Rockwell Automation Allen-Bradley PowerFlex 755T

Rockwell Automation Publication 750-PM101B-EN-P - April 2022 45
Chapter 3 PowerFlex 755T Control Block Diagrams
Figure 24 - Position Homing
Position Homing (Homing)
1 2 3 4 5 6
BA
D
C
FHEG
I
Homing Status
0 1 2 3
Home Request Home Enabled Homing At Home
1640
Home Ctrl Options
0 1 2 3 4 5 6
Find Home Home DI Home Marker Return Home Psn Redene Homing Alarm Home DI Inv
Speed
Position
Homing
1643
Find Home Speed
1644Find Home Ramp
Home Psn Actual
1648
Home Psn User
1391
PTP Command
VRef All [G3]
PRef 1 [E2]
7
Hold At Home
0:170 DI Find Home 0:172
DI Redene Psn
0:173
DI OL Home Limit
466 8
Alarm Status B
Homing Actv
1641
+
-
+
-
1697
Zero Position
PReg [B3]
1745
Position Actual
1. When Homing function is enabled, Home Psn Actual ( 1647) is loaded with Position Fb (1746) . 2. When Homing function is complete, Zero Position ( 1697) is loaded with Home Psn Actual [1647] - Home Psn User [1648].Then Position Actual [1745]
is loaded with Position Fb [1746] - Zero Position [1697]. 3. When Position Redene is enabled, Home Psn Actual [1647] is loaded with Position Fb [1746] . 4. Parameter P1649 to P1655 are only applicable while performing Home to
Torque operation. 5. If Home Oset (1652) is non – zero, than the Home Psn Actual [1647] =
[Position Fb [1746] / Marker Psn] +/- Home Oset (1652). Once Torque Reference > Home Torq Thresh (1649), the drive ramps down to point b after Home Torq Time (1651) expires. Drive performs PTP move to go back to Home
Psn Actual [1647], which is point c.
6. If Home Oset (1652) is zero, than
Home Psn Actual [1647] = [Position Fb
[1746] / Marker Psn] . Once Torque
Reference > Home Torq Thresh (1649), the drive ramps down to point b after Home Torq Time (1651) expires. It stays at point b and drive does not perform any PTP move. 7. If Home Ctrl Option (1640) bit 1 –
Home DI and bit 8 – Home Torque are set and user sets or toggle bit 0 – Find Home from 0 to 1, drive does not generate Home Request. It will generate Type 2 Alarm – Invld Homing Cnfg .
PReg [B3]
Fdbk [H4]
VRef Homing
0:171 DI Return Home
1647
1746
Position Fb
a
b
c
8
Home Torque
1649
Home Torq Thresh
1650
Home Torq Limit
1651
Home Torq Time
1652
Home Oset
1653
Home Return Spd
1654
Home Accel
1655
Home Decel
Homing Event
Overview VarCtrl PFC Vector Overview PRef Move Prof Ind 2 VelRefCAM Ld Obs Cur IPM MOP Logic Metering DroopCtrl CurPwrLmt Freq Overview PRef2 Roll Psn VRef Vect Friction Comp Proc 1 22Series IO Digital Invert PLL DBC CurrCtrl CBI Metering PReg Spindle Ref Move Trq RefCAM Proc 2 22Series IO Digital Motor I2T PwrLoss VoltRefGen LscCtrlCfg Fdbk Psn PLL VRef Overview VReg Vect Trq Ref AntiSway 11-Series IO Digital High Speed Wizard LscData VoltCtrl DriveDerating Homing Psn CAM VRef Sel Trq Overview Trq Filt Oil Well 1 22-Series IO Analog CurRefGen DCBusObs PRef1 Prof Ind 1 VRef All Trq Ref Sel Cur IM SPM Oil Well 2 22-Series IO Analog Homing