2.13
Date Code 20060320 Instruction Manual SEL-311C Relay
Installation
Making Rear-Panel Connections
Standard Output Contacts
Model 0311C01x part numbers with a numeral “2” in the field (bold below)
(sample part numbers) indicate standard output contacts on the extra I/O board
(OUT201 through OUT212):
0311C01H2425421
Standard output contacts are not polarity dependent.
High-Current Interrupting Output Contacts
Model 0311C01x part numbers with a numeral “6” in the field (bold below)
(sample part numbers) indicate high-current interrupting output contacts on
the extra I/O board (OUT201 through OUT212):
0311C01H2425461
High-current interrupting output contacts are polarity dependent. The extra
I/O board of the Model 0311C01x relay in Figure 2.8 does not show “+”
polarity markings (because it is the rear panel for an extra I/O board with
standard output contacts).
As an example, consider the connection of terminals B01 and B02 (high-current
interrupting output contact OUT201) in a circuit. Terminal B02 (+) has to be at a
higher voltage potential than terminal B01 in the circuit.
The same holds true for output contacts OUT202 through OUT212 (if they are
also high-current interrupting output contacts).
Fast Hybrid High-Current Interrupting Output Contacts
Model 0311C01x part numbers with a numeral “5” in the field (bold below)
(sample part numbers) indicate fast hybrid high-current interrupting output
contacts on the extra I/O board (OUT201 through OUT208):
0311C01H2425451
Fast hybrid high-current interrupting output contacts are not polarity
dependent and may be used to switch either ac or dc loads.
Short transient inrush current may flow when a switch that is in series with the
contact is closed, and the contact is open. This transient will not energize the
circuit used in typical applications. Trip and close coils and standard auxiliary
relays will not pick up; however, an extremely sensitive digital input or light-
duty, high-speed auxiliary may pick up for this condition. The transient occurs
when the capacitance of the output contact circuitry charged. A third terminal
(B03 in Figure 2.9) provides a path for charging the capacitance when the
circuit is open.
Figure 2.12 shows some possible connections for this third terminal that will
eliminate the possibility of transients when closing a switch. Circuit load is
not shown. In general, the third terminal must be connected to the dc rail that
is on the same side as the open switch condition. If an open switch may exist
on either side of the output contact, only one condition may be considered.
Two open switches (one on each side of the contact) defeat the charge circuit.
!
CAUTION
Do not use the high-current
interrupting output contacts to switch
ac control signals.
!
CAUTION
Carefully note the relay terminal
polarity designations before wiring
high-current interrupting output
contacts.
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