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86 Communication profiles
Speed Actual (AC/DC drive object)
This attribute indicates the actual speed at which the drive is
operating. The units are scaled by the SpeedScale attribute of the
AC/DC drive object. See Table 4. for details.
Scalar mode
When the drive is operating in the scalar mode, the drive provides
the adapter module with a frequency actual. The ODVA AC/DC
drive profile uses rpm units for the speed actual. The ODVA Speed
Actual is calculated as follows:
where
For example, for a 4 pole 60 Hz motor (Mss = 1800 rpm) with a unit
of 1 rpm and a Drive frequency actual of 30 Hz, the ODVA Speed
Actual is:
Osa = ODVA Speed Actual
Dfa = Drive frequency actual in Hz
Us
= ODVA speed unit (see
10
ODVA SPEED SCALE
on page
41
)
Mf
= Motor nominal frequency in Hz
Mss = Motor synchronous speed in rpm (not motor nominal speed)
Us
Mf
Mss
Dfa
Osa
×
×
=
900
1rpm
60Hz
1800rpm
30Hz
Us
Mf
Mss
Dfa
Osa
=
×
×
=
×
×
=
Summary of Contents for FDNA-01
Page 2: ...List of related manuals See section Related manuals on page 16 ...
Page 4: ......
Page 14: ...14 Safety ...
Page 22: ...22 About the manual ...
Page 32: ...32 Electrical installation ...
Page 72: ...72 Start up 3 Configure the device MAC address ...
Page 76: ...76 Start up ...
Page 96: ...96 Communication profiles ...
Page 154: ...154 Communication protocol ...
Page 162: ...162 Technical data ...
Page 166: ...166 Appendix A Varying the number of drive parameters ...