User Guide

3RT1 contactors/3RH1 control relays
SIRIUS System Manual
3-48 GWA 4NEB 430 0999-02 DS 01
3RH14 latched
auxiliary contactors
If there is a short circuit in the low-voltage network, or when large drive
motors are switched on directly, the control supply voltage for the auxiliary
contactors may fail briefly or fall below the permissible tolerance level. To
ensure continuous operation, the variant with mechanical latching (3RH14)
can be used with the auxiliary contactors.
These auxiliary contactors latch mechanically after power-up and remain in
an energized state even in the event of a power failure. The auxiliary contac-
tor can be unlocked electrically using an interlock release magnet or manu-
ally using a button on the front of the attached latched block. When the volt-
age returns, the production program can be resumed immediately without
resetting times due to the storage feature of the auxiliary contactors. The
contactor coil and the coil of the release magnet are both designed for con-
tinuous operation.
The power input is the same for the contactor coil and the release coil. The
mechanical service life is 1 million operating cycles.
3.3.8 3RT10 contactor relays for switching motors (interface) and 3RH11 control relays for switching
auxiliary circuits
Contactor relays are available in the SIRIUS modular system for switching
motors and auxiliary circuits for the purpose of smooth interaction with elec-
tronic controllers. These are variants of the 3RT10/3RH11 contactor series
with the following features:
• Low power input
• Wide operating range of the magnet coil 0.7 to 1.25 x U
s
• High contact reliability of the auxiliary contacts
• Integrated or attachable overvoltage damping
Contact reliability The high contact reliability of the auxiliary contacts ensures that false sig-
nals do not occur even at low switching capacities. With a voltage of 17 V
and a current of 1 mA, there is on average less than one contact fault per
100 million switching operations.
Overvoltage damping Overvoltage damping protects sensitive output levels of electronic control-
lers against switching overvoltages of the coil.
Extended operating
range
The operating range of the coil of the contactor relays covers a voltage
range from 0.7 to 1.25 x U
s
(U
s
= rated control supply voltage). This wide
operating range is required for the supply voltage of electronic controllers
with the required voltage tolerances.
The supply voltage of electronic controllers with 24 VDC covers the range
20.4 V to 28.8 V in acc. with DIN 19 240. If you take into consideration an
additional loss of voltage of up to 3 V during the output phases, the contac-
tor drive must be able to operate perfectly with voltages between 17.4 V and
28.8 V. The 3RT10 and 3RH11 contactor relays for electronic controllers
operate safely from 17 V to 30 V, which corresponds to a voltage range of
0.7 x U
s
to 1.25 x Us. This is a considerably wider operating range than that
of 0.85 to 1.1 x U
s
for contactors and auxiliary contactors in acc. with
IEC 60 947, DIN EN 60 947 (VDE 0660).