Jands HP12 Technical Manual - page 38
Dimmer Operation
4-7
Revision 2 - 26 April, 2000
HP SERIES DIMMER
TECHNICAL MANUAL
When “MAX” has been selected:
•
Adjust the displayed voltage using the FUNCTION encoder wheel until it is
equal to the desired maximum output voltage from the dimmer when driven to
full. eg to avoid running 220 volt lamps above their rated voltage set this
parameter to 220V.
•
Press ENTER to set the maximum output voltage from the dimmer.
•
The display will change to “OK” to indicate the dimmer is now in normal
operating mode with the selected change implemented
Note that the voltage compensation system works within the following limitations:
1.
The output cannot be driven above the input voltage. eg if the MAX value is
set to 240, and the mains input voltage is 220, the maximum voltage available
at the output is 220 volts.
2.
The compensation system does not operate on switched outputs (ie. channels
with dimmer law set to “switch”).
3.
The dimmer must be correctly calibrated as outlined above.
Normal DMX operation of the dimmer is unaffected by this procedure, however the
dimmed output level may change due to normal operation of the compensation
system.
4.1.4.9 “LOCK” Parameter Lockout Facility
(
Figure 4.1B
If the dimmer is to be left unattended it is sometimes desirable to be able to lock the
settings such that unauthorised users cannot alter them. The “LOCK” option
provides this facility.
•
Selecting “LOCK” gives the single option of “ON”. Pressing ENTER locks
the dimmer, and “LOCK” is displayed.
•
To unlock a dimmer, turn the FUNCTION encoder wheel one step to the left,
press enter, one step to the right, press enter, and finally one step to the right. If
a mistake is made during the unlock procedure, turn the wheel more than three
steps to the right to reset the sequence and try again.
•
When the dimmer has been unlocked it will display “OK”.
Normal DMX operation of the dimmer is unaffected by selecting this function.