Chapter 5 – Start-up Procedure
5-8 ACS 502 Installation & Start-up Manual
Password Protection
(Parameter Lock)
Parameter Lock prevents unauthorized persons from altering the parameters.
When Parameter Lock is active the Setting mode cannot be selected and ACS
502 parameters can not be changed. The ACS 502 Parameter Lock can be
controlled with the Keypad (Operating Data Parameter 20 (Parameter Lock))
or a digital input. Parameter 10.4.3 (Param. Lock Sel) (Keypad, DI1 – DI6)
selects the control location. To activate the Parameter Lock, set operating
Data Parameter 20 (Parameter Lock) to LOCKED xxx if the control location
is the Keypad or activate the selected digital input if the control location is a
DI setting.
The Parameter Lock control location is indicated in Operating Data Parameter
20 (Parameter Lock). Characters xxx after the parameter value (OPEN xxx,
LOCKED xxx) indicate that the current control location is Keypad.
To open the Parameter Lock, you must enter the correct combination. The
combination for all ACS 502 units is 358. When viewing Parameter Lock,
enter setting mode and set the xxx to 358. Press [ * ] to open the Parameter
Lock. Refer to the ACS 500 Adjustable Frequency AC Drives 2 to 350 HP
Programming Manual Including Application Macros, Chapter 3 – Control
Operations, for detailed setting instructions.
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