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Gossen Metrawatt GmbH
2.6
Battery Discharge Operation
The electronic load adopts constant current discharge to test the battery capacity. The
discharge current
and
cut-off voltage
can be self-
defined. When the battery voltage decreases to the cut-off voltage, the battery discharge test will stop automatically. The test proce-
dure is shown in Figure 2.10. The load can real-time display battery voltage, discharge current, discharge time, and discharge capacity
during the test. The maximum battery discharge time is 99 hours, 99 minutes, 99 seconds, with a maximum battery capacity of
4000 Ah (SPL 400-40), 3000 Ah (SPL 350-30, SPL 250-30), 2000 Ah (SPL 200-20).
Figure 2.10 Voltage/Current Curve Chart in Battery Discharge Operation
2.7
Short Circuit Operation
The electronic load can simulate a short circuit to test the protection performance of the tested device. The short circuit operation can
be enabled and disabled by setting in the main menu, or via the remote command (INPut:SHORt ON/OFF). The other set values will not
be changed when the short circuit operation is enabled. The short-circuit value depends on the present operating mode of the load,
and the short-circuit value for each model is shown as follows:
Example for SPL 400-40
CCL, Short Circuit Current
4.4 A
CCH, Short Circuit Current
44 A
CV, Short
Circuit
Voltage
0 V
CRL, Short Circuit Resistance 1.8
Ω
.
CRH, Short Circuit Resistance 18
Ω
.
CPV, Short Circuit Power
420 W
CPC, Short Circuit Power
0 W
The other setting values remain unchanged for short circuit operation.
Attention!
!
In short circuit operation, the Von point and current limit level should be taken into consideration, which may cause the shut
down of the input, thus interrupt the short circuit operation.
Cut-off Voltage
Discharge Current
Battery Voltage
I
V
t
t
