Econoflame R2700/R2800/R2900 boilers - CMS

Earth leakage trips can give problems when they are used in
combination with frequency converters. In some countries this
is actually forbidden. There are two reasons for this:
a All rectifiers (not only frequency converters) can cause direct
currents to flow in the mains power supply and which can
reduce the sensitivity of the safety switch
b The asymmetric loading caused by radio interference filters
can result in the premature operation of the earth leakage
trip, which in turn will result in the unit being switched off.
In order to prevent malfunctions occurring as a result of
inductive or high frequency signals, or static electricity,
screened cables must be employed for all low voltage and
control signals between the boiler and externally connected
units. The screening must be earthed at both ends
of the cable.
2789CV02C 21