User manual

5
1.1 INTRODUCTION
The 1657 is an AC power source that provides high conversion efficiency and
low distortion output. It has a universal line output terminal and has a built in
PFC to provide an input power factor of 0.99 at full load. The output AC provides
up to 1500 VA and can be set to two voltage ranges, 135 V and 270 V. Front
panel buttons and control knob is available for quick voltage and frequency set.
A RS232 interface port is provided in the rear panel for remote programmability.
1.2 FEATURES
• Low distortion sine-wave output with programmable frequency and
voltage.
• Selectable two output voltage ranges: 135VAC or 270VAC
• Settable frequency from 45Hz to 450 Hz.
• Built-in torroidal isolation transformer.
• Automatic protection against overload, short circuit and over
temperature.
• Bright VFD display
• Remote Programming through RS 232 serial interface.
• Built in PFC provides 0.99 input power factor.
• Conforms to EN 55022, class A, safety standard EN 60950.
1.3 SPECIFICATIONS
The operation specifications are listed below. All specifications are tested at the
output terminal, with temperature at 25 °C ± 5°C, nominal input of 120V
AC/230V AC and output of 250VAC/125VAC, and at 50Hz/60Hz with a resistive
load.
Model
1657
INPUT
Voltage
90 – 264 VAC single phase
100 – 264 VAC for continuous full load operation
Frequency
47 – 63 Hz
Current
20A Max.
Power factor
0.99 typical. @115 VAC 60 Hz, Full Load
Efficiency
> 85% at full load & nominal line input
OUTPUT
Output Power
Maximum Power
1500 VA
Accuracy
+/- 2% of F.S.
Resolution
1 W
Output Voltage