Setting The On/Off Operating State; Compatibility; Signaling; Normal Mode - Siemens SITOP DC UPS 6EP1931-2DC21 Considerations For Use

2.7 Setting the ON/OFF Operating State

To prevent an unintentional discharge of the battery (e.g. by deactivating the plant), the DC UPS module can be
activated using DIP Switch 9 (or through a floating connection, wire jumper, or X2.9 and X2.10 terminals) in the
OFF operating state (delivery state). DIP Switch 9 and the X2.9 and X2.10 terminals are switched electrically
parallel. In the "ON" operating state, (DIP switch closed or Terminal X2.9 with X2.10 with floating make contact
for Umax = 15 VDC, Imax. = 10mA connected or X2.9 grounded), the DC UPS module provides full functionality
according to the specifications. In the "OFF" operating state, no switch to buffer mode takes place if the supply
voltage is disconnected. All other functions are retained. If the UPS module is switched to OFF during the buffer
mode, the buffer mode thus comes to an end as well. In normal mode, the ON/OFF setting is polled
approximately every 20s.
Switch position: On = 1; Off = 0
Switch 9 at Pos. On: Operating state ON
Switch 9 at Pos. Off: Operating state OFF
Table 8: Selecting the operating mode

2.8 Compatibility

DIP Switch 10 "Compatibility" exists only on the SITOP 40A DC UPS module (6EP1931-2FC21 and 6EP1931–
2FC42). In this way the "Analogous to new DC UPS family" or "Analogous to previous DC UPS module 40
6EP1931-2FC01" signaling can be selected.
Switch position: On = 1; Off = 0
Switch 10 at Pos. On: Signaling analogous to previous DC UPS module 40 6EP1931-2FC01
Switch 10 at Pos. Off: Signaling analogous to new DC UPS family
Table 9: Selecting the compatibility

3. Signaling

3.1 Normal Mode

The input voltage on the DC UPS module is higher than the set cut-in threshold. The consumers are supplied
by the upstream power supply. In case a battery module is connected, it is charged. In normal mode, the green
LED (OK) lights up and the X2.2 – X2.3 (OK) relay contact is made.

3.2 Full Charge

The battery charge is greater than 85%. The second green LED (Bat>85%) lights up and the X2.7 – X2.8 relay
contact is made.
If the second green LED is off and the X2.7 – X2.8 relay contact is made (idle position in case of deactivated
device), this means "Bat<85%," i.e. the battery charge is under 85%.

3.3 Buffer Mode

The input voltage is lower than the set cut-in threshold. The consumers are supplied by the battery module. In
buffer mode, the yellow LED (Bat) lights up and the X2.1 – X2.2 relay contact (Bat) is made (idle position in
case of deactivated device).
© Siemens AG, 2009 7/18