© Siemens AG 2016
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von 8
SITOP UPS 500S
A5E38474162, 08.2016
SITOP UPS 501S
English
!
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 ultra modules
CAUTION
Only trained personnel may open the unit.
Electrostatically sensitive devices (ESD)
Disposal Guideline
Packaging and packing aids can be recycled and should always be disposed of for reuse.
The product itself shall not be disposed of as normal domestic waste.
Description and Design
The DC-UPS 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 basic units and the expansion modules must be installed in accordance with the applicable DIN/VDE specifications or pertinent regulations in the country of
installation.
It buffers a proportion of the load current (max. 15A) of 24V load current supplies in the SITOP range.
Input "Input L+" on the DC-UPS basic units 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. It
is possible to connect max. 3 expansion modules via the connectors X10 and X30. The loads to be buffered are supplied via outputs "Output L+" and "Output M" on the
DC-UPS basic unit with the voltage connected to the input. If the 24V DC supply voltage fails or drops below the set cut-in threshold, the expansion module or the
internal capacitors are connected in to supply the loads.
The cut-in threshold, charging power 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 (see Settings), one switch for bridging the ON/OFF circuit, one switch for choosing if the output voltage is interrupted for 5 s at the end of the
buffering time or not.
The operating states of the DC-UPS basic unit are signaled by four LEDs, two floating changeover and one normally-open contacts and a USB-interface (see Signaling)
and the control signal “Remote Timerstart” and “Shutdown”.
Technical Data
Input quantities:
Rated input voltage: 24V DC
Operating voltage range: 22 to 29V DC
Max. input current at 24V and capacitor charging: 17.5A DC
Max. input current at 24V and charged capacitors: 15.2A DC
Power loss at 24V and capacitor charging: appr. 11.0W
Power loss at 24V and charged capacitors: appr. 9.0W
Charging time with low charging power and basic unit -2EC41/-2EC51: appr. 110s / 220s
Charging time with high charging power and basic unit -2EC41/-2EC51: appr. 55s / 120s
Charging time with low charging power and basic unit -2EC41/-2EC51 and one expansion
module: appr. 320s / 430s
Charging time with high charging power and basic unit -2EC41/-2EC51 and one expansion
module: appr. 160s / 220s
Output quantities:
Rated output DC voltage: VA1 = 24V DC
Rated output direct current: IA1 = 15A DC
Output current range: IA1 = 0 … 15A DC
Output characteristic of charging regulator:
The capacitors are charged at an adjustable constant power until the
end-of-charge voltage is reached.
End-of-charge voltage: V = 21.8V DC
Charging current: P = 1 or 2A
Buffering time at 15A load current with basic unit -2EC41/-2EC51: tp =
3s / 9s (typ.)
Buffering time at 15A load current with basic unit -2EC41/-2EC51 and
one add-on expansion module: tp = 15s / 20s (typ.)
(see diagram 1 on page 7)
Settings
Setting the cut-in threshold:
If the input voltage drops below the selected cut-in threshold voltage, the DC-UPS basic unit switches over to floating operation. The loads are then supplied solely by the
DC UPS. The cut-in threshold is set via three DIP-switches (see page 2 for position) according to table 1 (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 expansion module or the internal capacitors are charged via constant current until the set end-of-charge voltage is reached. Charging is then terminated. The
setting of the charging current determines how quickly the buffer ready state is restored after a discharging process. The charging current is set by a DIP switch (position
see page 2). Setting range: typ. 1A or typ. 2A (delivery state: 1A)
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 capacitors from being discharged unintentionally (e.g. when the system power is disconnected), the DC-UPS basic unit 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
max
= 15V DC, I
max
= 10mA) ), the DC-UPS basic unit is fully functional according to
specification. In the "OFF" state, the module does not switch over to floating operation when the mains supply is disconnected but remains functional in every other
respect. If the DC-UPS basic unit 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 five DIP-switches (see page 2 for position) as illustrated in Table 2 (see page 7) in 10s-steps from 5s to 315s. By switch 5 (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 capacitors (=
maximum buffering time) is reached (delivery state: max. buffering time). Using the remote signal starts the timer to terminate after a prespecified period. Once the
buffering has been terminated, 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 appr. 3s with fully charged capacitors and a load current of 15A.
Interruption of the output voltage:
By a DIP-switch (see page 2 for position) 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 the setting “max. time” an interruption is started by the remote signal.
Protective and Monitoring Functions
Reverse polarity protection:
The DC-
UPS basic unit is electronically protected against polarity reversal of the input voltage.
Overcurrent and short-circuit protection
:
In normal operation and floating operation the DC-UPS basic unit is protected by the internal dynamic current
limitation and the internal static current limitation. Dynamic current limitation limits the output current to typ. 25A. Static dynamic limitation shuts down the output if
currents are greater than typ. 18A after about 110ms at short-circuit, and after about 200ms at overload. An internal (not accessible) 20A fuse protects the module in the
event of a fault. In normal operation automatic restart attempts are made approximately every 20s. In floating operation the module shuts down in store mode. Restart
after return to normal operation.
