Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 424

Pr. Name
37
Speed display
M000
505 Speed setting
M001 reference
144 Speed setting
M002 switchover
811 Set resolution
D030 switchover
*1 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.
 Indication of motor speed (Pr.37, Pr.144)
• To change the indication to the motor speed, set the number of motor poles (2, 4, 6, 8, 10, or 12) or the number of motor
poles with the addition of 100 (102, 104, 106, 108, 110, or 112) in Pr.144.
• Whenever the number of motor poles set in Pr.81 Number of motor poles is changed, the Pr.144 setting changes
automatically in conjunction with Pr.81. However, the Pr.81 setting does not automatically change when the Pr.144 setting
is changed.
Example 1) Changing the initial value of Pr.81 to "2" will change the Pr.144 setting from "4" to "2".
Example 2) Changing the Pr.81 setting to "2" while Pr.144 = "104" will change the Pr.144 setting from "104" to "102".
 Indication of machine speed (Pr.37, Pr.505)
• To change the indication to the machine speed, set a number in Pr.37 which corresponds to the speed of machine
operated 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 machine is operated at the frequency of 60 Hz. "500" is displayed while the running
frequency is 30 Hz.
 Changing the increment of the speed monitoring and setting (Pr.811)
• When Pr.811 = "1 or 11", the speed can be set in increments of 0.1 r/min on the PU, or can be set and monitored in
increments of 0.1 r/min via RS-485 communication or other communication with a corresponding communication option
installed. (The parameter setting is in 1 r/min increments.)
• For the information of the availability of changing the increments of speed setting on communication options, refer to the
Instruction Manual of each communication option.
• Refer to page 235 for details of the setting increments for the torque limit level.
 Monitoring/setting items and its increments
• When both settings of Pr.37 and Pr.144 are changed from the initial values, a precedence order for these settings is as
follows: Pr.144 = 102 to 112 > Pr.37 = 1 to 9998 > Pr.144 = 2 to 12.
• The monitoring/setting items and its increments are listed with the following matrix to show the combination of the Pr.37
and Pr.144 settings.
Initial value
Setting range
FM CA
0
0
1 to 9998
60 Hz 50 Hz 1 to 590 Hz
0, 2, 4, 6, 8, 10, 12, 102,
4
104, 106, 108, 110, 112
0
1
0
10
11
Monitoring and setting of frequency
Set a number for the speed of machine operated at the
*1
speed (frequency) set in Pr.505.
Set the reference speed (frequency) for Pr.37.
Set the number of motor poles for the indication of the
motor speed.
Speed setting, running speed
monitor increments 1 r/min
Speed setting, running speed
monitor increments 0.1 r/min
Speed setting, running speed
monitor increments 1 r/min
Speed setting, running speed
monitor increments 0.1 r/min
5.11 (M) Item and output signal for monitoring
Description
Torque limit setting
increments 0.1%
Torque limit setting
increments 0.01%
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
423