22
•
When installing systems in parallel, it is necessary to
provide them with a board equipped with individual input
and output protections, as well as a manual bypass with
mechanical locking, see Fig. 18.
This protections board will enable a single device in the
system to be isolated in the event of a fault and the loads
to be powered with the rest during preventive maintenance
or repair. It also allows the removal of a device in parallel
and its replacement or reintegration once repaired without
interrupting the powering of the loads at any time, provided
that the power of the operational device permits it.
Upon request, we can supply a manual bypass board for a
two-device system in parallel.
•
Follow the connection procedure for the input described in
section 5.2.1.
•
Follow the connection procedure for the output (loads)
described in section 5.2.2.
•
Follow the procedure established for the connection of the
battery module or devices with backup extension described
in section 5.2.3.
BATTERY
LINE
BYPASS
FAULT
Input circuit breaker
Output circuit breaker
Manual Bypass
UPS No. 1
Input
To loads
UPS No. 3
BATTERY
LINE
BYPASS
FAULT
Fig. 18.
Parallel installation of two 4 to 10 kVA UPSs with
protections panel and manual bypass.
•
In parallel systems, the length and cross section of
the cables that run from the protections board to
each UPS and from the UPSs to the board will be the same
for all of them without exception.
In the worst case, the following deviations must be strictly
observed:
When the distance between the UPSs in parallel and
the circuit breaker board is less than 20 metres, the
difference in length between the input and output
cables of the device must be less than 20%.
When the distance between the UPSs in parallel and
the circuit breaker board is more than 20 metres, the
difference in length between the input and output
cables of the device must be less than 10%.
5.2.9. Communication port.
5.2.9.1. RS232 and USB port.
•
The communications line -COM- constitutes a very
low voltage safety circuit. To preserve the quality
must be installed separately from other lines carrying
dangerous voltages (power distribution line).
•
The RS232 and USB interfaces are useful for the monitoring
software and updating the firmware.
•
It is not possible to use both the RS232 and USB ports at
the same time.
•
The DB9 connector supplies the RS232 signals and, in
models up to 3 kVA, the normally open (NO) potential-free
contacts using optocouplers.
The maximum voltage and current applicable to these
contacts is 30V DC and 1A.
•
The RS232 port consists of the transmission of serial data
in such a way that a large amount of information can be
sent through a communication cable with only 3 wires.
•
The USB port is compatible with the USB 1.1 protocol for
communication software.
Pin #
Description
Input / Output
1
End of backup
Output
2
TXD for RS232
Output
3
RXD for RS232
Input
4
GND for shutdown
Earth
5
GND for RS232
Earth
6
Common relays
-
7
Shutdown order
Input
8
Low battery
Output
9
Mains fault
Output
Tab. 3.
Pinout of DB9 connector, RS232.
5 1
9 6
2 1
3 4
Fig. 19.
DB9 connectors for RS232 and USB.
5.2.10. Smart slot for the integration of an electronic
communication unit.
•
Optional electronic communication units include:
Interface to relays to terminals, not programmable.
SNMP adapter.
Modbus RS485 adapter.
•
The corresponding documentation is supplied with each
option. Read it before starting installation.
