Mitsubishi Electric FR-A700 Instruction Manual page 499

Parameter
To display the machine speed, set in Pr. 37 the machine speed for operation with frequency set
in Pr. 505. For example, when Pr. 505 = "60Hz" and Pr. 37 = "1000", "1000" is displayed on the
running speed monitor when the running frequency is 60Hz. When running frequency is 30Hz,
"500" is displayed.
When displaying the motor speed, set the number of motor poles (2, 4, 6, 8, 10) or number of
motor poles + 100 (102, 104, 106, 108, 110) in Pr. 144.
The Pr. 144 setting is automatically changed if the number of motor poles is set in Pr.81 Number
of motor poles. The Pr. 81 setting is not automatically changed even if the setting of Pr. 144 is
changed.
● Example 1: When the initial setting of Pr. 81 is changed to "2" or "12", the Pr. 144 setting
changes from "4" to "2".
● Example 2: When Pr. 144 = "104", setting "2" in Pr. 81 changes the Pr. 144 setting from
"104" to "102".
When "1, or 11" is set in Pr. 811, the setting increments of speed setting from the PU, speed set-
ting from RS-485 communication or communication options (other than FR-A7ND, FR-A7NL,
FR-A7NCA) and running speed monitor is 0.1r/min.
When both Pr. 37 and Pr. 144 have been set, their priorities are as given below.
Pr. 144, 102 to 110 > Pr. 37, 1 to 9998 > Pr. 144, 2 to 10
When the running speed monitor is selected, each monitor and setting are determined by the
combination of Pr.37 and Pr. 144 as listed below. (The units within the grayed line shown in Tab.
6-91 are the initial values.)
Pr. 37
0
(initial
value)
1–9998
Tab. 6-91: Setting range of parameter 37 and 144
Motor speed (r/min) conversion formula: frequency × 120/number of motor poles (Pr. 144)
Machine speed conversion formula: Pr. 37 × frequency/Pr. 505Hz
For Pr. 144 in the above formula, the value is "Pr. 144 − 100" when "102 to 110" is set in
Pr. 144 and the value is "4" when Pr. 37 = 0 and Pr. 144 = 0.
Hz is in 0.01Hz increments, machine speed is in 1m/min increments, and r/min is in 1r/min
increments.
Pr. 505 is always set as frequency (Hz).
FR-A700 EC
Output Frequency
Pr. 144
Monitor
0 Hz
2–10 Hz
102–110 r/min
0 Hz
2–10 Machine speed
102–110 Hz
Monitor display and monitor output signals
Set Frequency Running Speed
Monitor Monitor
Hz r/min
Hz r/min
r/min r/min
Hz Machine speed
Machine speed Machine speed
Hz r/min
Frequency Setting
Parameter Setting
Hz
Hz
r/min
Hz
Machine speed
Hz
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