Mitsubishi Electric FR-V500 Instruction Manual page 103

Operation selection functions 1 (Pr. 17 to Pr. 37)
<Setting>
• To display the machine speed, set in Pr. 37 "speed display" the machine speed to be displayed during the Pr. 505
speed operation.
For example, when Pr. 505 = 1800r/min and Pr. 37 = 1000, the speed monitor displays "1000" at the operation
speed of 1800r/min. The monitor displays "500" at the operation speed of 900r/min.
• To display the motor frequency, set the number of motor poles (2, 4, 6, 8, 10) in Pr. 144.
• When the running speed monitoring has been selected, the parameter setting unit and the running speed setting
in the PU operation mode depend on the combination of the Pr. 37 and Pr. 144 settings as indicated below:
Pr. 37 Pr. 144
0
2 to 10
1 to 9998
2 to 10
CAUTION
1. When Pr. 37 and Pr. 144 are combined to select the Hz setting, the number of poles set in Pr. 144 is
used to calculate the frequency, independently of the number of motor poles (Pr. 81, Pr. 454) used for
control.
Note this when the number of motor poles (Pr. 81, Pr. 454) differs from Pr. 144.
2. When the speed setting has been selected, operation is performed at the synchronous speed.
When 4 poles and 60Hz are set, operation is performed at 1800r/min. For V/F control, the output
frequency is 60Hz.
3. To change the PU main monitor (PU main display) or PU level meter (PU level display), refer to Pr. 52
and Pr. 53.
4. As the control panel display is 4 digits, "– – – –" is displayed when the monitored value exceeds
"9999".
5. Even if the machine speed is set to be displayed, the minimum setting increments of parameter is
calculated in 1r/min (0.1r/min) increments. Therefore, the value is rounded off when it is smaller than
the minimum setting increments of the parameter.
Make sure that the settings of the running speed and number of motor poles are correct.
Otherwise, the motor might run at extremely high speed, damaging the machine.
Related parameters
• PU main monitor changing ⇒ Pr. 52 "DU/PU main display data selection" (Refer to page 97.)
• PU level meter changing ⇒ Pr. 53 "PU level display data selection" (Refer to page 97.)
• Setting of number of motor poles ⇒ Pr. 81 "number of motor poles", Pr. 454 "number of second motor poles" (Refer to page 120.)
Running Speed
Monitor
0 r/min
Hz
Pr. 144
Machine speed
0
Pr. 37
Machine speed
Pr. 37
CAUTION
Preset Speed Output Frequency
Monitor Monitor
r/min
Pr. 81, Pr. 454
Hz
Pr. 144
Machine speed
Pr. 37 Pr. 81, Pr. 454
Machine speed
Pr. 37 Pr. 81, Pr. 454
94
Running Speed
Setting/Pr. Setting
Hz
r/min
Hz Hz
Pr. 144 Pr. 144
Hz
r/min
Hz Machine speed
Pr. 37