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WARNINGS
Only properly qualified personnel may work on or around this equipment.
!
The successful and safe operation of this equipment is dependent on proper handling, storage and installation. Correct functioning is also
dependent on the use of SITOP battery modules (e.g. battery modules of type 6EP1935-6MD11, 6EP1935-6MD31, 6EP1935-6ME21or 6EP1935-
6MF01.
The charging current level and the end-of-charge voltage must be adjusted with DIP-switches to the settings recommended under "Technical
Data". Setting incorrect current and voltage values reduces the life of the battery and may cause irreparable battery damage.
CAUTION
Only trained personnel may open the unit. Electrostatically sensitive devices (ESD)
Description and Design
The DC-UPS module 15 is a chassis unit in the SITOP power product range for mounting on a DIN rail of type DIN EN 50022-35x15/7.5.
The modules and the battery modules must be installed in accordance with the applicable DIN/VDE specifications or pertinent regulations in the country of installation (e.g. VDE 0510 Part2 / EN
50272-2).
In conjunction with the battery module, it buffers a proportion of the load current (max. 6A) of 24V load current supplies in the SITOP range.
Input "Input L+" on the DC-UPS module must be connected to output L+ of the 24V DC power supply unit and input "Input M" to output M of the power supply unit. The battery module is connected
to terminals +Bat and –Bat. The loads to be buffered are supplied via outputs "Output L+" and "Output M" on the DC-UPS module with the voltage connected to the input. If the 24V DC supply
voltage fails or drops below the set cut-in threshold, the battery module, which is maintained at full charge in continuous supply mode, is connected in to supply the loads.
The battery cut-in threshold, end-of-charge voltage, charging current and the buffering time can be set via DIP-switches. A switch is provided for setting a defined buffering (stored energy) time with
subsequent disconnection of the battery (see Settings).
The operating states of the DC-UPS module 6 are signaled by four LEDs, two floating changeover and one normally-open contacts and a serial interface (6EP1931-2EC31 only) or USB-interface
(6EP1931-2EC42 only) (see Signaling) and the control signal "Remote Timerstart".
Technical Data
Input quantities:
Rated input voltage:
Operating voltage range:
Max. input current at 24V and battery charging:
Max. input current at 24V and charged battery:
Battery current in floating operation:
Max. quiescent current consumption of the battery
Power loss at 24V and battery charging:
Power loss at 24V and charged battery:
Power loss in floating operation:
Settings
Setting the cut-in threshold:
If the input voltage drops below the selected cut-in threshold voltage, the UPS module switches over to floating operation. The loads are then supplied solely by the battery module. The cut-in
threshold is set via three DIP-switches (see page 2 for position) according to table 2 (see page 7).
Setting range: 22.0 to 25.5V DC in 0.5-steps (delivery state: 22.5V DC ± 0.1V), accuracy ± 1.8%
Setting the charging current:
The end-of-charge voltage depends on the battery type and on the battery`s ambient operating temperature. Table 1 (see page 7) shows the end-of-charge voltages for specific battery modules at
different temperatures. It is possible to interpolate between these values. The voltage is set by six DIP-switches (see page 2 for position) according to table 3 (see page 7).
Setting range: 26.3 to 29.2V DC in 0.1V-steps (delivery state: 26,6V DC ± 0.1V for +40°C lead-gel-battery temperature), accuracy ± 0.7%V DC
Note: for lower temperatures (recommended optimum temperature +20°C ... +25°C) increase the end-of-charge voltage according to table 1 !
Setting the end-of-charge voltage:
The end-of-charge voltage depends on the battery type and on the battery´s ambient operating temperature. Table 1 (see page 7) shows the end-of-charge voltages for specific battery modules at
different temperatures. It is possible to interpolate between these values. The voltage is set by six DIP-switches (see page 2 for position) according to table 3 (see page 7).
Setting range: 26.3 to 29.2V DC in 0.1V-steps (delivery state: 27.0V DC ± 0.1V for +25°C lead-gel-battery temperature), accuracy ± 0.7%
Setting the operating state ON/OFF:
Caution: For normal operation "ON" state is necessary (delivery state is "OFF"), in order to achieve that use DIP-switch closed or terminals X2.8 and X2.9 connected with X2.10
To prevent the battery from being discharged unintentionally (e.g. when the system power is disconnected), the DC-UPS module can be switched with a DIP-switch (or a wire jumper (or floating
connection) inserted between terminals X2.9 and X2.10) to operating state "OFF" (delivery state). In the "ON" state (DIP-switch closed or terminals X2.8 and X2.9 connected with a floating
normally-open contact (V
= 15V DC, I
max
when the mains supply is disconnected but remains functional in every other respect. If the module is switched to "OFF" in floating operation, it stops operating in floating mode.
During normal operation, the polling interval for the ON/OFF setting is appr. 20s.
Setting the buffering time:
The buffering time is set via six DIP-switches (see page 2 for position) as illustrated in Table 4 (see page 7) in 10s-steps from 5s to 635s. By switch 1 (delivery state max. time) you can choose
whether floating operation will be terminated after a prespecified period or when the exhaustive discharge threshold of the battery (= maximum buffering time) is reached (delivery state: max.
buffering time). Using a 6EP1931-2EC31 or 6EP1931-2EC42 the remote signal starts the timer to terminate after a prespecified period (switch 1 has to be in position Off and switch interruption in
position On). Once the battery has been disconnected, there is no way in which floating operation can be restarted again by altering the switch setting. Only when the input voltage has recovered
floating operation can be resumed. The buffering time is a minimum of 10 minutes until discharge to 20.4V DC with a charged battery module type 6EP1935-6MD11 (3.2Ah) and a load current of
5A. (requires a new battery modul with a temperature of the battery above +20°C)
Interruption of the output voltage:
By a DIP-switch you can choose if the output voltage is interrupted for 5 s at the end of the buffering time or not (delivery state : no interruption). Using a 6EP1931-2EC31 or 6EP1931-2EC42 and
set "max. time" an interruption is started by the remote signal.
Protective and Monitoring Functions
Reverse polarity protection:
Overcurrent and short-circuit protection:
1.05 to 1.4 I
for appr. 80ms at a overcurrent) in normal and floating operations. An internal 16A-fuse (not accessible) protects the module in case of failure. In normal operation automatic restart
N
attempts are made appr. every 20s. In floating operations the module shuts down in store mode. Restart after return to normal operation.
Exhaustive discharge protection:
reduce their service life and may result in irreparable battery damage. In order to protect the battery against damage, the UPS module is shut down in store mode and the loads disconnected from
the battery as soon as the battery voltage drops below typ. 19V DC (range 19.5 to 18.5V DC) in floating operation.
Battery test:
In order to guarantee reliable floating operation, the battery module must be checked to ensure that it is fully functional. For this reason, the connected battery module is tested
every 4 hours under normal operation. The test is carried out only if the battery has not operated in floating mode or been disconnected within this 4 hour period. The battery test is not performed for
applications in which floating operation is activated regularly at shorter intervals. A defective battery is signaled by a flashing alarm and must be replaced then.
Important note changing rechargeable batteries:
blinking alarm (red LED and alarm relay) turns off only up to 4 hours ! When exchanging to not completely charged batteries the blinking or constantly occurent alarm (when battery voltage <
18,5V) may persist even longer (e.g. 8 or 12h !).
Siemens AG Österreich, 07/2007
24V DC
22 to 29V DC
16.0A DC
15.1A DC
15.1A DC
appr. 0.3mA
appr. 16.0W
appr. 14.0W
appr. 15.0W
= 10mA) ), the DC-UPS module is fully functional according to specification. In the "OFF" state, the module does not switch over to floating operation
max
The UPS module is electronically protected against polarity reversal of the input voltage and battery.
The UPS module is protected by an internal current limitation (typ. 25 to 40A for appr. 20 ms at a short-circuit,
Lead-acid batteries may only be discharged down to a certain voltage (exhaustive discharge threshold). Allowing them to discharge further will
if you change rechargeable batteries with red alarm blinking under current operation (i.e. without switching off 24V DC), red
Output quantities:
Rated output DC voltage:
V
Rated output direct current:
I
A1
Output current range:
I
A1
Output characteristic of charging regulator:
The battery module is charged at an adjustable constant current until the
set end-of-charge voltage is reached.
End-of-charge voltage: V
= 26.3 to 29.3V DC
A2
Charging current:
I
= 0.35 or 0.7A DC
A2
5 of 8
English
= 24V DC
A1
= 15A DC
= 0 ... 15A DC
SITOP DC-USV-Modul 15
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