User Guide

3RT1 contactors/ 3RH1 control relays
SIRIUS System Manual
3-16 GWA 4NEB 430 0999-02 DS 01
3.2.2.2 The electronic coil, in general
The magnetic coil is supplied with the power necessary for reliable switch-
ing and holding by internal series-connected control electronics.
Emergency-Stop Attention
The control of the coil with a semi-conductor element, the control inputs
(PLC, AS-Interface), may not be used for Emergency-Stop purposes.
For Emergency-Stop the contactor must be turned off over A1/A2 terminals
Control voltage Compared to the conventional coil, the electronic coil covers an even wider
range of globally available control voltages within a single coil variation, for
example UC 200-208-220-230-240-254-277 V.
Extended coil voltage
tolerance 0.7 – 1.25×U
s
When you take the coil voltage tolerance of 0.8×U
s min –
1. 1 × U
s max
into
consideration along with the wide rated voltage range of the electronic coil
you’ll find that the most common control voltages of 24, 110, 230 and 240 V
have an extended coil voltage tolerance of at least 0.7 – 1.25×U
s
in which
the contactor will function properly.
Defined pick-up
voltage and drop-out
voltage thresholds
The control electronics monitor the incoming control voltage to an allowable
lower limit value with which the contactor can reliably function.
• The coil picks-up at a control voltage ≥ 0.8×U
s min
• The coil drops-out at a control voltage ≤ 0.5×U
s min
With the Hysteresis in the switching threshold, chattering of the main con-
tacts is avoided and thereby also avoiding increased wear or welding when
in operation with weak, instable power networks.
The pick-up voltage threshold prevents coil burn out when someone applies
too low of a control voltage to the coil, such as can happen with a conven-
tional coil.
Short term bridging
during voltage dips
The loss of control voltage to the coil (0 V on A1/A2) is bridged up to about
25 ms which prevents unwanted coil drop-out.
Electromagnetic com-
patibility (EMC)
The contactors with electronic coils meet the necessary requirements with
regards to noise immunity/ emitted interference for the use in industrial
applications:.
Table 3-8: Electromagnetic compatibility
Planning note
When in operation in or around converter power circuits, it should be noted
that the control wiring to the contactor should be installed separately from
the load side wiring of the converter.
Noise immunity Burst IEC 61 000-4-4 4 kV
Surge IEC 61 000-4-5 4 kV
Electrostatic discharge, ESD IEC 61 000-4-2 8/15 kV
Electromagnetic field IEC 61 000-4-3 10 V/m
Emitted interference Limiting value EN 55 011 A