Operational Modes; Run Mode Edits; Control Algorithms; Inverter Torque Control Algorithms - Hitachi L300P Series Instruction Manual

Operational
The RUN and PGM LEDs tell just part of the story;
Run Mode and Program Modes are independent
Modes
modes, not opposite modes. In the state diagram to
the right, Run alternates with Stop, and Program
Mode alternates with Monitor Mode. This is a very
important ability, for it shows that a technician can
approach a running machine and change some
parameters without shutting down the machine.
The occurrence of a fault during operation will
cause the inverter to enter the Trip Mode as shown.
An event such as an output overload will cause the
inverter to exit the Run Mode and turn OFF its
output to the motor. In the Trip Mode, any request
to run the motor is ignored. You must clear the
error by pressing the Stop/Reset switch. See
"Monitoring Trip Events, History, & Conditions"
on page

Run Mode Edits

The inverter can be in Run Mode (inverter output is controlling motor) and still allow you to
edit certain parameters. This is useful in applications that must run continuously, yet need some
inverter parameter adjustment.
The parameter tables in this chapter have a column titled "Run Mode
Edit." An Ex mark ✘ means the parameter cannot be edited; a Check
mark ✔ means the parameter can be edited. You'll notice in the table
example to the right the two adjacent marks: "✘ ✔". The two marks,
(that can also be "✘ ✘" or "✔ ✔") correspond to these levels of access
to editing:
• Low-access level to Run Mode edits (indicated by left-most mark)
• High-access level to Run Mode edits (indicated by right-most mark)
The Software Lock Setting (parameter B031) determines the particular access level that is in
effect during Run Mode and access in other conditions, as well. It is the responsibility of the
user to choose a useful and safe software lock setting for the inverter operating conditions and
personnel. Please refer to page
Control
The motor control program in the L300P
inverter has several sinusoidal PWM
Algorithms
switching algorithms. The intent is that you
select the best algorithm for the motor
characteristics in your application. Each
algorithm generates the frequency output in
a unique way. Once configured, the
algorithm is the basis for other parameter
settings as well (see
Algorithms" on page
choose the best algorithm early in your
application design process.
6–5.
"Software Lock Mode" on page 3–35
"Torque Control
3–14). Therefore,
L300P Inverter
STOP
RESET
Run
FUNC.
Monitor
STOP
RESET
Run
Fault
Trip
for more information.

Inverter Torque Control Algorithms

V/f control,
00
constant torque
V/f control,
01
variable torque
V/f control, free-
02
setting curve
3–5
Stop
RUN
Program
Stop
RUN
STOP
RESET
Fault
Run
Mode
Edit
Lo Hi
✘ ✔
A044
Output