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www.atkinsonelectronics.com Circuit Board Division

800.261.3602 Revised 05/19

SEDM6-40 Description of Operation

The SEDM6-40 display module serves as a remote digital readout for either the PVCM40D-MPT or

PVCM40D-SE2 charge controller. The SEDM4-25 display module serves as a remote digital readout for

the PVCM25D charge controller. The display units and controllers are not interchangeable. The

PVCM40D-MPT charge controller contains an internal solar current shunt, RJ-45 network jack and

associated internal wiring to provide power and signals to the SEDM display unit through a standard

computer network patch cable which plugs into the RJ-45 jack on the back of the SEDM.

If the wrong configuration network cable, such as the crossover type, is used then the error LED on the

back of the SEDM6-40 will light indicating that the wrong type cable has been plugged in for the display.

The SEDM6-40’s normal display indication is Battery Percent Remaining and its associated LED. The

select button allows the user to turn on the displays backlight, advance to the next display setting, reset

the solar Amp hour accumulator, force the PVCM40D-MPT into a bulk charge routine to top off the

battery voltage, lock display or current setting, or activate scroll mode (see page 15). The SEDM6-40 will

automatically switch back to the battery percent remaining display setting after 4 minutes unless the

display setting lock is activated. The backlight will come on for 15 seconds any time the select button is

pushed and will stay on continuously in scroll mode.

If a low battery voltage condition occurs, the display will automatically switch to the battery voltage

setting and blink the display reading and battery voltage LED. If the user accesses other display settings

while in this condition, they will be displayed for 5 seconds then switch back to battery voltage setting

until the low battery voltage problem is corrected. Any accumulated values may be meaningless if the

battery voltage remains below 10V as the minimum voltage for the SEDM6-40 to operate properly is

10VDC. The SEDM6-40 display will continue to accumulate Amp-hours, they won’t be displayed without

reverting back to the flashing battery voltage after 5 seconds.

If the charging Status LED is green, the user can scroll down to the charging status position. The user can

tell the charge controller to top-off the battery(s), provided there is sufficient PV voltage to do so. This is

done by pressing the select button and holding it, this will cause the display to blink the ‘n_c’ 3 to 4 times

telling the controller to go into charge mode. The LED color changes to red and the display indicates

‘chr’, then release the select button The display will then alternate between solar charge Amps and

battery voltage, switching every 10 seconds, (backlight will be on during the charging cycle), until the

charge cycle is complete, in which the display then returns to battery percent remaining.. You can exit

display cycle by pressing the Select button.

Atkinson Electronics PVCM40D-MPT User Manual

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