User Manual

Page 81
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PSB 9000 2.5 kW Series
3.11.16 Battery test function
The purpose of the battery test function is to charge and discharge various
battery types in industrial product tests or laboratory applications. Addition-
ally,theso-calleddynamictestmodecombinesacertainowofchargeand
dischargephaseswhileo󰀨eringfullcongurability,forexamplewhichphase
startsrstorhowmuchtimeinbetweenboth(pause)phaseshastoelapse
or how often the charge/discharge cycle is going to be repeated.
There is a choice between modes “Static discharge” (constant current), “Dynamic discharge” (pulsed current),
“Static charge” (constant current) and “Dynamic test” (owofcharge/discharge).
In static discharge mode which by default runs in constant current (CC), the settings for power or resistance
can also let the device run the function in constant power (CP) or constant resistance (CR). Like with the normal
operationofthedevicethesetvaluesdeterminewhatregulationmode(CC,CP,CR)willbeine󰀨ect.If,forexam-
ple, CP operation is projected, the set value of current should be set to maximum and resistance mode should be
turnedo󰀨,sothatbothdon’tinterfere.ForaprojectedCRoperationit’ssimilar.Currentandpowershouldthen
be set to maximum.
For dynamic discharge mode there is also a power setting, but it can’t be used to run the dynamic battery test
function in pulsed power mode or at least the result would not be as expected. It’s recommended to always adjust
the power value according to the test parameters, so it doesn’t interfere with the pulsed current.
When discharging with high currents and in dynamic mode, it may happen that the battery voltage
shortly drops below the discharge end voltage (U-DV) threshold and the test will unintentionally
stop. Here it’s recommended to adjust U-DV accordingly.
Graphical depiction of both discharging modes:
U, I
t
Discharge current
Start
U-DV
Stop
U, I
t
Discharge current
Start
U-DV
Stop
Static discharge Dynamic discharge
The static chargebasicallyfollowsthechargingproleusedforlead-acidbatteries.Thebatteryischargedwitha
constantcurrentuntilitreacheseitheraspeciedchargingendvoltageorachargingendtimeorwhenthecharging
currentfallsbelowthespeciedchargingendcurrentthreshold.
Graphical depiction of the static charging mode:
U, I
t
Charge current
Star t
Stop
The fourth mode is called “Dynamic test” and combines “Static discharge” with “Static charge” inoneow.
Thesameparametersforthesingletestpartsareavailable,plussomeextrafortheow.Youcan,forexample,
selectwhatcomesrst,chargeordischarge.Thereisalsoanoptiontocyclethetest,i.e.repeat1to999times
orinnitelyandyoucandenearestingperiodwhichelapsedbeforethenextcycle.