User`s guide

75
CHAPTER 5 - START-UP
5.3
START-UP
This section describes start-up procedures when operating
via the keypad (HMI). Two types of control will be considered:
V/F and Vector Control:
The V/F control is recommended in the following cases:
Several motors driven by the same inverter.
Rated current of the motoris lowerthan1/3of rated inverter
current.
For test purposes, inverter is start-up without load.
The V/F control can also be used in applications that do not
require fast dynamic responses, accurate speed regulations
or high starting torque (speed error will be a function of the
motor slip); when you program parameter P138 - Slip
Compensation - you can obtain a speed accuracy of 1 %.
For the most applications, we recommend the vector
control
mode, that permits a higher speed control accuracy (typical
0
.
5 %),
higher starting
torque
and a faster dynamic response.
The necessary adjustments for the operation of the vector
controlareperformedautomatically.Inthiscase the motorshall
be connected to the CFW-08.
This means that the inverter is ready (rdy = ready) to be
operated.
- Inverter with dummy panel (TCL-CFW08 or TCR-
CFW08).
The LEDs ON (green) and ERROR (red) are ON.
Inverter runs some self-diagnosis routines. If no problems are
found the LED ERROR (red) turns OFF. This means that the
inverter is now ready to be operated.
The four LEDsofthe keypad remains ONduringthisprocedure.
Inverter runs some self-diagnosis routines. If no problems are
found, the displayshows:
DANGER!
Even after theAC power supplyhas been disconnected, high
voltages may be still present.
Wait at least
10 minut
e
s
after
powering down to allow full discharge of the capacitors.