Mitsubishi Electric 800 Series Instruction Manual page 326

 Override function (Pr.252, Pr.253)
• Connection example for the override function
Forward
Inverter
rotation
STF
SD
10
Override
2
setting
5
Main
(+) 1
speed (-)
• Use the override function to make the main speed changed at a specified rate.
• Set Pr.73 = "4, 5, 14, or 15" to select the override function.
• When the override function is selected, terminal 1 or 4 is used for the main speed setting, and terminal 2 is used for the
override signal. (If the main speed is not input to the terminal 1 or 4, the compensation by terminal 2 is disabled.)
• Specify the scope of override by using Pr.252 and Pr.253.
• How to calculate the set frequency for override:
Main speed setting frequency (Hz): Terminals 1 or 4 input, multi-speed setting
Compensation (%): Terminal 2 input
Set frequency (Hz) = main speed setting frequency (Hz) ×
200
150
Pr.252
100
Pr.253
50
0
0
Voltage across terminals 2 and 5 (V)
NOTE
• To use terminal 4, the AU signal needs to be turned ON.
• To make compensation input for the multi-speed operation or remote setting, set Pr.28 Multi-speed input compensation
selection = "1" (with compensation) (initial value "0").
• After changing the Pr.73 setting, check the voltage/current input switch setting. Incorrect setting may cause a fault, failure
or malfunction. (For the settings, refer to
Parameters referred to
Pr.28 Multi-speed input compensation selection
Pr.73 Analog input selection
Compensation (%)
• Example) When Pr.73 = "5"
By the terminal 1 (main speed) and terminal 2 (auxiliary) input, the setting
frequency is set as shown in the figure below.
Initial value
(50 to 150%)
2.5 5
(5) (10)
page 318.)
page 226
page 318
100(%)
90
60
45
30
15
0
0 2.5
Terminal 1 input voltage (V)
5.9 (T) Multi-Function Input Terminal Parameters
Terminal 2: 5 VDC
input (150%)
Terminal 2: 2.5 VDC
input (100%)
Terminal 2: 0 V
input (50%)
5
325
5. PARAMETERS
3
4
5
5
5
6
7
8
9
10