Menus 15 to 17
SM-Encoder Pl
Parameter
structure
Keypad and
display
Parameter
x.00
Parameter
description format
Advanced parameter
descriptions
Macros
Serial comms
protocol
Electronic
nameplate
Performance RFC mode
284
Unidrive SP Advanced User Guide
www.controltechniques.com Issue Number: 10
The update time for some functions are affected by the number of dumb Solutions Modules installed to the drive. The update time for these functions
is the sum of the update times for all dumb Solutions Modules installed to the drive, called the combined update time. The update time for the SM-
Encoder Plus, SM-Encoder Output Plus and SM-Resolver modules is 4ms, and the update time for the SM-I/O Plus is 8ms.
For example, if a module with 4ms update time and a module with 8ms are installed to the drive, then the combined update time for the time critical
parameters of each module is 12ms.
Some functions with the SM-Encoder plus and SM-Encoder Output Plus modules do not function correctly if the update time is too long. The input
frequency should not exceed 500kHz, but in addition the number of encoder counts seen over one sample period should not exceed 32768. Provided
the frequency is within the 500kHz limit, the maximum count cannot be exceeded with Fd and Fr encoders with any sample time, or with Ab encoders
if the sample time is 16ms or less. If the sample time is 20ms then the maximum allowed frequency with Ab encoders is 409.6kHz.
Position/speed feedback update rate
If the module is selected for motor control position feedback then the position and speed parameters are updated as defined with each parameter, but
are available within the drive at a faster rate as shown below.
If the module is not selected for motor control position feedback the position and speed are updated as defined with the appropriate parameters.
The menu for the relevant slot appears for the new Solutions Module category with the default parameter values for the new category. When no
Solutions Module is installed in the relevant slot this parameter is zero. When a Solutions Module is installed this parameter displays the identification
code.
104: SM-Encoder Plus / SM-Encoder Output Plus
The new parameters values are not stored in EEPROM until the user performs a parameter save. When parameters are saved by the user in the drive
EEPROM the option code of the currently installed Solutions Module is saved in EEPROM. If the drive is subsequently powered-up with a different
Solutions Module installed, or no Solutions Module installed where one was previously installed, the drive gives a Slot.dF or SLot.nf trip.
Provided the set-up parameters for the position feedback are correct this parameter shows the speed in rpm.
Pr
x.04
and Pr
x.05
give the position with a resolution of 1/2
16
ths of a revolution as a 32 bit number as shown below.
Provided the set-up parameters are correct, the position is always converted to units of 1/2
16
ths of a revolution, but some parts of the value may not
be relevant depending on the resolution of the feedback device. For example if 10 bit resolution is selected the resolver produces 4,096 counts per
revolution, and so the position is represented by the bits in the shaded area only.
When the feedback device rotates by more than one revolution, the revolutions in Pr
x.04
increment or decrement in the form of a sixteen bit roll-over
counter.
Control position
Current controller sample rate
Control speed
250
μ
s
Position controller position (menu 13)
4ms
Position for SM-Applications module, etc.
250
μ
s
x.01
Solutions Module ID code
RO
Uni
PT
US
Ú
0 to 599
Ö
104
Update rate: Write on power-up
x.03
Speed feedback
RO
Bi
FI
NC
PT
Ú
±40,000.0 rpm
Ö
Update rate: 4ms x number of dumb modules
x.04
Revolution counter
RO
Uni
FI
NC
PT
Ú
0 to 65,535 revolutions
Ö
Update rate: 4ms x number of dumb modules
x.05
Position
RO
Uni
FI
NC
PT
Ú
0 to 65,535 (1/2
16
ths
revolutions)
Ö
Update rate: 4ms x number of dumb modules
31 16 15 0
Revolutions
Position
31 16 15 4 3 0
Revolutions
Position
Summary of Contents for unidrive sp
Page 419: ......
Page 420: ...0471 0002 10 ...
