Project is saved to a memory card.
3. Memory becomes corrupt.
4. System restores from the memory card.
Result
The system absolute position is lost, the axes must be rehomed, and the Home
bit is cleared.
No
Controller power cycle or removal and insertion under power without a battery
or energy storage module.
No
1. Controller and drives remained powered.
2. Hardware feedback failure on an axis.
No
1. Battery Backed Controller.
2. User program that runs with an axis that is not homed.
No

Allen-Bradley PowerFlex 527 Specifications

General

Brand	Allen-Bradley
Model	PowerFlex 527
Category	Controller
Language	English