Operating Functions - Descriptions And Examples - Toshiba TOSVERT-130G2+ Operation Manual

8.7

Operating Functions - Descriptions and Examples

Some features not previously introduced, but just as important, are found in this section
along with all of the other features and functions.
Selects standard setting mode and sets maximum safe frequency (FH) for motor
being run.
FMAX
0
VOLTAGE BOOST - Increases the start-up torque of the motor being run.
AUTO TORQUE BOOST - Automatically increases the percentage of voltage boost
V/F
when starting torque requirements are abnormally high.
1
FREQUENCY at MAXIMUM VOLTAGE - Sets the frequency at which the output voltage
is 100%.
V/f PATTERN - Selects a constant or variable torque pattern.
ACC1, DEC1, Pt1/ACC2, DEC2, Pt2 - Sets the times required to ACC/DEC between
ACC/DEC
0Hz and the maximum frequency value FH. Also selects the pattern by which the
2
ACC/DEC times are run (see section 5.7)
SEL2 - Selects which ACC/DEC/Pt will be used (#1 or #2).
Note: ACC/DEC times are the times required to go between 0Hz and the maximum
frequency FH.
UPPER LIMIT - Sets the upper frequency limit. The inverter will never operate above
UL/LL
this upper limit.
3
Note: The value of FH must always be equal to or greater than the value of UL.
LOWER LIMIT - Sets the lower frequency limit. The inverter will never operate below
this lower limit.
Application Example - The inverter is used to control a 50Hz motor which has a safe
operating frequency of 80Hz. This motor drives a conveyor belt which must run
according to the following specifications:
ACC/DEC times are the times required to go between 0Hz and FH.
1) For this example, a VOLTAGE BOOST OF 10% is needed to move the
conveyor at low start-up speeds: "ub=10"
2) Although a 50Hz motor is used, specifications require 100% output voltage
at 60Hz:
3) Conveyor belt systems require a constant torque: "Pt=0"
4) When running the conveyor the inverter must run no faster than 60Hz and
no slower than 20Hz:
5) The maximum acceleration and deceleration between 20Hz and 60Hz must
be 30 seconds and 10 seconds respectively. A linear pattern is required.
Choosing
Acceleration
FIRST FUNCTIONS
"uL=60"
"LL=20"
FH=80
60
40Hz
20
0
8 - 21
"tyP=1" "FH=80"
"UL=60"
30 Sec.
10 Sec.
TOSHIBA
Time