Control Techniques unidrive sp Advanced User's Manual page 253

Menus 15 to 17 Parameter Keypad and
SM-Resolver structure display
This parameter should only be set to 256 (10 bit resolution), 1,024 (12 bit resolution) or 4,096 (14 bit resolution). If the parameter is set to any other
value the drive assumes the following: 32 to 256 = 256; 257 to 1,024 = 1,024; 1,025 to 50,000 = 4,096. If the drive is operating in Closed-loop vector
or Servo modes and the resolver is selected to provide speed feedback for the drive (see Pr 3.23) then variable maximum SPEED_LIMIT_MAX is
defined as shown below.
Resolver poles Resolution
2 14
2 12
2 10
4 14
4 12
4 10
6 14
6 12
6 10
8 14
8 12
8 10
It should be noted that for a 2 pole resolver that this parameter defines the resolution over one mechanical revolution, but for a resolver with 4, 6 or 8
poles the resolution defines the resolution over an electrical revolution of the motor. For example with a 6 pole resolver (and 6 pole motor) the
1
resolution is over / of a mechanical revolution.
3
x.13 Resolver excitation
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Open-loop. Closed-loop vector, Servo,
Default
Regen
Update rate Background read
The excitation level can be controlled for use with 3:1 ratio resolvers (Pr x.13 = 0), or 2:1 ratio resolvers (Pr x.13 = 1 or 2).
x.15 Resolver poles
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Open-loop. Closed-loop vector, Servo,
Default
Regen
Update rate Background read
Resolvers with the following numbers of poles can be used with the Solutions Module.
0: 2POLE
1: 4POLE
2: 6POLE
3-11: 8POLE
A 2 pole resolver can be selected as drive speed feedback with a motor with any number of poles. A resolver with a number of poles greater than 2
can only be used with a motor with the same number of poles. If the number of resolver poles is set up incorrectly and the resolver is selected as the
drive speed feedback for motor control Solutions Module error 11 is produced.
252
Parameter Parameter
x.00 description format
SPEED_LIMIT_MAX
3,300.0
13,200.0
40,000.0
1,650.0
6,600.0
26,400.0
1,100.0
4,400.0
17,600.0
825.0
3,300.0
13,200.0
FI DE Txt VM DP ND
0 to 2
0
FI DE Txt VM DP ND
0 to 11
0
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Advanced parameter
Macros
descriptions
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Serial comms Electronic
Performance
protocol nameplate
PS
1
PS
1
Unidrive SP Advanced User Guide
Issue Number: 7
Feature look-
up table