Chapter 4 – Control Operation
4-10 ACH 500 Programming Manual
External Reference
1 and 2
External Reference 1
This is the external frequency reference from control location R1 which is
used for HAND. The signal source selection is made with Parameter 10.2.2
(External Ref 1 Sel). The factory default is Analog Input 2 (AI2). This is used
for the cover-mounted speed pot.
External Reference 2
External Reference 2 goes through an application block, where it can be
manipulated as Keypad Reference 2. The signal source selection is made with
Parameter 10.2.5 (External Ref 2 Sel). The default is Analog Input 1 (AI1).
This is used for the AUTO speed reference.
Password Protection
(Parameter Lock)
Parameter Lock prevents unauthorized persons from altering the parameters.
If Parameter Lock is active through Operating Data Parameter 23 (Parameter
Lock) or Parameter 10.4.3 (Param. Lock Sel) (Keypad, DI1 – DI6), it is not
possible to select the Setting mode to change any ACH 500 parameters, but all
parameters may be accessed and viewed.
The ACH 500 Parameter Lock can be controlled with Keypad (Operating
Data Parameter 23 (Parameter Lock)) or a digital input. The control location
is selected with Parameter 10.4.3 (Param. Lock Sel) (Keypad, DI1 – DI6). To
activate the Parameter Lock, set Operating Data Parameter 23 (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
23 (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 ACH 500 units is 358. When viewing Parameter Lock,
enter setting mode and set the 358 code. Press [ * ] to open the Parameter
Lock.
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