Page 12 - Wagp_InterfaceElectronic_Volume4_2015_US.pdf

0 WAGO Relay Modules

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WAGO Relay Modules. Definitions of several AC versions of select relays equipped
The professional interface important technical terms with series connected rectifiers
between electronics and peripheral (refer to the wiring diagrams) can be
equipment. Coil-side information triggered with AC and DC at the stated
Even in modern automation systems, The relays can be used within the stated nominal voltage.
electromechanical relays guarantee temperature range with nominal voltage
a safe connection between process plus tolerance at 100% contin uous duty The free-wheel function is in this case
control systems and process and rating. actuated by the rectifier.
signalling systems. They provide: According to the type and application, In order to guarantee a safe operation it
• a high isolation level between input the relays are triggered with DC or AC has to be observed that “residual volta-
and output circuit signal. ges” due to cable capacitance in case of
• ability to match different signal levels The DC versions (residual ripple ≤6%) long connecting lines or leakage currents
are, unless otherwise stated, equipped of semi-conductor switches and their pro-
• signal amplification and/or signal with LED function indicators, a recovery tection circuits are lower than the release
multiplication, especially for different diode and a reverse voltage protection voltage of the relay.
potentials in the input and output diode.
circuits.
For DC relays, the release voltage is spe-
Modernized relays also offer cified with a value of ≤5% of the nominal
the following advantages:
voltage;
• unaffected by electromagnetic fields for AC relays it is 15% of the nominal
and surges voltage (acc. to VDE 0435).
• high short-term overload capacity for If a high residual voltage exists, it is
the input and output sides possible that the relay will not reset.
• small switching power losses
Addition of a parallel connection of an
• a module for switching of AC or DC For a nominal voltage of ≤12VDC,
the LED is connected in parallel to the coil. RC element of:
R = 100-220Ω
WAGO AUTOMATION offers a C = 220-470nF
complete range of relay modules that could remedy this situation.
provide these functions for a wide range
of applications.
Depending on the function and
operating conditions, the relay modules
are available with different contacts, con- For a nominal voltage ≥24VDC,
tact materials, housings and shapes. the LED isconnected in series with the coil.
The following relay types are also
available: bistable switching relays, time-
delay relays, current pulse switching and
safety relays with force-guided contacts.
Alternatively, the 286-904 relay
module is available.
This specially developed module
features a defined release point at
110VAC ± 10% at an operating
voltage (coil volt age) of 230 VAC.