6.0 DNA Line Filter peration Notes
6.1 verall peration
The DNA Line Filter has a massive inductor at the core of its design. As with all inductors and
transformers there is some humming and buzzing associated with this device.
Humming and buzzing from an inductor is caused by stray magnetic fields emanating from the
inductor causing the enclosure and accessories to vibrate. In addition Magnetostriction is a second
source of vibration (and thereby humming and buzzing) where the iron core of the inductor
changes shape minutely when exposed to magnetic fields.
The humming and buzzing will depend upon the load current placed on this device. If the
humming/buzzing seems loud then it is likely that there are loads within the facility (residential
commercial industrial) that are drawing current in a pulsed fashion.
An example is a portable electric heater that has a pulse-width-modulation controller to set the
amount of heat being produced.
While most heaters have a simple on-off thermostat to regulate the heat a few heaters have a pulse-
width-modulation scheme and will be turning the power off-on-off-on at the power line frequency
(50/60 Hz). These pulses of current will often be considerable (10 to 12 amperes) and this will
result in loud humming/buzzing in the inductor.
While this humming/buzzing will not affect the filtering performance of the DNA Line Filter the
sound may be objectionable.
In the cases where humming or buzzing does occur and if the user finds humming or buzzing
objectionable the DNA Line Filter can be mounted outdoors in a weatherproof enclosure on a
pedestal i.e. not mounted on the building that is occupied. The weatherproof enclosure and pedestal
can be provided by the installing electrical contractor.
It is important to note that the idea of installing the DNA Line filter is to reduce DE in the
facility. A heater that pulses on-off-on-off at the power line frequency, will be generating DE
within the facility and it will be very powerful DE, that likely will extend up to the hundreds
of kilohertz in range. Since this DE is down-stream of the DNA Line Filter, there will be no
attenuation of this internally-generated DE, by the DNA Line Filter. Users who want low DE
in their facility, would be well advised to not use such potent "DE generators" (the pulsed
heater).
6.2 Internal Circuit Breaker and Panel Lamp
The DNA Line Filter has an internal circuit breaker that interrupts the current flow to the DNA
dissipative electronics if the Dirty Electricity current is too high into those electronics. It is
unlikely that this could ever happen because of the high impedance that the DNA Line filter
inductor presents to the DE. Nevertheless it is a prudent part of a safe design.
The DNA Line Filter front panel lamp is connected on the load side of the aforementioned circuit
breaker. If the circuit breaker is on then the unit is functioning normally and the panel lamp will be
on. If the circuit breaker has cycled off then the panel lamp will be off.
In the case where the lamp is seen to be off then reset the breaker and see if the panel lamp stays
on. If for any reason the circuit breaker continues to cycle off please contact the factory for
troubleshooting information.
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