Toshiba Adjustable Speed Drive H3 - Manual (Page 72)

TOSHIBA
9 - 3
Parameter Explanations
GROUP: FUNDAMENTAL PARAMETERS #1
and
GROUP: FUNDAMENTAL PARAMETERS #2
allow the
user to store unique V/Hz, accel/decel, etc. parameters for two motors to be operated on one drive at
different times.
Item 1,
MAXIMUM OUTPUT FREQUENCY -
This parameter cannot be changed while the motor is running,
and affects accel/decel times, binary frequency references, and many other parameters and functions. To
limit the drive's ouput frequency range, adjust
UPPER LIMIT FREQUENCY
and/or
LOWER LIMIT
FREQUENCY
(see Items 6 and 7 below).
Item 2,
BASE FREQUENCY #1 - This parameter sets the frequency at which the drive's output voltage
reaches its maximum.
Item 3, BASE FREQUENCY VOLTAGE SELECTION -
The parameter affects the drive's maximum output
voltage as follows:
0: The output voltage fluctuates with the input voltage.
1: The output voltage is set according to the input voltage when the drive is first powered.
2: The output voltage is set by Item 4,
MAXIMUM OUTPUT VOLTAGE #1.
Item 4, MAXIMUM OUTPUT VOLTAGE #1 - This parameter sets the drive's maximum output voltage. The
output voltage cannot exceed the input voltage.
Item 5, REVERSE DISABLE OPERATION SELECTION - The drive will not run in reverse with this
parameter set to '1'.
Item 6, UPPER LIMIT FREQUENCY - This parameter sets the maximum frequency the drive will output,
regardless of reference.
Item 7,
LOWER LIMIT FREQUENCY -
This parameter sets the lowest speed the drive can run, regard-
less of reference. If this parameter is set to a non-zero value and the drive is given a run command (i.e.
F-CC closure or RUN button), the drive will run at
LOWER LIMIT FREQUENCY
if the reference is less
than
LOWER LIMIT FREQUENCY
.
Item 8,
VOLTS PER HERTZ PATTERN
- This parameter cannot be changed while the motor is running.
The value here sets the way the output voltage changes with output frequency:
1: Constant torque: Drive varies its output voltage linearly with its output hertz change (at 30 Hz,
output voltage is approximately half of what it is at 60 Hz).
2: Variable torque: Drive varies its output voltage as the square of its output hertz change (at 30
Hz, ouput voltage is approximately 1/4 of what it is was at 60 Hz).
3: Automatic torque boost: Drive increases its output voltage at low output Hz to increase motor
starting torque.
4: Automatic torque boost with energy saving feature: Same as number 3 above, but drive lowers
output voltage during lightly-loaded periods (reduces idle amps).
5: True torque control: Drive maximizes torque developed by motor and compensates for
motor slip. Item 298,
BLIND FUNCTION SELECTION
and Item 315,
MOTOR PARAMETERS
BLIND
, must also be set to "1" so that
GROUP:MOTOR PARAMETERS
can be adjusted (see
page 8-31).
6: True torque control with energy saving feature: Same as number 5 above, but drive lowers
output voltage during lightly-loaded periods (reduces idle amps).