Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 133)

Rockwell Automation Publication 20P-UM001I-EN-P - February 2013 133
Programming and Parameters Chapter 3
M
O
TO
R C
O
NTROL
Speed
F
eedback
455 [Spd FB Loss Lvl]
Maximum allowed value of armature voltage (as a percentage of Par 175
[Rated Motor Volt]) with less than 5% measured speed feedback (relative to
Par 162 [Max Feedback Spd]) before a Speed Feedback Loss condition (fault
or alarm) is reported.
Note: The name of this parameter was changed from [Spd Fdbk Error],
changed the default value from 22, and min./max. values from 10/100 for
firmware version 5.002.
Default:
Min/Max:
Units:
40
10 / 40
%
16-bit
Int 457,
478
457 [Spd Fdbk Control]
Enables/Disables speed feedback control. The speed feedback control
function is automatically disabled when armature voltage feedback is
selected (Par 414 [Fdbk Device Type] = 3 “Armature”).
Default:
Options:
1 =
0 =
1 =
“Enabled”
“Disabled”
“Enabled”
16-bit
Int 414,
455,
478
458 [SpdReg FB Bypass]
Enables/Disables an automatic switch to armature voltage feedback when a
“Speed Fdbk Loss” (F91) fault occurs due to a speed feedback signal loss.
When this parameter is set to “Enable”, Par 478 [Spd Loss Flt Cfg] must be set
to 1 “Alarm” to allow the motor to continue to run with no speed feedback
signal. After an automatic switch to armature feedback, the speed regulator
works with Pars 459 [SpdReg Kp Bypass] and 460 [SpdReg Ki Bypass] and the
D derivative part of the speed regulator is automatically excluded. Pars
[SpdReg Kp Bypass] and [SpdReg Ki Bypass] must be properly tuned.
Default:
Options:
0 =
0 =
1 =
“Disabled”
“Disabled”
“Enabled”
16-bit
Int 162,
459,
460,
469,
478
461 [Spd Fdbk Invert]
Enables / Disables speed feedback negation.
Note: This parameter was added for firmware version 3.001.
Default:
Options:
0 =
0 =
1 =
“Disabled”
“Disabled”
“Enabled”
16-bit
Int
562 [Anlg Tach Gain]
Fine scaling of the speed feedback received from the DC analog tachometer
(Par 414 [Fdbk Device Type] = 2 “DC Tach”). The voltage feedback value
received from the tachometer is multiplied by this value. To maximize the
feedback speed resolution, this parameter can be used to scale the voltage
setting selected with DIP switch S4 to Par 162 [Max Feedback Spd].
Default:
Min/Max:
1.0000
0.9000 / 3.0000
Real
563 [Feedback Offset]
Offset scaling of the feedback circuit. The value of this parameter applies
regardless of the type of feedback device selected in Par 414 [Fdbk Device
Type].
Note: The name of this parameter was changed from [Anlg Tach Zero] for
firmware version 3.001.
Default:
Min/Max:
Units:
0.00
–/+20.00
rpm
Real
Fil
e
Gr
oup
No
. Parameter Name & Description
See page 110 for symbol descriptions
Values Da
ta
T
yp
e
Rela
ted
A
ATTENTION: If speed feedback control is disabled (Par 457 [Spd Fdbk Control] set to 0 “Disabled”) and Par 414
[Device Type] is set to 1 “Encoder”, 2 “DC Tach”, or 4 “Resolver”, the motor could run at excessive speed or become
damaged, which could result in personal injury or destruction of equipment.
IMPORTANT If Field Weakening and Speed Reg FB Bypass
are both enabled when using a DC contactor,
the armature voltage feedback terminals A1
And A2 on the drive must be connected to the
motor terminals A1 and A2, respectively.
A
ATTENTION: The Drive can overspeed if Par 461 [Spd Fdbk Invert] is set incorrectly for your application. Failure to
observe this precaution could result in damage to, or destruction of, the equipment.