User Guide

3RT1 contactors/ 3RH1 control relays
SIRIUS System Manual
3-24 GWA 4NEB 430 0999-02 DS 01
Warning signals The warnings are sent either using a free floating relay contact or using the
integrated AS-Interface connection. Once 20 % of the remaining lifetime is
reached, which means that 80 % of the contact material is worn and the
changing of the main contacts should be planned.
Resetting the remaining lifetime indicator RLT
Advantages of Remain-
ing lifetime indication
RLT
• Timely notification for the switching of the main contacts
• Optimal use of the contact material
• Makes visual inspection of the contacts unnecessary
• Reduces the maintenance costs
• Optimizes planning for maintenance steps
• Avoids unforeseen system shutdown
Notes for the use of contactors with remaining lifetime indication RLT
Use in rotor circuits by
wound-rotor motor
A typical measuring parameter of the RLT function is the voltage over the
main contacts of the contactor when breaking (turning off the contactor).
However, voltage levels in rotor circuits can vary depending on slip, so that
they not suitable for evaluation and could lead to premature warning of the
RLT.
The various erosion levels are shown
using LEDs on the contactors’ side
mounted electronic module:
60 % of the remaining lifetime (green LED)
40 % (orange)
20 % (red)
100%
60%
40%
20%
RLT
60%
40%
20%
RLT
60%
40%
20%
RLT
60%
40%
20%
RLT
60%
40%
20%
When resetting the remaining lifetime
indicator after changing the main con-
tacts the following needs to be consid-
ered:
• The control voltage must be applied
to A1/A2 (1) and the contactor must
be off.
• Press the RESET-button on the side
mounted electronic module with a
ball point pen or something similar for
about 2 sec. (2) until the green LED
"RLT" is the only one lit (3)
= Reset complete (4)
2
RESET: 2s min
A1/A2
ON
1
RLT
60%
40%
20%
3
RLT
60%
40%
20%
RESET O.K.
4