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Speed Display (pr. 37, Pr. 144) - Mitsubishi Electric FR-A500 Instruction Manual

Transistorized inverter.
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4.2.17 Speed display (Pr. 37, Pr. 144)

Pr. 37 "speed display"
Pr. 144 "speed setting switchover"
The units of the running speed monitor display of the PU (FR-DU04/FR-PU04), the running speed setting in
the PU operation mode, and the parameter setting unit used for frequency setting can be changed from the
frequency to the motor speed or machine speed.
Parameter
Factory
Number
Setting
37
0
144
4
<Setting>
• To display the machine speed, set in Pr. 37 the machine speed for 60Hz operation.
• To display the motor speed, set the number of motor poles (2, 4, 6, 8, 10) or the number of motor poles
plus 100 (102, 104, 106, 108, 110) in Pr. 144.
• When values have been set in both Pr. 37 and Pr. 144, priority is as follows:
Pr. 144 = 102 to 110 > Pr. 37 = 1 to 9998 > Pr. 144 = 2 to 10
Hence, the shaded settings in the following list become valid.
• When the running speed monitoring has been selected, the parameter setting unit and the running speed
setting unit in the PU operation mode depend on the combination of the Pr. 37 and Pr. 144 settings as
indicated below:
Running Speed
Monitor Display
Speed of 4-pole motor (r/min)
Motor speed (r/min)
Machine speed
Note: 1. In the V/F control mode, the motor speed is converted from the output frequency and does not
match the actual speed. When the advanced magnetic flux vector control mode has been
selected in Pr. 80 and 81, this display shows the calculated speed (estimated value found by
motor slippage calculation).
2. During encoder feedback control, the data displayed is the same as in advanced magnetic flux
vector control. Note that the speed displayed is the actual speed from the encoder.
3. When the running speed display has been selected with "0" set in Pr. 37 and "0" in Pr. 144, the
monitor display shows the speed reference for a 4-pole motor (1800r/min is displayed at 60Hz).
4. To change the PU main monitor (PU main display) or PU level meter (PU level display), refer to
Pr. 52 and Pr. 53.
5. As the operation panel display is 4 digits, "----" is displayed when the monitored value exceeds
"9999".
Make sure that the running speed and number of motor poles set are correct.
Otherwise, the motor might run at extremely high speed, damaging the machine.
Setting Range
0, 1 to 9998
0: Frequency setting added
0, 2, 4, 6, 8, 10, 102,
104, 106, 108, 110
Parameter Setting Unit
Running Speed Setting Unit
Hz
r/min
Hz
r/min
CAUTION
87
PARAMETERS
Related parameters
Pr. 52 "DU/PU main display data selection"
Pr. 53 "PU level display data selection"
Pr. 80 "motor capacity"
Pr. 81 "number of motor poles"
Remarks
Pr. 37 Setting
Pr. 144 Setting
0
0
1 to 9998
0
1 to 9998
1 to 9998
0
2 to 10
102 to 110
102 to 110
0
2 to 10
4

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