Main Actual Value - Leroy-Somer digitax st User Manual

Example 1 - Open loop drive
The drive maximum speed clamp (Pr 1.06) = 50Hz
The main setpoint value sent from the master to the drive is 13107
Giving:
Pr 1.21
Example 2 - Closed loop / servo drive
The drive maximum speed clamp (Pr 1.06) = 1500 rpm
The main setpoint sent from the master to the drive is 10923
Giving:
Pr 1.21
11.4

Main Actual Value

Main Actual Value is the speed feedback reference defined in the PROFIdrive profile.
It is scaled such that -32768 to +32767 is -200% to +200% of the maximum speed
clamp (Pr 1.06). The converted value is derived from:
• Pr 2.01 for open loop drive operation.
• Pr 3.02 closed loop or servo drive operating modes.
The formula used for this conversion is:
Main Actual Value
Where SF is the speed feedback parameter, i.e. Pr 2.01 or Pr 3.02 depending upon the
drive operating mode.
Example 1 - Open loop drive
The drive maximum speed clamp (Pr 1.06) = 50Hz
The drive post ramp reference (Pr 2.01) = 35 Hz
Giving:
MAV
Example 2 - Closed loop / servo drive
The drive maximum speed clamp (Pr 1.06) = 1500 rpm
The main setpoint sent from the master to the drive is 10923
Giving:
MAV
SM-PROFIBUS DP-V1 User Guide
Issue : a
×
13107 50
------------------------------ - 40,0Hz
= =
16384
×
10923 1500
------------------------------------- -
= =
16384
SF
-------------------------------------------------- -
=
Max Speed Clamp
×
35 16384
------------------------------ -
11469
= =
50
×
1250 16384
------------------------------------- -
1000rpm
= =
3000
www.leroy-somer.com
1000rpm
×
16384
63