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L100 Inverter
Powerup Test Observations and SummaryStep 10: Reading this section will help you make some useful observations when first
10running the motor.
Error Codes - If the inverter displays an error code (format is “E x x”), see “Monitoring Trip Events, History, & Conditions” on page
Acceleration and Deceleration - The L100 inverter has programmable acceleration and deceleration values. The test procedure left these at the default value, 10 seconds. You can observe this by setting the potentiometer at about half speed before running the motor. Then press RUN, and the motor will take 5 seconds to reach a steady speed. Press the STOP key to see a 5 second deceleration to a stop.
State of Inverter at Stop - If you adjust the motor’s speed to zero, the motor will slow to a near stop, and the inverter turns the outputs OFF. The
Interpreting the Display - First, refer to the output frequency display readout. The maximum frequency setting (parameter A_04) defaults to 50 Hz or 60 Hz (Europe and United States, respectively) for your application.
Example: Suppose a
Speed in RPM = | = | = | = 1800RPM | |||
| Pairs of poles |
| # of poles |
| 4 |
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Installation and | Mounting Inverter |
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The theoretical speed for the motor is 1800 RPM (speed of torque vector rotation). However, the motor cannot generate torque unless its shaft turns at a slightly different speed. This difference is called slip. So it’s common to see a rated speed of approximately 1750 RPM on a 60 Hz,
Run/Stop Versus Monitor/Program Modes – The Run LED on the inverter is ON in Run Mode, and OFF in Stop Mode. The Program LED is ON when the inverter is in Program Mode, and OFF for Monitor Mode. All four mode combinations are possible. The diagram to the right depicts the modes and the mode transitions via keypad.
Run
Monitor
STOP
RESET
RUN
FUNC.
Stop
Program
NOTE: Some factory automation devices such as PLCs have alternate Run/Program modes; the device is in either one mode or the other. In the Hitachi inverter, however, Run Mode alternates with Stop Mode, and Program Mode alternates with Monitor Mode. This arrangement lets you program some values while the inverter is operating— providing flexibility for maintenance personnel.