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13.6
Main setpoint
Main setpoint is the speed 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 then written to drive digital speed reference 1
(Pr 1.21).
The formula used for this conversion is:
Pr 1.21
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
13.7
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
90
×
Main Setpoint
Max Speed Clamp
------------------------------------------------------------------------------------------------ -
=
16384
×
13107
50
------------------------------ -
40,0Hz
=
=
16384
×
10923
1500
------------------------------------- -
=
=
1000rpm
16384
SF
-------------------------------------------------- -
=
Max Speed Clamp
×
35
16384
---------------------------- -
11469
=
=
50
www.leroy-somer.com
×
16384
SM-PROFIBUS DP-V1 User Guide
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