Wayne Kerr AP10030, Руководство пользователя и обслуживания

Страница: 21 / 70

Wayne Kerr AP 1kW Power Supplies • Issue 2 21
the supply will automatically change to constant voltage operation. The ‘CV’ legend will
become illuminated and the ‘CI’ legend will be extinguished.
The voltage setting should be such that under normal load unwanted CI/CV crossovers
do not occur.
If the product of the output current and output voltage reaches the power limit
(approximately 1kW) before the pre-set voltage limit is reached, then the maximum
voltage available will be limited by the power limit circuit.
Constant Power (UNREG)
The ‘UNREG’ legend will illuminate if the load power requirements needed to reach the
voltage or current limit settings exceed the maximum power boundary of 1kW. In the
constant power condition neither the CV nor the CI legend will be illuminated. The
specification may not be valid in this over-range condition but no damage will occur to
the unit. The supply can work continuously in this mode without damage, but it will not
meet specifications. In particular, the output ripple increases substantially and the output
has poor regulation (hence the legend ‘UNREG’).
The bargraph below the ammeter has a secondary scale marked ‘volts available’. The
secondary scale of the bargraph below the voltmeter is marked ‘current available’. These
secondary scales give an indication of the voltage that can be attained at a particular
current setting and the current that can be drawn at a particular voltage setting (before
reaching 1kW output) respectively. For example, at a 20V setting, the ‘current available’
scale shows 50A (Power 1kW = 20V x 50A) and similarly for the ‘volts available’
bargraph.
N.B. Under certain line and load conditions it may be possible to obtain more than 1kW
output power and still be in regulation. However, any change in line or load could result
in the unit going out of regulation. For this reason it is not advisable to use the unit
beyond the 1kW power boundary for normal operation.