Mitsubishi Electric 800 Series Instruction Manual page 89

Basic operation procedure (External operation)
4.3.3
Setting the frequency with analog signals
(voltage input)
POINT POINT
• Switch ON the STF (STR) signal to give a start command.
• Use the potentiometer (frequency setting potentiometer) to give a frequency command. (by connecting it across terminals 2
and 5 (voltage input)).
[Connection diagram]
(The inverter supplies 5 V power to the frequency setting potentiometer (terminal 10).)
Forward rotation start
Reverse rotation start
Switch
Frequency setting
potentiometer
Potentiometer
Operation example
Screen at power-ON
1.
The monitor display appears.
Start
2.
Turn ON the start switch (STF or STR). [STF] or [STR] indicator is on.
Acceleration → constant speed
Turn the potentiometer (frequency setting potentiometer) clockwise slowly to full. The frequency value on the indication
3.
increases in Pr.7 Acceleration time, and "60.00 Hz" appears. [FWD] indicator is on during the forward rotation, and [REV]
indicator is on during the reverse rotation.
Deceleration
Turn the potentiometer (frequency setting potentiometer) counterclockwise slowly to full. The frequency value on the
4.
indication decreases in Pr.8 Deceleration time, and the motor stops rotating with "0.00 Hz" displayed. [FWD] or [REV]
indicator is OFF.
Stop
5.
Turn OFF the start switch (STF or STR). [STF] or [STR] indicator turns OFF.
NOTE
• When both the forward rotation switch (STF) and the reverse rotation switch (STR) are ON, the motor cannot be started. If
both are turned ON while the inverter is running, the inverter decelerates to a stop.
• Pr.178 STF terminal function selection must be set to "60" (or Pr.179 STR terminal function selection must be set to
"61"). (All are initial values.)
• When terminal 10 is used, the maximum output frequency may fluctuate in a range of ±6 Hz due to fluctuations in the output
voltage (5 ±0.5 VDC). Use Pr.125 to adjust the output frequency at the maximum analog input as required. (Refer to
402.)
• When terminal 10E is used, the maximum output frequency may fluctuate (in a range of ±2 to 3 Hz) due to fluctuations in the
output voltage (10 ±0.4 VDC). Use Pr.125 to adjust the output frequency at the maximum analog input as required. (Refer to
page 402.)
Parameters referred to
Pr.7 Acceleration time, Pr.8 Deceleration time
Pr.178 STF terminal function selection
Pr.179 STR terminal function selection
88
BASIC OPERATION
Inverter
STF
STR
SD
10
2
5
Operate at 60 Hz.
page 269
page 415
page 415
Operation
page