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Testpoints for Voltage Settings

At midrange on these scales, a testpoint is provided for use with a DC

digital voltmeter for assuring more accurate adjustment. The pots are equipped

with removable knobs to prevent accidental adjustments by the curious or

uninformed. If the knobs are missing, a 5/64" hex-head driver can be used to

adjust the settings. A digital voltmeter can be connected from the COMMON

NEGATIVE terminal on the circuit board and the small testpoint located to the left

of each adjustment pot at the nine oclock position. The testpoint provides a

reading from 0 to 2 volts; this value must be added to the lower value of the

adjustment range (Bulk=13.0, Float=12.5, LVR=12.0, LVD=10.5). Multiply this

value by 2 for 24 V and by 4 for 48 V.

For example, to set the bulk voltage to 14.4 volts, adjust the potentiometer

until the DVM displays 1.4 volts (13.0 V + 1.4 V = 14.4 V). To set bulk to 28.2,

adjust the pot until the DVM displays 1.10 volts (1.10 x 2 [24 volt] = 2.2 + 26.0 =

28.2). When using NiCad type batteries, add another 2 (12-volt), 4 (24-volt) or 8

(48-volts) to the settings.

If you are using the unit as a DC load controller, be sure to set the

potentiometers as shown in the DC Load Control section of this manual. The

upper knobs settings are reduced by 1 volt, resulting in a range of 14.0 VDC to

12.0 VDC (for a 12-volt system). The lower knobs settings are reduced by

2volts, resulting a range of 12.5 to 10.5 VDC (for a 12-volt system).

3.0 INSTALLATION

Figure 18

DC Testpoints for Bulk and Float

Load Control Mode (sticker)

Figure 19

DC Load Control Adjustment Sticker

TESTPOINTS

for DC multimeter

(center legs of potentiometer)

Connect the negative lead of

DVM to the COMMON

NEGATIVE terminal

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Xantrex Trace C Series User Manual

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