Rockwell Automation 20D PowerFlex 700S AC Drives with Phase II Control Reference Manual - Manual (Page 143)

Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011 143
Detailed Drive Operation Chapter 1
Parameter 155 [Logic Status], bit 12 “Tach Loss Sw”, shows which speed
feedback device is currently active. A value of “0” in bit 12 indicates that the
primary speed feedback device selected in [Mtr Fdbk Sel Pri] is active. A value of
“1” in bit 12 indicates that the alternate speed feedback device selected in [Mtr
Fdbk Sel Alt] is active.
Parameter 222 [Mtr Fdbk Sel Pri] selects the primary speed feedback device. It is
not intended to use the sensorless selection as the primary (or active) speed
feedback device as there is no feedback loss detection used with sensorless
operation.
Parameter 223 [Mtr Fdbk Sel Alt] selects the alternate speed feedback device.
Any selection of feedback devices, including sensorless operation is available
providing a corresponding motor type and associated feedback device is present.
Settings for parameter 222 [Mtr Fdbk Sel Pri] and parameter 223 [Mtr Fdbk Sel
Alt]:
Parameter 224 [TachSwitch Level] sets the detection level for the automatic
speed loss switch-over routine. A drop in feedback speed at the percent of rated
speed over a 0.5 ms interval will cause a tach switch from primary to alternate
device. Setting this level lower will make the speed detection more sensitive and
lower the minimum speed at which a speed switch could occur. Setting this level
higher will make the speed switch less sensitive and raise the minimum speed for
speed switch detection.
Parameter 320 [Exception Event1], bits 2 through 5 show the error status of the
corresponding speed feedback device.
Parameter 365 [Fdbk LsCnfg Pri] and parameter 366 [Fdbk LsCnfg Alt] set the
feedback loss configuration for each feedback device. The primary feedback
device should be configured to 1 “Alarm.” The alternate feedback device should
typically be configured to 2 “FltCoastStop.”
Settings for [Fdbk LsCnfg Pri] and [Fdbk LsCnfg Alt]:
0 = Encoder 0
1 = Encoder 1
2 = Sensorless
4 = Motor Sim
5 = FB Opt Port0
2 = Encdr0 Loss
3 = Encdr1 Loss
4 = FB Opt0 Loss
5 = FB Opt1 Loss
1 = Alarm
2 = FltCoastStop