P.O. Box 1306
Newport Beach
California 92663
Phone: 714-751-0488
Fax: 714-957-1621
E-Mail: [email protected]
1
Principles of Operation
1.1
Introduction
The SPS Series range of freestanding convection cooled wall-mount power systems consists of the following models:
Output
Model
Input
Volts
Max Input
Current
Frequency
Range
Nominal
Voltage
Rated
Voltage
Voltage
Range
Maximum
Current
Power
Rating
SPS 12-20
85 - 275
VAC*
4A @ 110V
2A @ 220V 45 - 100 Hz.
12V
14.5V
11.5 - 15V
20A
300W
SPS 24-10
24V
29V
22 - 30V
10A
300W
SPS 48-6
48V
58V
45 - 60V
6A
300W
* 85 - 100 VAC: Reduced output power
The SPS units feature:
• Convection Cooling
• Automatic Boost/Float Charge cycle
• Thermal Protection
• Active Load Sharing when operated in parallel with
another rectifier
• Power Factor Corrected
• External Alarm and Control interface
• Input/Output Voltage and Current Protected
• Bar Graph Current Indicator
• Temperature Compensation
• Integrated Alarm Outputs
• 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.
AC On:
This LED glows green to indicate that AC power is connected to the unit and that the primary
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
v 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
2