Setting parameters
10/05 AWB8230-1541GB
80
Three-wire control (STA – STP – F/R)
Three-wire control is a common control method for machines: Two
inputs are used for start and stop pulses and a third for selecting
the direction of rotation.
Through the digital inputs configured as STA, STP and F/R you can
operate the frequency inverter with three switches:
• STA: Start signal
• STP: Stop signal
• F/R: Direction of rotation
X Configure three of the digital inputs 1 to 5 as STA, STP and F/R
by entering the following values under the corresponding PNU
(C001 to C005).
–STA: 20
–STP: 21
–F/R: 22
The frequency inverter accelerates to the reference frequency
specified with PNU A020.
X In PNU A001 enter the value 02 (reference input through
PNU A020).
X In PNU A002 enter the value 01 (start signal through digital
inputs).
X In PNU A020 enter the reference frequency.
If you want to start the inverter through the STA input, the STP
input must be enabled (inverse function, open-circuit protection).
The signal must be applied for only a short period (pulse,
f 50 ms). When the STP input is disabled, the motor stops. When
the F/R input is activated (pulse) the motor reverses.
Table 25: Three-wire control
Figure 80: Digital input 4 configured as Pulse Start (STA), digital input
5 as Pulse Stop (STP) and digital input as Reverse Direction
(F/R).
Figure 81: Function chart Pulse start STA, Pulse stop STP and Direction
Reversal F/R
h
When three-wire control is activated (STA-STP-F/R),
functions 00 (FWD) and 01 (REV) are disabled.
F/R
STP
FWD
REV
STA
f
o
Value range PNU C001 to C006 State Description
20 STA Three-wire control start signal ON Motor start through pulse
• Reference input PNU F001 or A020
• Acceleration time PNU F002
OFF No change in motor operation
21 STP Three-wire control stop signal
ON Required enable signal for motor operation.
Wire breakage causes automatic motor stop.
OFF Motor stop through pulse
(deceleration time PNU F003)
22 F/R Three-wire control, direction of
rotation
ON Anticlockwise rotating field (REV)
OFF Clockwise rotating field (FWD)
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