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Principles of Operation
1
1.1
Introduction
The SPS Series range of freestanding convection cooled wall-mount power systems consists of the following models:
Input
Model
Volts
SPS 12-20
85 - 275
SPS 24-10
VAC*
SPS 48-6
* 85 - 100 VAC: Reduced output power
The SPS units feature:
• Convection Cooling
• Thermal Protection
• Power Factor Corrected
• Input/Output Voltage and Current Protected
• Temperature Compensation
• Built in LVD - Battery Low Voltage Disconnect
1.2
LEDs
There are 4 LEDs that indicate the operational state of the rectifier. These LEDs can be used to determine the
present state of the rectifier and diagnose faults.
This LED glows green to indicate that AC power is connected to the unit and that the primary
AC On:
stages of the rectifier are operating.
Shutdown Mode LED:
• Yellow – Rectifier in "Current Limit"
• Red – Rectifier shutdown through over voltage or over temperature.
Float/Boost LED:
• Green – Rectifier operating in "Float Charge" mode
• Yellow – Rectifier operating in "Boost Charge" mode
Temperature Probe LED:
• Green – Temperature Compensation Probe connected and within limits
• Red – Rectifier has failed– also lights if the output voltage is externally forced above the rectifier output
voltage + 4.5%. Powered from the battery. Off if the LVD has tripped.
• Note that if the Temperature Compensation Probe is connected and the rectifier fails, the LED may not
show. The monitor external signals are still correct. To verify the condition, unplug the Temperature Com
pensation Probe.
1.3
Display
A row of LEDs on the front panel indicates the approximate current output from the rectifier (note only 1 LED is lit
at any one time).
1.4
Auto Float Boost
When the SPS is powered on, it starts in Boost Charge mode. If the battery charge current is above the 'Boost to
Float" Current threshold, it will stay in Boost Charge mode. When the battery charge current falls below
P.O. Box 1306
Newport Beach
California 92663
Max Input
Frequency
Current
Range
4A @ 110V
45 - 100 Hz.
2A @ 220V
Nominal
Rated
Voltage
Voltage
12V
14.5V
11.5 - 15V
24V
29V
48V
58V
• Automatic Boost/Float Charge cycle
• Active Load Sharing when operated in parallel with
another rectifier
• External Alarm and Control interface
• Bar Graph Current Indicator
• Integrated Alarm Outputs
Output
Voltage
Maximum
Range
Current
20A
22 - 30V
10A
45 - 60V
6A
Phone: 714-751-0488
Fax: 714-957-1621
E-Mail: techservice@newmarpower.com
Power
Rating
300W
300W
300W
2
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