Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 173)

Rockwell Automation Publication 750-RM002B-EN-P - September 2013 173
Diagnostics and Protection Chapter 3
CIP Motion
When a PowerFlex 755 drive is running as a CIP Motion drive, then attribute
695 “Motor Overspeed User Limit” specifies the overspeed trip point directly.
This attribute has units of percent of motor rated speed. So, if attribute 695 is set
to 120% then the overspeed fault occurs at or above 120% rated speed.
Interior Permanent Magnet
For Interior Permanent Magnet motor control mode, an additional limit is
placed on the Speed Limit + Overspeed threshold. This threshold is not allowed
to exceed the setting in P1641 [IPM Max Spd] and is a +/- check. P1641 [IPM
Max Spd] is set to the speed at which the motor produces the voltage limit of the
drive. If the drive faults while the motor is rotating at this speed, the motor
produces a voltage at the output of the drive. This voltage could damage the drive
if the limit is exceeded. This limit is calculated while performing the rotate
portion of the Autotune tests. For example, if P1641 calculated to be 57.82 Hz,
then the overspeed limit threshold is set by the Speed Limit + Overspeed Limit
parameters and the results are limited to a value of +/- 57.82 Hz.
Password All parameter configuration settings for the drive and its connected peripherals
can be protected from unauthorized access through the keypad by using a
password.
When the host drive is password protected, parameter settings for the drive and
its connected peripherals can be viewed but not changed until after the existing
password value is entered. When attempting to edit a parameter value while
logged out, the HIM prompts you for the password before allowing access.
Password protection also applies to the following.
• Drive start-up procedure
• Factory defaults
• User sets
• Copy Cat function
For detailed instructions on enabling and disabling password protection, refer to
the PowerFlex 20-HIM-A6 and 20-HIM-C6S HIM (Human Interface Module)
User Manual, publication
20HIM-UM001 .