2.2 Setting the End-of-Charge Voltage
The end-of-charge voltage depends on the respective battery type, as well as on the temperature to which it is
exposed. Table 2 contains the end-of-charge voltages for the given battery modules at various temperatures. It
is possible to interpolate between the values. The end-of-charge voltage is set using six DIP switches (for
position, see Figure 2) according to Table 3.
Setting range:
26.3 to 29.3 VDC in 0.1V steps (delivery state: 27.0 VDC
0.1V for +25°C lead-gel battery temperature).
Precision:
0.7%
Battery module/battery: 6EP1935-6MC01, 6EP1935-6MD11, 6EP1935-6ME21, 6EP1935-6MF01:
-10°C
29.0V
0°C
28.4V
10°C
27.8V
20°C
27.3V
25°C
27.0V
30°C
26.8V
35°C
26.7V
40°C
26.6V
Battery module/battery: 6EP1935-6MD31
-10°C
29.0V
0°C
28.6V
10°C
28.3V
20°C
27.9V
25°C
27.7V
30°C
27.5V
35°C
27.4V
40°C
27.2V
45°C
27.0V
50°C
26.8V
60°C
26.4V
Table 2: End-of-charge voltages at other battery temperatures
end-of-charge voltage [ V ]
Table 3: Setting the end-of-charge voltage at other battery temperatures [ V ]
2.3 Setting the Charging Current
The battery module is charged using constant current until the set end-of-charge voltage is reached. The
charging procedure is then complete. During the setting of the charging current, the data for the battery module
used must be observed when selecting the optimum setting. The charging current is set using a DIP switch (for
position, see Figure 2).
Setting ranges:
SITOP DC UPS 6
(6EP1931-2DC21, -2DC31, and -2DC42):
0.2A DC
0.075A DC or 0.4A DC
0.075A DC (delivery state: 0.4A DC
0.075A DC)
SITOP DC-UPS 15
(6EP1931-2EC21, -2EC31, and -2EC42):
0.35A DC
0.1A DC or 0.7A DC
0.1A DC (delivery state: 0.7A DC
0.1A DC)
SITOP DC-UPS 40
(6EP1931-2FC21 and -2FC42):
1A DC
0.2A DC or 2A DC
0.2A DC (delivery state: 2A DC
0.2A DC)
SITOP UPS500S
(6EP1933-2EC41 und –2EC51):
1A DC oder 2A DC (delivery state: 1A DC)
Switch position: On = 1; Off = 0
For SITOP DC-UPS 6:
Switch 10 at Pos.
On: Charging current 0.2A DC
Off: Charging current 0.4A DC
For SITOP DC-UPS 15:
Switch 10 at Pos.
On: Charging current 0.35A DC
Off: Charging current 0.7A DC
For SITOP DC-UPS 40:
Switch 10 at Pos.
On: Charging current 1A DC
Off: Charging current 2A DC
For SITOP UPS500S:
Switch 10 at Pos.
On: Charging current 1A DC
Off: Charging current 2A DC
Table 4: Setting the charging current
© Siemens AG, 2009
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