© EPS Stromversorgung in 2022, this information is subject to change without notice
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30000800_manual_psb_10000_4u_30kw_en_04
3.11.16
Battery test function
The battery test function is only a feature to test batteries. It has no battery management functionality.
It means, that there is no monitoring of single battery cells. Dead cells cannot be detected and in case
there is at least one dead cell in a battery when being charged or discharged by the device, the battery
could be destroyed. External battery management hardware and software might be required.
The purpose of the battery test function is to charge and discharge various
battery types in industrial product tests or laboratory applications. Besides
separate modes for charging and discharging of a battery, there is also a
combination of both available, the so-called dynamic test. This form of test
flow is available on the HMI as well as in
EPS
Power Control
(license based
extra which isn’t free of charge), but not in digital or analog remote control.
Users programming the device in remote control can achieve a similar flow by
configuring the charging test separately from the static or dynamic discharge
test and control everything accordingly.
There is a choice of modes:
Static discharge
(constant current),
Dynamic discharge
(pulsed current),
Static charge
(con-
stant current) and
Dynamic test
(flow 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 effect. If, for example, CP operation is projected, the
set value of current should be set to maximum and resistance mode should be turned off, 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 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
Stop
I
t
Max. Ah
Max. t
C
C
R
R
D
Discharge end voltage
U, I
t
Discharge current
Start
Stop
Discharge end voltage
Ah
Ah
Static discharge
Dynamic discharge
The
Static charge
basically follows the charging profile used for lead-acid batteries. The battery is charged with a constant
current until it reaches either a specified charging end voltage or a charging end time or when the charging current falls be
-
low the specified charging end current threshold.
Graphical depiction of the static charging mode:
U, I
t
Charge current
Start
Stop