Section 5: Configuration of the frequency converter
An example of operation at constant speeds
Using DI5 and DI6 digital inputs, we want to achieve 3 constant speeds: 10,
25 and 50Hz. The Start/Stop signal is given via the digital input DI1 and the
direction change is done via the input DI2.
In order to do so, it is necessary to:
• switch on the control place B: par. 2.01 set to
"7" - On
;
• check if par. 2.05 and 2.08 have factory settings:
◦ par. 2.05 Start B:
"0" -DI
,
◦ par. 2.08 Remote Start:
"0"
.
• Assign digital inputs DI5 and DI6 as constant speed input signals
W1 and W2, respectively:
◦ par. 2.30 (input W1):
"5" -DI5
,
◦ par. 2.31 (input W2):
"6" -DI6
.
• Define 10, 25 and 50 Hz constant speeds:
◦ par. 2.33 (constant speed 1) set to 10 Hz,
◦ par. 2.34 (constant speed no. 2) set to 25 Hz,
◦ par. 2.35 (constant speed no. 3) set to 50 Hz.
Fig. 5.4 shows the arrangement of electrical connections for above-mentioned
example.
•
START/STOP: applying 24Vdc voltage to the DI1 digital input.
•
Changing the direction of rotation: applying 24Vdc voltage to the DI2
digital input.
•
Speed selection: applying 24Vdc voltage to digital inputs DI5 and/or
DI6 according to table 5.6.
(DI1)
10
(DI2)
11
(DI3)
12
(DI4)
13
(DI5)
14
(DI6)
15
(+24V)
16
W1
W2
START/
STOP
Change of
direction
Fig. 5.4. Connection system on terminal block X1 for
three constant speeds
TWERD Power Electronics
37
