Mitsubishi Electric 800 Series Instruction Manual page 43

NOTE
• When both the forward rotation start switch (STF signal) and the reverse rotation start switch (STR signal) are turned ON, the
motor cannot be started. If both are turned ON while the inverter is running, the inverter decelerates to a stop.
• The AU signal can be assigned to another terminal. Set "4" in any parameter from Pr.178 to Pr.184 (Input terminal function
selection) to assign the function to an input terminal. (For the Ethernet model, assign the signal to terminal DI0 or DI1 using
Pr.178 or Pr.179.)
Parameters referred to
Pr.7 Acceleration time, Pr.8 Deceleration
Pr.178 to Pr.184 (Input terminal function
2.6.6 Changing the frequency (initial value: 60 Hz) at the
maximum current input (initial value: 20 mA)
• Change the maximum frequency.
The following shows the procedure to change the frequency at 20 mA from 60 Hz (initial value) to 50 Hz using a frequency
setting potentiometer for 4 to 20 mA input. Set 50 Hz in Pr.126 so that the inverter outputs 50 Hz at 20 mA input.
Operating procedure
1.
Selecting the parameter
Turn the setting dial or press the UP/DOWN key until "P.126" (Pr.126) appears.
Press the SET key to show the present set value (60.00 Hz).
2.
Changing the maximum frequency
Turn the setting dial or press the UP/DOWN key to change the value to "50.00" (50.00 Hz).
Press the SET key to confirm the setting. "50.00" blinks.
3.
Selecting the mode and the monitor item
Press the MODE key twice to select the monitor mode and to monitor a frequency.
4.
Start
Turn ON the start switch (STF or STR) to apply a 20 mA current (refer to steps 3 and 4 in 2.6.5).
Operate at 50 Hz.
NOTE
• To set the frequency at 4 mA, use the calibration parameter C5 (Pr.904).
• Other adjustment methods for the frequency setting current gain are the following: adjustment by applying a current through
terminals 4 and 5, and adjustment using a specified point without applying a current through terminals 4 and 5. (Refer to
282.)
42
2. Basic Operation
2.6 Basic operation procedure (External operation)
timepage 164
selection)page 292
60Hz
(50Hz)
Bias
C5(Pr.904)
0 20
0 4
Frequency setting signal
0 1
0 2
C6(Pr.904)
Initial value
Gain Pr.126
100%
20mA
5V
10V
C7(Pr.905)
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