Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 102)

102 Rockwell Automation Publication 20P-UM001I-EN-P - February 2013
Chapter 2 Drive Start Up
Configure the Speed Feedback Parameters
1. Access the “Speed Feedback” group.
2. Configure the following parameters:
Note: If an encoder or tachometer is used, see Drive Reference and
Feedback Scaling on page
265 for instructions on associated parameter
settings.
❏ Par 414 [Fdbk Device Type] - Select the source for motor velocity
feedback:
•
1 “Encoder”
• 2 “DC Tach”
• 3 “Armature” (default)
• 4 “Resolver”
If operating the drive in field weakening mode, Par 414 [Fdbk
Device Type] must be set to 1 “Encoder”, 2 “DC Tach”, or 4
“Resolver.”
❏ Par 457 [Spd Fdbk Control] - If you are using an encoder,
tachometer, or resolver set this parameter to 1 “Enabled” to activate
speed feedback control.
❏ If the speed feedback source is an analog tachometer, set the fine
scaling value in Par 562 [Anlg Tach Gain]. This value is used to scale
the analog tachometer feedback signal after it has been conditioned
by the drive hardware.
❏ If the speed feedback source is a digital encoder, complete the
following steps:
a. Enter the pulses per revolution from the encoder nameplate in
Par 169 [Encoder PPR]. See Speed Feedback on page
269 for
more information on setting the value of this parameter.
b. Set Par 652 [Encoder Err Chk] to 1 “Enabled” to activate
monitoring of the digital encoder signals (verifies the presence
of the A, B, A-, B-, or Z channel signals).
Par 457 [Spd Fdbk Control] must be set to 1 “Enabled” for
encoder monitoring to occur.
Switch S20 must be set correctly to prevent encoder faults. See
Table 26 on page 73 .
ATTENTION: The drive can overspeed if DIP switch S4 is set
incorrectly, or the tach is wired incorrectly. Failure to observe this
precaution could result in damage to the drive or process equipment.
See
Table 50 on page 74 .