Speed Display And Rotations Per Minute Setting - Mitsubishi Electric 800 Series Instruction Manual

5.11.1

Speed display and rotations per minute setting

The monitor display unit and the frequency setting on the operation panel can be switched to motor speed and machine
speed.
Pr. Name
37
Speed display
M000
505 Speed setting
M001 reference
144 Speed setting
M002 switchover
811 Set resolution
D030 switchover

The maximum value of the setting range differs according to the Pr.1 Maximum frequency, Pr.505 Speed setting reference, and it can be
calculated from the following formula.
The maximum value of Pr.37 < 65535  Pr.505 / Pr.1 setting value (Hz).
The maximum setting value of Pr.37 is 9998 if the result of the above formula exceeds 9998.
Display in speed (Pr.37, Pr.144)
• Set the number of motor poles (2, 4, 6, 8, 10, 12) for Pr.144, or the number of motor poles + 100 (102, 104, 106, 108, 110, 112) to
display the motor speed.
• The Pr.144 setting will change automatically when setting the motor poles with Pr.81 Number of motor poles. Pr.81 will
not automatically change when Pr.144 is changed.
Example 1) Changing the initial value of Pr.81 to "2" will change Pr.144 from "4" to "2".
Example 2) When setting Pr.81 = "2" while Pr.144 = "104", Pr.144 will change from "104" to "102".
Display in motor speed (Pr.37, Pr.505)
• To display in the machine speed, set Pr.37 to the machine speed at the frequency set in Pr.505.
• For example, when Pr.505 is set to 60 Hz and Pr.37 is set to "1000", the operation panel indicates "1000" as the monitor
value of machine speed while the output frequency is 60 Hz. "500" is displayed while the output frequency is 30 Hz.
Changing the monitored value and speed setting increment (Pr.811)
• When Pr.811 = "1 or 11", the speed setting for PU input and RS-485 communication, speed setting from communication
option and the running speed monitor will be in increments of 0.1 r/min.
• For availability of changing the speed setting increments via communication options, refer to the Instruction Manual of each
communication option.
• Refer to page 154 for details of the setting increments for the torque limit level.
(M) Monitor display and monitor output signal
Initial value Setting range
0
0
1 to 9998

60 Hz 1 to 590 Hz
0, 2, 4, 6, 8, 10, 12,
4 102, 104, 106, 108,
110, 112
0
0
1
10
11
Description
Frequency display and setting
Set the machine speed for Pr.505.
Set the reference speed for Pr.37.
Set the number of motor poles when displaying the motor
speed.
Speed setting, running
speed monitor
increments on PU, RS-
485 communication, Pr.22, Pr.812 to Pr.817
communication options
1 r/min
0.1%
0.1 r/min
1 r/min
0.01%
0.1 r/min
PARAMETERS
Torque limit setting
increments
5
GROUP
M
345