Delta DT3 - Manual (Page 15)

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Restore Factory Settings
Lock all buttons by adjusting parameter to in 【Operation Mode】. At the same time press and keys for 3
seconds to display , and enter Password-1357. The screen displays (Parameter reset), selecting will
overwrite all user settings with factory settings.
Key Lock Function
Adjusting parameter to in 【Operation Mode】will lock all keys; adjusting the parameter to allows adjustment
of SV setting values and F1/F2 function keys.
¾
Unlock the key:
Press and keys at the same time in LOCK mode to display parameter, enter the password to unlock the key. Default
password is 0000.
¾
For altering key-lock password:
1. Press key in
screen to enter change-password screen .
2. Enter the current password in screen. If the password is correct, you will be prompted to Set-New-Password