Dimmer Operation 4-4
Revision 2 - 20 March, 1997 HP SERIES DIMMER OPERATING MANUAL
display at any time by pressing ENTER. Press ENTER and turn the encoder
wheel at the same time to display information “vertically”, ie. display the same
information for different channels.
Pressing the NORMAL button on the keypad will change the display to “OK” to
indicate the dimmer is now in normal operating mode.
Normal DMX operation of the dimmer is unaffected by selecting this function.
4.1.4.8 “V.COM” Output voltage Compensation
E Figure 4.1B
An HP dimmer can be setup so that it will compensate for variations in the mains
input voltage. Selecting “V.COM” allows the internal voltage compensation to
be turned on or off, or calibrated.
• Selecting “V.COM” gives the options of “ON”, “OFF”, “LINE” and
“MAX”. Use the FUNCTION encoder wheel to choose the desired option
and press ENTER to confirm selection. Selecting “LINE” allows calibration
for the voltage compensation, while selecting “MAX” allows setting of the
maximum output voltage the dimmer regulates to.
When “ON” or “OFF” has been selected:
The display will change to “OK” to indicate the dimmer is now in normal operating
mode with the selected change implemented.
When “LINE” has been selected:
• Note that an external voltmeter is necessary to complete this procedure.
This parameter should not need to be adjusted during normal operation.
Adjust the displayed voltage using the FUNCTION encoder wheel until it
reads the same as the current input voltage, as displayed on the voltmeter. It is
recommended that all phases be driven from a single phase source eg. via a
single to three phase adaptor, to eliminate phase voltage variations.
• Press ENTER to calibrate the dimmer.
• The display will change to “OK” to indicate the dimmer is now in normal
operating mode with the selected change implemented.
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
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