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 Tabl e 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
Resolution32
0010 bits
0 1 12 bits (default setting)
1014 bits
1116 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
000 1
001 2
010 4
011 8
100 16
101 32
110 64
111 127
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