Perform A Test Run With A Machine Load - Hitachi WJ Series User Manual

Chapter 8
8.2.2

Perform a Test Run with a Machine Load

 How to perform a test run by connecting the motor and the load machine to the inverter?
Q
 If there is no problem in operation with no load, perform a test run with an actual load
A
connected to the mechanical system to check for any problems.
Note
Burnout
Damage
DO
■ Test run with actual load connected to load machine
▼
(1) After confirming that the motor is completely stopped, connect the mechanical system and
check that there are no loose mounting screws, etc. If an inverter is connected, wait at least
10 minutes after the power is shut off, and then use a tester or similar device to check that
there is no residual voltage between [P/+] and [N/-] terminals on the main circuit terminal
block, and then perform the work after confirming safety.
(2) When using automatic torque boost or sensorless control, be sure to set the motor constant
of the motor to be used. For details, refer to "8.1.5 Setting Motor Constant" or "8.3 Carrying
out Motor Auto-tuning". If auto-tuning is not possible when the load machine is connected,
perform auto-tuning with no load connected only to the motor in advance, calculate the
moment of inertia of the load in terms of motor axis conversion, and add it to "motor constant
J".
(3) After selecting the frequency command, RUN command input source selection, and other
required settings, turn on RUN command to start operation. It is recommended that the
frequency reference is set to a low speed of approximately 10 Hz for safety at the first time.
(4) Check the following items to see if there is any problem with the operation status.
■ Confirmation during test run at actual load
!
 Confirm that the operation direction of the machine is correct, that the machine operates
smoothly.
 If possible, confirm that there is no abnormal noise or vibration even if the frequency command
or operation direction is changed.
 Confirm that there is no trip during acceleration/deceleration and that the rotation speed and
frequency meter are correct.
 Confirm that "Overcurrent error [E01] to [E04]," " Overload error [E05]," and "Overvoltage error
[E07]" do not occur during test run.
 Check "Output current monitor [d002]," "DC bus voltage monitor [d102]," and "Electronic
thermal load ratio monitor (motor) [d104]" to make sure that the current, voltage, and load ratio
values have enough margin to trip.
 If the operation during V/f control is not stable, refer to "9.5.6 Stabilizing Motor Hunting" for
adjustment.
 If sufficient characteristics cannot be obtained, such as when a shock occurs at start-up and the
motor is disturbed during operation with automatic torque boost or sensorless vector control,
refer to "9.5.3 Using Torque Boost Function" and "9.5.7 Driving with Sensorless Vector Control"
for adjustment.
 See "Chapter 15 Tips/FAQ/Troubleshooting" for more information about tripping and
troubleshooting additional issues.
Mandatory Setting for Motor Drive and Test Run
 Be sure to thoroughly read "Chapter 1 Safety Instructions/Risks" before starting
operation.
 Before conducting a test run with a machine load connected, be sure to
perform a test run and check operation with the motor only according to "8.2.1
Test Run by Connecting Only the Motor".
 Be sure to set basic motor settings such as motor capacity and electronic
thermal level according to the motor to be used. Operation with incorrect
setting may cause damage to the load machine or motor burnout.
 STOP/RESET key on the keypad can be set enable/disable. Prepare an
emergency stop/emergency shut-off switch separately in case of emergency.
8-2-5