HP Series Operating Manual - Jands

Dimmer Operation 4-4display at any time by pressing ENTER. Press ENTER and turn the encoderwheel at the same time to display information “vertically”, ie. display the sameinformation for different channels.Pressing the NORMAL button on the keypad will change the display to “OK” toindicate 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 CompensationE Figure 4.1BAn HP dimmer can be setup so that it will compensate for variations in the mainsinput voltage. Selecting “V.COM” allows the internal voltage compensation tobe 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 optionand press ENTER to confirm selection. Selecting “LINE” allows calibrationfor the voltage compensation, while selecting “MAX” allows setting of themaximum 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 operatingmode 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 itreads the same as the current input voltage, as displayed on the voltmeter. It isrecommended that all phases be driven from a single phase source eg. via asingle 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 normaloperating mode with the selected change implemented.When “MAX” has been selected:• Adjust the displayed voltage using the FUNCTION encoder wheel until it isequal to the desired maximum output voltage from the dimmer when driven tofull. eg to avoid running 220 volt lamps above their rated voltage set thisparameter 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 normaloperating mode with the selected change implementedNote that the voltage compensation system works within the followinglimitations:1 The output cannot be driven above the input voltage. eg if the MAX value isset to 240, and the mains input voltage is 220, the maximum voltage availableat the output is 220 volts.2 The compensation system does not operate on switched outputs (ie. channelsRevision 2 - 20 March, 1997 HP SERIES DIMMER OPERATING MANUAL