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To adjust the settings, appropriate test equipment is necessary (depending on the adjustment). A variable
load, a variable DC power supply, and an accurate voltage and current meter are required. The SPS should be
unscrewed from its mounting. The SPS must be disconnected from the battery and load. The adjustment trimpots
are accessible on the rear side of the rectifier, with the AC input oriented to the left, the trimpots read as follows.
4.1 Standard Settings
Item
Boost Voltage
Float Voltage
Boost to Float Current
Over Voltage Shutdown
Temp Comp 25° C
Temp Comp 5°
LVD On Voltage
LVD Off Voltage
Current Limit
Trimpot View Orientation: From back of unit with AC input socket
4.2
Adjust Float Voltage
Connect a variable load (set to minimum load) to the battery connections of the rectifier. Disconnect the
Temperature Compensation Probe. Connect an accurate voltmeter across the load. Turn on AC to the unit. Wait
approximately 10 seconds for it to switch back to Float Charge mode. Check that the LEDs indicate Float Charge
mode.
Adjust the Float Voltage trimpot to set the required float voltage.
4.3
Adjust Boost Voltage
Connect a variable load (set to minimum load) to the battery connections. Disconnect the Temperature
Compensation Probe. Connect an accurate voltmeter across the load. Turn on AC to the unit and adjust the load
until the unit goes into Boost Charge mode (as indicated on the LEDs).
Note that there is a 10 second delay when switching from Boost Charge mode to Float Charge mode, but no delay
when switching from Float to Boost.
Adjust the Boost Voltage trimpot to set the required boost voltage.
P.O. Box 1306
Newport Beach
California 92663
SPS 12-20
14.2V
13.7V
2A
16V
13.7V
14.06V
12V
10V
20A
Float
Voltage
Current
Limit
LVD
Voltage
LVD
Hystersis
SPS 24-10
28.8V
27.4V
1A
32V
27.4V
28.32V
24V
20V
10A
Boost
Voltage
Temp Comp
Slope
Boost to Float
Current
Over-Voltage
Shutdown
E-Mail: techservice@newmarpower.com
SPS 48-6
57V
54V
0.5A
60V
54V
55.9V
48V
40V
6A
on left.
11
Phone: 714-751-0488
Fax: 714-957-1621
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