Panasonic minas a series - Parameter values change to the former value.; Troubleshooting; In PANATERM, a message communication port or driver cannot be detected appears.

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Troubleshooting
Parameter values change to the former value.
Category
Parameter
Causes
Parameter values are not downloaded
into EEPROM before power off.
Countermeasures
See "Parameter Setting" chapter (page 52).
Category
Wiring
Causes
The communication cable (RS232C)
is connected to CN NET.
Countermeasures
The communication cable (RS232C) must be connected to
CN SER.
In PANATERM, a message "communication port or driver cannot be detected"
appears.
Category
Parameter
Adjustment
Causes
The velocity command input gain is
not correct.
The position loop gain is too small.
The scale is not appropriate.
Countermeasures
Check that the value of Pr50 (velocity command input gain)
is 500 (i.e. 3000rpm/6V).
Adjust the value of Pr10 (position loop gain) to approximately
100.
Correct the values of Pr46 (numerator of 1st command pulse
ratio), Pr4A (Multiplier of numerator of command pulse radio)
and Pr4B (denominator of pulse command scale). See "Details
of Parameters" chapter.
The motor speed does not increase up to the specified value.
The speed (movement) is too large or small.