4 Operation
4.3 Commissioning (default setting)
DB1 variable frequency drive
11/20 MN040031EN
Eaton.com
86
The start enable is done by actuating one of the digital inputs with +24 V:
•
Terminal 1: FWD = Clockwise rotating field (Forward Run)
•
Terminal 2: REV = Counterclockwise rotating field (Reverse Run)
▶
You can now set the output frequency (0 - 50 Hz) and, as a result, the
speed of the connected three-phase motor (0 - n
Motor
), by using the
potentiometer via terminal 6 (0 - +10 V proportional voltage signal).
The output frequency will then be changed after a delay according to the
specified acceleration and deceleration times. In the default settings,
these times are set to 5 seconds each.
The acceleration and deceleration ramps specify the time change for the
output frequency: from 0 to f
max
(WE = 50 Hz) or from f
max
back to 0.
Figure 50 shows an example of the timing when an enable signal RUN is
turned on (FWD or REV), and the maximum set point voltage (+10 V) is
applied to control terminal 6. The speed of the motor follows the output fre-
quency, depending on the load torque and moment of inertia (slip), from zero
to n
max
. The acceleration time is set in parameter P-03.
If the enable signal (FWD or REV) is switched off during operation, the inver-
ter will be disabled immediately (STOP) and the output frequency will be set
to zero. This will cause the motor to coast to a stop – see
①
below.
If both enable signals (FWD and REV) are applied, the variable frequency
drive will perform a quick stop using the time set in parameter P-24.
Figure 50: Start-stop command at maximum set point voltage,
acceleration ramp 5 s
t
t
f
max
~ n
max
f
P-03 = 5 s
FWD
REV
+24 V
= 50 Hz
0
P-07
①
RUN
STOP