VSD Locking
EMHEATER VSDs offer 2 forms of locking as follows:
- Parameter Locking: This method is mostly used to prevent users from accidently modifying any of the parameter settings. This can be done by setting A0-07 = 1 (Not Modifiable). All parameters are then read-only, and to modify any of the parameters, first set A0-07 = 0 (Modifiable).
- Inverter Locking: This method is used to prevent users from modifying any of the parameter settings by using a Password as protection. This is done by setting A0-00 equal to a non-zero value (the value/code is the user password). The password takes effect immediately after updating A0-00. When the “PRG” key is pressed, the keypad will display “——”, and the password must be entered to unlock the VSD again. To cancel the password protection function, enter with password and set A0-00 to 0.
* Note that the Inverter Locking method can be used to prevent all use of the VSD after a set runtime. This can be done as follows:
- Check the VSD present running time: See b9-09 value.
- Set the lock running time b2-21 = to the runtime limit + the value as noted for b9-09.
- Set the password using A0-00.
* After reaching the new runtime (b2-21), the VSD will lock itself and the Keypad panel will show Err26. This can then only be resolved using the password to unlock the VSD and changing the runtime limit. To keep the VSD locked without a runtime limit, ensure b2-21 = 0.
