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Protective and Monitoring Functions
Reverse polarity protection:
Overcurrent and short-circuit protection:
operation. The fuse on the battery module protects the UPS module against overcurrent in floating operation. An internal current limitation disables floating operation
from a battery current of typically 25-40A. Automatic restart attempts are made every 20 s.
Exhaustive discharge protection:
discharge further will 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 18.5V DC in floating operation.
Battery test:
In order to guarantee reliable floating operation, the battery module must be checked to ensure that is it fully functional. For this reason, the connected
battery module is tested every 4 hours in 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 then be replaced.
Signaling
"Normal operation",
i.e. the input voltage at the DC-UPS module is higher than the set cut-in threshold. The loads are being fed by the line-side power supply. If a
battery module is connected, it is fully charged. In normal operation, the green LED (o.k.) is illuminated and relay contact X2.3 – X2.4 (o.k.) closed.
"Floating operation",
i.e. the input voltage is lower than the set cut-in threshold. The loads are being supplied by the battery module. In floating operation, the
yellow LED (Bat) is illuminated and relay contact X2.2 – X2.3 (Bat) closed (de-energized position when unit is disconnected).
Alarm signal "Battery not ready":
closed (de-energized position when unit is disconnected). Causes for the "battery not ready" state in normal operation are as follows: "Off" operating state, no
battery module connected, reversed polarity or defective battery (battery voltage < 18.5V) or open circuit between battery and UPS module. If the signal flashes in a
1.5s cycle, this indicates that the battery is defective, but still capable of floating operation. The specified buffering times cannot be guaranteed in such cases. The
battery module must be replaced.
The "Alarm" signal in floating operation means that the battery voltage has dropped to <20.4V and automatic disconnection to protect the battery is imminent. When
the battery has been disconnected due to overload, short circuit, exhaustive discharge protection or buffering timeout, the red LED (Alarm) goes out, but relay contact
X2.5 – X2.6 remains closed.
Contact rating: 60V DC / 1A or 30V AC / 1A
Interface
: With module type 6EP1931-2EC11, the three signals are output additionally via a PC-capable RS232
interface. They are each displayed in the form of 5 characters of plain text. The assignment is shown in the table on the
right. When the battery is defective, the signal "Battery ready / not ready" is displayed alternately in a 1.5s cycle. A tool
for reading out and processing the signals is available free of charge on the Internet at http://www.ad.siemens.de/sitop.
This website also contains further information about the interface.
Technical specification: 9600 baud, 8 data bits, 1 stop bit, no parity bit, output every 75ms ± 20%, safety separation
according to EN 60950. The connection to the PC is made by means of a continuous 9-way SUB-D extension lead,
(plug/socket), although only 3 pins are needed. (Pin2, Pin3, Pin7)
Environment
Requirements acc. to DIN IEC 721, Part 3-3, Cl. 3K3
Temperature
for storage and shipment:
-40 to +70°C
for operation:
0 to +60°C
Relative air humidity: 75% yearly average, 95% in 30 days, no condensation
(climate model 3K3 acc. to EN 60721)
Weight
6EP1931-2EC01
0.4kg
6EP1931-2EC11
0.45kg
Installation Instructions
In order to guarantee effective cooling, the unit must be vertically installed such that the input and output terminals are at the bottom. A clearance of at least 50 mm
must be left above and below the unit.
Before commencing with the installation or any repair work, switch off the plant main switch and lock it in the "OFF" position. Please read the operating
instructions for SITOP power.
The fuse on the battery module must be removed before any work is carried out.
Connection and Terminal Assignments
Terminals
Function
X1.1
Input voltage DC 24V
X1.3
Output voltage DC 24V
X1.2/X1.4
Input/output voltage DC 0V
X1.5/X1.6
Battery module DC 24V
X2.2,3,4
Signal: Normal operation / Floating operation
X2.5,6,7
Signal: Battery not ready / ready
X2.8/X2.9
On/Off jumper (no jumper =Off)
X3
RS 232 interface
CAUTION
!
The external circuitry of all terminals (including signaling contacts) must meet the safety requirements stipulated by VDE 0805 (EN
60950): SELV.
Siemens AG Österreich
The UPS module is electronically protected against polarity reversal of the input voltage and battery.
The UPS module is protected by the mains fuse (20 A, type FKS) against overcurrent and short circuits in normal
Lead-acid batteries may only be discharged down to a certain voltage (exhaustive discharge threshold). Allowing them to
When the "Battery not ready" signal is active, the red LED (Alarm) is illuminated and relay contact X2.5 – X2.6 (Alarm)
Cable cross-section
1.0 ... 4mm
17...11 AWG
0.5... 2.5mm
20...13 AWG
Standards
Degree of protection: IP20 to EN60529 (VDE 0470 Part1)
Protection class III to EN60950
Safety to VDE 0805 (EN60950): SELV
VDE 0100 Part 410 (IEC 364-4-41)
VDE 0106 Part 1 (IEC 536)
VDE 0113 Part 1 (EN 60204-1)
IEC 1131; CSA C22.2
RI suppression to EN55022, limit-value curve B
Interference immunity to EN 50082-2 incl. Table A2,A3
Cable length
Comments
2
up to 2m
Screw-type terminals for screwdriver with
4.5mm blade width
up to 2.5m
Recommended tightening torque 0.7-0.9Nm
2
up to 3m
Screw-type terminals for screwdriver with
up to 3m
3.5mm blade width
up to 3m
Recommended tightening torque 0.5-0.7Nm
9-way SUB-D connector, 6EP1931-2EC11 only
6 of 8
Signal
Battery ready
Battery not ready
Normal operation
Not normal operation
Not floating operation
Floating operation
SITOP power DC-UPS Module 15
English
Text
BUFRD
ALARM
DC_OK
DC_LO
*****
*BAT*
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