Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Settable buffer time by DIP switches in the range between 5 to 315 sec. or
up to enforced shutdown by deep discharging.
In case of increased load current requirements (e.g. when connecting incan-
descent lamps, contactor relays with DC autotransformer winding, DC mo-
tors, DC/DC converters, electronic modules with high input capacity), high,
electronically limited peak currents are delivered automatically.
After a power failure, the battery module is automatically electronically dis-
connected from the loads and quickly recharged with a constant current of
0.7A (U/I characteristic with 27V end-of-charge voltage).
Exhaustive discharge protection
ON/OFF control circuit
LED green/LED yellow and floating changer for mains/battery operation
LED red and floating changer for readiness for backup existing (LED OFF)/
alarm (LED ON).
RS-232 interface (serial interface) for the additional output of all signals to a
The connection from the SITOP POWER DC-UPS module 15 to the serial inter-
face of the PC is made using a 9-pin SUB-D interconnecting cable:
Design connector/socket connector
The individual cables are connected 1:1 to the appropriate pins.
Pin assignment of the 9-pin SUB-D connectors
2 Hardware Descriptions
2.11 Uninterruptible power supply (UPS)
Negative supply voltage
Positive supply voltage