Speed Display (Pr. 37, Pr. 144) - Mitsubishi Electric FR-A520-2.2K Instruction Manual

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Speed display (Pr. 37, Pr. 144)

Pr. 37 "speed display"
Pr. 144 "speed setting switch-over"
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 used for frequency setting can be changed from the
frequency to the motor speed or machine speed.
Parameter
Factory Setting
Number
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 half-tone screened 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 PLG 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 PLG.
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
Otherwise, the motor might run at extremely high speed, damaging the machine.
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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
the running speed and
78
PARAMETERS
Related parameters
Pr. 52 "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
0 2 to 10
1 to 9998 102 to 110
0 102 to 110
1 to 9998 0
1 to 9998 2 to 10
number of poles set are correct.