Rockwell Automation 20D PowerFlex 700S AC Drives with Phase II Control Reference Manual - Manual (Page 136)

136 Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011
Chapter 1 Detailed Drive Operation
• Bits 10…12 “SmplRate btx”, configure the sample interval for measuring
speed (see Table 22 below). Increasing the encoder sample interval
improves speed measurement near zero speed. Decreasing allows the speed
control regulator to perform with high gains at high speeds.
Table 19 - Resolution Settings
Table 20 - Resolution and Least Significant Bits Used
The following table shows the maximum RPM of the motor depending on
resolution setting:
Table 21 - Resolution and Resolver Tracking Speed
Table 22 - FIR Filter Settings
Parameter 277 [Reslvr0 Type Sel] specifies the type of resolver. [Reslvr0 Type Sel]
automatically sets parameters 272 [Reslvr0 SpdRatio] through 276 [Reslvr0
CableBal]. Parameters 273 [Reslvr0 Carrier] through 276 [Reslvr0 CableBal]
cannot be changed by the user.
Bit
Resolution 3 2
0 0 10 bits
0 1 12 bits (default setting)
1 0 14 bits
1 1 16 bits
Resolution LSB Not Used Parameter 250 Increments by
16 bits All bits used 1
14 bits 2 LSB not used 4
12 bits 4 LSB not used 8
10 bits 6 LSB not used 64
Resolution Maximum Carrier
Frequency Tracking Speed for
X1 Resolver Tracking Speed
for X2 Resolver Tracking Speed
for X5 Resolver
10 bits 34 kHz 55 K-rpm 27.5 K-rpm 11 K-rpm
12 bits 24 kHz 13.8 K-rpm 6.9 K-rpm 2.76 K-rpm
14 bits 14 kHz 3480 rpm 1740 rpm 696 rpm
16 bits 10 kHz 900 rpm 450 rpm 180 rpm
Bit 12/28 11/27 10/26 Number of Taps
0 0 0 1
0 0 1 2
0 1 0 4
0 1 1 8
1 0 0 16
1 0 1 32
1 1 0 64
1 1 1 127