61
Using the Keypad Devices Section 3-2
3-2-2 Operational Modes
The RUN and PRG 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 shut-
ting down the machine.
The occurrence of a fault during opera-
tion will cause the inverter to enter 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 6-2 Monitoring Trip Events, History, & Conditions
on page 238.
3-2-3 Run Mode Edit
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, you need some inverter parameter adjustment.
The parameter tables in this chapter have a column
titled "Run Mode Edit". An Ex mark 8 means the param-
eter cannot be edited; a Check mark 9 means the
parameter can be edited. The Software Lock Setting
(parameter
B031) 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 3-6-5 Soft-
ware Lock Mode on page 106 for more information.
3-2-4 Control Algorithms
The motor control program in the
MX2 inverter has two sinusoidal
PWM switching algorithms. The
intent is that you select the best
algorithm for the motor and load
characteristics of your application.
Both algorithms generate the fre-
quency output in a unique way. Once
configured, the algorithm is the basis
for other parameter settings as well
(see 3-5-4 Torque Control Algo-
rithms on page 79). Therefore, choose the best algorithm early in your appli-
cation design process.
Run Stop
Monitor Program
Run Stop
Trip
Fault
Fault
Run
Mode
Edit
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