NEWTON+ – Operational Manual
TRINITY
[19]
Control Outputs
The relays are protected by snubbers against fast voltage transients which occur
when inductive loads are switched off and therefore, the following points should be
taken care when using these relay contacts:
Use 230V AC coils only in the contactors. DO NOT use 440V AC coils.
DO NOT switch small loads like electronic Hooters, small relays with 240V AC
coils etc., directly from the relay contact of NEWTON+. If done so, the small
leakage current from the snubbers will not allow these loads to be switched off
fully. The electronic hooters thus will give a low hum continuously, and the small
relays will switch on but not switch off.
Use these relay contacts to switch an Auxiliary contactor and put the load on the
contactor contacts.
For correct operation, various points in the system need attention and unless these
are correctly set up, proper operation cannot be expected.
These points are noted in section (A) and (B) such as subsequent sections deal with
operational checks, setting up and trouble shooting.
(A) Trouble Shooting
The NEWTON+ is robust electronic equipment and must be handled with all the care
merited by it. It is quite rugged and will withstand a few hard knocks, but this cannot
make up for the deficiency in system design.
Repairs at site are not recommended because at most this can only be a patch work,
and sustained reliability is difficult to achieve with a site repaired Relay. This section
on Troubleshooting therefore deals with fault finding in the system and to establish
whether the Relay is defective or whether it is a system problem. If the fault is seen
to lie entirely with the Relay, it will have to be sent to factory for repairs.
System faults can be classified into three categories:
Those related to the basic configuration of the system.
Those related to the errors and mistakes in the implementation of the system
design.
Those related to the faults in the actual equipment.
a. Faults related to the actual system design:
The most common faults are:
External Manual Control not implemented properly
Here many designers provide a ‘Starter-relay’ configuration for the manual control,
and just bring the connection from the relay contact to the contactor.
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