17-08-2012, 02:47 PM
PEF-301
[attachment=31847]
APPLICATIONS
The PEF-301 universal automatic electronic phase switch is designed to supply an industrial/ appliance
single-phase 220V/50Hz load from three-phase four-wire mains 3x380+N in order to maintain uninterrupted
power supply of essential single-phase loads and protect them against unallowable voltage variations in the
mains. To this end a single phase load is connected into the three-phase mains with the interposition of the
PEF-301. According to voltage presence and voltage quality on phases the PEF-301 will automatically select the
optimum phase and switch the single phase load supply to this phase.
OPERATION
The PEF -301 is a digital microprocessor - based device. User sets trip thresholds of the PEF-301, i. e. the
minimum and the maximum voltage thresholds on reaching of which the device trips and de-energizes a load
(switches the load to a reserve phase). The PEF-301 is connected to the three-phase four-wire mains through
the 1(L1), 3(L2), 5(L3), 6(N) input terminals.
The phase L1 is the priority one, i. e. the load will always be energized from the L1 phase if voltage on this
phase is present & within user-preset thresholds. The device performs monitoring of voltage presence & values
on each phase and if the voltage value on the L1 goes outside the trip threshold range the PEF-301 effects the
high speed (a switch delay is not more than 0.2 s) switching of the load to the phase where voltage value is
within trip thresholds. If the voltages on both reserve phases are outside the preset trip voltage thresholds the
load will be de-energized.
NOTES AND RECOMENDATIONS:
to bring-in the phase priority when the PEF-301 backs up the load of considerable value. In this case after
the load had been switched to reserve phases and the voltage on the priority phase regenerated the load will
return to the priority phase and thus sustained overload of the reserve phase will be excluded;
not to bring-in (to exclude) the phase priority if the PEF-301 backs up the essential load of inconsiderable
value because the switching of this load to reserve phase will not virtually produce an effect on phase loading;
to select different priority phases for different single-phase loads in order to avoid phase overloads when
several devices are energized from the one and the same mains.
Internal blocking for sticking of output built-in relay contacts is provided in the PEF-301. Also the PEF-301
performs the monitoring of the magnetic starter power contact position in external circuit and is blocking the
power contacts for their sticking (the 12 terminal is used, see WIRING DIAGRAM №2)
[attachment=31847]
APPLICATIONS
The PEF-301 universal automatic electronic phase switch is designed to supply an industrial/ appliance
single-phase 220V/50Hz load from three-phase four-wire mains 3x380+N in order to maintain uninterrupted
power supply of essential single-phase loads and protect them against unallowable voltage variations in the
mains. To this end a single phase load is connected into the three-phase mains with the interposition of the
PEF-301. According to voltage presence and voltage quality on phases the PEF-301 will automatically select the
optimum phase and switch the single phase load supply to this phase.
OPERATION
The PEF -301 is a digital microprocessor - based device. User sets trip thresholds of the PEF-301, i. e. the
minimum and the maximum voltage thresholds on reaching of which the device trips and de-energizes a load
(switches the load to a reserve phase). The PEF-301 is connected to the three-phase four-wire mains through
the 1(L1), 3(L2), 5(L3), 6(N) input terminals.
The phase L1 is the priority one, i. e. the load will always be energized from the L1 phase if voltage on this
phase is present & within user-preset thresholds. The device performs monitoring of voltage presence & values
on each phase and if the voltage value on the L1 goes outside the trip threshold range the PEF-301 effects the
high speed (a switch delay is not more than 0.2 s) switching of the load to the phase where voltage value is
within trip thresholds. If the voltages on both reserve phases are outside the preset trip voltage thresholds the
load will be de-energized.
NOTES AND RECOMENDATIONS:
to bring-in the phase priority when the PEF-301 backs up the load of considerable value. In this case after
the load had been switched to reserve phases and the voltage on the priority phase regenerated the load will
return to the priority phase and thus sustained overload of the reserve phase will be excluded;
not to bring-in (to exclude) the phase priority if the PEF-301 backs up the essential load of inconsiderable
value because the switching of this load to reserve phase will not virtually produce an effect on phase loading;
to select different priority phases for different single-phase loads in order to avoid phase overloads when
several devices are energized from the one and the same mains.
Internal blocking for sticking of output built-in relay contacts is provided in the PEF-301. Also the PEF-301
performs the monitoring of the magnetic starter power contact position in external circuit and is blocking the
power contacts for their sticking (the 12 terminal is used, see WIRING DIAGRAM №2)