User manual

Page 49
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
EL 3000 B Series
3.9.9 Battery test function
The purpose of the battery test function is to discharge various battery types in industrial product tests or labora-
tory applications. It is only available via access on the HMI, at least as setup and use are described below, but can
also be achieved in remote control using the arbitrary function generator. The only disadvantage in remote control
are the missing counters of battery capacity (Ah), energy (Wh) and time. But those can be calculated by custom
remote control software when programming a time counter and regularly querying actual values from the device.
The function is usually applied on the DC input current and can either be selected and run in “Static” (constant
current) or “Dynamic” (pulsed current) mode. In static mode, the settings for power or resistance can also let
the device run the function in constant power (CP) or constant resistance (CR). Like in the normal operation of the
load the set values determine what regulation mode (CC, CP, CR) is resulting on the DC input. If, for example, CP
operation is projected, the set values of current should be set to maximum and resistance mode should be turned
off (here: setting the R value to “OFF”), so that both don’t interfere. For a projected CR operation it is similar. There
current and power should be set to maximum.
For dynamic mode there is also a power setting, but it cannot be used to run the dynamic battery test function in
pulsed power mode or at least the result would not be as expected. It is recommended to adjust the power values
always according to the test parameters, so it doesn’t interfere with the pulsed current, i. e. dynamic mode.
When discharging with high currents, compared to the nominal battery capacity and in dynamic mode, it may happen
that the battery voltage shortly drops below the threshold “Discharge voltage” (U
DV
) and the test will unintentionally
stop. Here it is recommended to adjust the threshold accordingly.
Graphical depiction of both battery test modes:
U, I
t
Discharge current
Start
U-DV
Stop
U, I
t
Discharge current
Start
U-DV
Stop
Static Dynamic
3.9.9.1 Parameters for static mode
Thefollowingparameterscanbeconguredforthestatic battery test function.
Value Range Description
I 0...Nominal value of I Maximum discharge current in Ampere
P 0...Nominal value of P Maximum discharge power in Watt
R Min....max. nominal value of R MaximumdischargeresistanceinΩ(canbedeactivated-->“OFF”
3.9.9.2 Parameters for dynamic mode
Thefollowingparameterscanbeconguredforthedynamic battery test function.
Value Range Description
I1 0...Nominal value of I
Upper resp. lower current setting for pulsed operation (the higher
value of both is automatically used as upper level)
I2 0...Nominal value of I
P 0...Nominal value of P Maximum discharge power in Watt
t1 1 s ... 6000 s t1 = Time for the upper level of the pulsed current (pulse)
t2 = Time for the lower level of the pulsed current (pause)
t2 1 s ... 6000 s