Operational Modes - Hitachi SJ100 Instruction Manual

Operational Modes

The RUN and PGM LEDs tell just part of the story;
Run Mode and Program Modes are independent
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 6–5.
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.
The Software Lock Setting (parameter B_31) determines when
the Run Mode access permission is in effect and access
permission 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
"Software Lock Mode" on page 3–28
Control Algorithms
The motor control program in the SJ100
inverter has three sinusoidal PWM switch-
ing algorithms. The intent is that you select
the best algorithm for the motor characteris-
tics 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 "Torque Control Algorithms" on
page 3–13). Therefore, choose the best
algorithm early in your application design
process.
Run
Monitor
Run
Fault
for more information.
Inverter Control Algorithms
Variable freq. control,
constant torque
Variable freq. control,
reduced torque
Sensorless vector
control
SJ100 Inverter
STOP
RESET
Stop
RUN
FUNC.
Program
STOP
RESET
Stop
RUN
STOP
RESET
Trip Fault
Run
Mode
Edit
✘
✔
Output
3–5