Dimmer Operation 4-3
Revision 2 - 20 March, 1997 HP SERIES DIMMER OPERATING MANUAL
4.1.4.5 “P. FLT” - Mains Power Fault
E Figure 4.1A
The HP12-TR / HP12-SC dimmers will detect three types of mains supply
problems:
• Mains overvoltages
• Mains undervoltages
• Neutral-to-earth overvoltage
In some venues the three phase power supply may be less than ideal, and one or
more of the above fault conditions may occur without the wiring being truly
“faulty”. For this reason it is possible (BUT NOT RECOMMENDED) to use the
P.FLT option to turn off the power fault detect ("the show must go on").
ALWAYS check first that the problem is not a dropped neutral in either of the
three phase connectors, or a missing earth connection.
WARNING
IF THE NEUTRAL DETECT FACILITY IS DISABLED, IT IS POSSIBLE
THAT UNSAFE MAINS SUPPLY WIRING MAY NOT BE DETECTED.
The HP12-TR / HP12-SC dimmers will tolerate and even correct for mains
supply problems of sufficient magnitude to damage less tolerant equipment
connected to the same supply. The HP12-TR / HP12-SC detection facilities may
be used to provide "early warning" protection for ancillary equipment. Section
5.1.3 gives a more in-depth explanation of this facility.
• Selecting “P.FLT” gives the options of “ON” or “OFF”. Use the
FUNCTION encoder wheel to choose the option and press ENTER to
confirm selection.
• The display will change to “OK” to indicate the dimmer is now in normal
operating mode with the selected change implemented.
Normal DMX operation of the dimmer is unaffected by selecting this function.
4.1.4.6 “TERM” DMX Signal Terminate
E Figure 4.1B
Selecting “TERM” allows the DMX signal to be correctly terminated, as is
required for the last dimmer in a DMX line. Note that when set to “ON” the
DMX Loop connector in unused.
Pressing the NORMAL button on the keypad will change the display to “OK” to
indicate the dimmer is now in normal operating mode.
4.1.4.7 “CHEK” dimmer operating parameter display
E Figure 4.1B
Selecting “CHEK” displays the dimmer’s operating parameters on a channel by
channel basis. This is useful for checking that a dimmer has been setup correctly.
Select the channel to be checked by turning the FUNCTION encoder wheel (the
STATUS LED of the channel being checked will flash). Stop the scrolling of the
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