Mitsubishi Electric FR-D720S SC EC Instruction Manual page 320

Misoperation prevention and parameter setting restriction
Password lock/unlock (Pr. 296, Pr. 297)
● Lock
Set parameter reading/writing restriction level (Pr. 296 ≠ 9999).
During Pr. 296 = "101 to 106", if password unlock error has occurred 5 times, correct
password will not unlock the restriction. Parameter all clear can unlock the restriction. (In
this case, parameter settings are cleared.)
Write four-digit numbers (1000 to 9998) in Pr. 297 as a password.
(When Pr. 296 = "9999", Pr. 297 can't be written.)
When password is registered, parameter reading/writing is restricted with the restriction set
level in Pr. 296 until unlocking.
NOTES After registering a password, a read value of Pr. 297 is always "0" to "5".
When a password restricted parameter is read/written, "LOCD" is displayed.
Even if a password is registered, parameters which the inverter itself writes, such as inverter
parts life, are overwritten occasionally.
Even if a password is registered, Pr. 991 "PU contrast adjustment" can be read/written when
a parameter unit (FR-PU04/FR-PU07) is connected.
● Unklock
There are two ways of unlocking the password:
– Enter a password in Pr. 297.
Unlocked when a password is correct. If a password is incorrect, an error occurs.
During Pr. 296 = "101 to 106", if password unlock error has occurred 5 times, correct
password will not unlock the restriction. (During password lock)
– Perform parameter all clear.
Password lock is unlocked. However, other parameter settings are cleared also.
NOTES
If the password has been forgotten, perform parameter all clear to unlock the parameter
restriction. In that case, other parameters are also cleared.
Parameter all clear can not be performed during operation.
Do not use the FR Configurator under the conditions that parameter read is restricted
(Pr. 296 = "4, 5, 104, 105"). FR Configurator may not function properly.
6 - 170
Pr. 296
1 to 6
101 to 106
Restriction of Password
Unlock Error
No restriction
Restricted at fifth error
Parameter
Pr. 297 Display
Always „0"
Displays error count
(0 to 5)