Dimmer Operation 4-4
Revision 2 - 26 April, 2000 HP SERIES DIMMER TECHNICAL MANUAL
4.1.4.5 “P. FLT” - Mains Power Fault
(
Figure 4.1A
The HP series dimmers will detect two types of mains supply problems:
•
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 HP dimmers will tolerate and even correct for mains supply problems of
sufficient magnitude to damage less tolerant equipment connected to the same
supply. The HP dimmer 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.
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