EM/EMS Stabilisers Electronic Servo AC Voltage Stabilisers & Power Conditioners
Output voltage accuracy: +/- 0.5% accuracy maintained over
the full range of input voltage variations from zero to full
load irrespective of power factor, frequency variations and ambient
temperature changes from –15 Deg C to +45 Deg C. Three
phase stabilisers will also maintain the accuracy of each phase,
both line to line and line to neutral, even if the input voltage.
Load and power factor are totally unbalanced.
Fast response
Low internal impedance capable of sustaining high surge currents
Efficiency better than 98% with up to 99.5% on higher models
Waveform distortion negligible with any type of load
Soft-Start ensures low output voltage at the moment of switching
on
Soft-Stop dampens the force of impact when the variable transformer
brush gear reaches the end stop.
Full Transverse and Common Mode spike / interference suppression
when required.
Oil Immersed versions for outdoor use or for use in hostile
environments
Stabilised Output Voltage Can be preset to any value within
these ranges
H Models
200 to 254 V single phase
346 to 440 V three phase
L models
100 to 127 V single phase
173 to 220 V three phase
Power Factor has no effect on the performance
Surge rating ten times the rated current up to 2 seconds. Three
times up to 1 minute. Twice up to 5 minutes
Environment the quoted current ratings apply to ambient temperatures
from –15 DegC to +45 DegC. Derate by 2% per each additional
degree C up to 70 DegC. Temperature stability better than 0.0003%
per degree C. Maximuim altitude 1000m. Derate by
2.5% for each additional 500m, EM stabilisers are suitable for
indoor tropical use.
Spike Suppression. Metal oxide transient voltage suppression
is fitted as standard. Additional protection can be provided
to attenuate spikes and noise down to harmless levels.
Lightning Arrestors. Can be provided to protect the stabiliser
and the load form the harmful effects of induced lightning strikes
to the incoming supply distribution network.
Construction, the larger stabilisers are enclosed in robust
floor standing cubicles, with door access for easy installation
and servicing. The smaller single phase models are
suitable for floor or bench mounting, Enclosures to IP20 BS5490/IEC529
CE Conformity Conforms to the requirements of council directive
89/336/EEC EMC emissions / immunity and 73.23.EEC Low voltage
directive
Speed of response Defined as the time taken to restore a 10%
voltage variation to within 2%, these will vary 0.15 secs on
smaller units to 1 sec for larger models.
Three Phase models are normally supplied for “star” connection
and require an incoming neutral. If no neutral available a static
balancer will be fitted to provide an artificial neutral.
Quality Managment System. Assessed and approved to ISO 9001:2000
