CONTREX ML-TRIM - Manual (Page 77)

3 - 43
Performance Monitoring
Performance Monitor Parameters monitor the performance of the ML–Trim and your
system. Figure 3-2 is a block diagram of the internal control structure of the ML–Trim
and the Performance Monitor Parameters.
Lead
Frequency
(MP-41)
Feedback
Frequency
(MP-43)
Active
Scaling
(MP-50)
Master
Follower
Feedback
Scaling Tach
(MP-40)
Scaled
Reference
(MP-45)
Accel /
Decel
Ramped
Reference
(MP-46)
Deviation
(MP-44)
Trim
Output
(MP-48)
Speed Command
Out (MP-47)
Feedforward
PID Compensation
Routine
+
+
–
+
+
+
Figure 3-2 ML–Trim Internal Structure
MP-40 TACH
Tach (MP-40) is the feedback displayed in scaled Engineering Units or RPM. In the
Master mode, Tach (MP-40) will display the feedback in Master Engineering Units
(CP-20). In the Follower mode, Tach (MP-40) will display either the E.U.s/Time or the
feedback to Lead ratio in Follower Engineering Units (CP-21), depending on the value
in Display Mode Follower (CP-64). In Jog or the Direct mode, Tach (MP-40) will display
the feedback in RPMs. The feedback is read by the ML–Trim every ten milliseconds.
The readings are summed, then averaged for one second before the Tach is displayed.
MP-44 DEVIATION (ERROR)
Deviation (MP-44) displays the difference between the Ramped Reference (MP-46) and
the Feedback Frequency (MP-43) measured in units of hertz (pulses per second).
Deviation (MP-44) is not averaged or filtered; it is the ten millisecond frequency
calculation prior to the display update.