Hitachi SJ200 Reference

Hitachi America, Ltd.

ENGINEERING NOTE

SUBJECT: ANALOG VOLTAGE INPUT CALIBRATION ERROR

EN-050202-1

AFFECTED MODELS:

Certain models of L200 and SJ200 were inadvertently shipped with the 0 – 10 Volt Analog Input (terminal O – L) span parameter improperly calibrated.

The symptom is easily determined. The inverter will operate properly with a frequency reference from keypad potentiometer, analog 4 – 20 mA input or F001 setting. However when the frequency reference is set to the O voltage input, the inverter will act erratically at 0 V input, and may trip on overcurrent. The output frequency will ramp up linearly from 0 V to approximately 0.2 V input with a corresponding output frequency of 0 to the maximum (factory default is 60 Hz) frequency. From input voltages from 0.2 V to 10.0 V, the inverter output will remain pegged at the maximum frequency.

To correct this problem, first stop the inverter. Then follow these steps:

1. Press FUNC to enter the PROGRAM mode.

2. Using the UP / DN arrow keys, navigate to parameter

3. Press FUNC to view the contents, and press UP arrow key to change the

L200 and SJ200 – MFG DATE 0501 & BEFORE

C091.

value to

4. Press STR to save the change. This will make the so-called “debug” parameters accessible.

5. Using UP arrow key, navigate to parameter

6. Press FUNC to view contents. It most likely is

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C121

6553

7. Using the DN arrow key, change the value to 1100. (Note the decimal point after the number - this is critical!!) As you decrement the parameter

value, you will scroll past going down toward zero, and the sequence will start again at 9999.

(WITH decimal point after!) and continue decrementing from there.

8. Continue down until the display reaches value. The display should show

9. Navigate with the DN arrow key to C091 and press FUNC again.

10. Change setting from 01 back to 00 with DN arrow key. Press STR again to save. Display again should read

11. Press FUNC TWICE until display reads

12. Press UP arrow key until you reach

13. Press FUNC, then STR This step re-establishes the output frequency display as the power-on default display.

The analog voltage input should now operate linearly with a 0 – 10 V input corresponding to a 0 – 60 Hz output.

1100 (WITHOUT a decimal point!!) Continue

1100. Press STR to save the

C121 again.

C091

C---

o 001

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