Conditions for a trouble-free network of several drives
Mains connection
12
Network of several drives
12.4
12.4.2
L
12.4-3
EDS82EV903-1.0-11/2002
Use central mains contactor (¶ 12.7-2)
Decentralised switching of the mains supply is possible if the single mains
contactors are monitored when switching on (feedback to PLC) and the
connection of the contactors follows the same cycle.
A 1 A 2 A n
F 4 , F 5
F 1 . . . F 3
A C
M M M
K 1
D C
K 2 K n
S P S
K 1
K 2
K n
K 2
K 1 K 2 K n
Fig. 12.4-1 Decentralised switching of the mains supply in network operation
A1 ... An Controller 1 ... controller n
F1 ... F3 Mains fuses
F4 ... F5 DC fuses
K1 ... Kn Mains contactors
C0173 must be set to the same value for all 93XX controllers connected to the
network.
The mains supply for each controller must be monitored, because it is possible
that all mains input circuits still active in the network may be overloaded when the
mains fails.
)
))
) Note!
Switch off the entire network if the mains supply or mains phase
fails.
(¶ 12.7-2)
Use switching elements for mains failure detection and warning:
l Thermal overcurrent releases (bimetal relay) connected after
the mains fuses
l Cableprotectionthroughpowerswitchwiththermaland
magnetic releases and with integrated alarm contact
If additional capacities are connected to the DC bus, the input rectifier of the
controllers or the 934X supply unit can be overloaded.
Therefore ensure appropriate resistors.
Switch-on conditions
Adaptation to the mains voltage
Mains failure detection with
decentralised supply
Additional capacities in the
DC-bus