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1.
The
temperatu re , causing the right-hand contact (I RT R ) to close , and
2 .
The relay i s reset by any one of the three method s listed below:.
METHOD 1:
Reset can be accompli shed by pushing u pward on the reset rod
bottom , left side of the relay cover.
METHOD 2:
Reset can be accomplished electrically f rom a remote location by connectin g a
switch across terminals 1 9 and 20.
reset; however , the target of the target seal-in unit will still show if the
target seal-in unit had o perated.
is by manually pushing u pward on the reset rod located at the bottom , left side
of the relay cover.
MET HOD 3:
The relay can be made to be self- resetting by shorting terminal s 19 and 20
to gether.
seal-in unit will still show if the tar get seal-in unit had o pe rated. The only
way to remove the target indication is by manually p ushing u pwa rd on the reset
rod located at the bottom , left side of the relay cove r.
The IRT5 1 G and IRT51H auxiliary circuits have a special inte rlock arran gement
that will maintain the last ener gized position of the contacts.
be maintained even if power is removed from the relay.
considered when fi rst placing the relay into service or when retu rning a relay back
into service after com pletin g maintenance on the relay.
up for reasons other than overtemperatu re:
1.
Ap ply powe r to the IRT relay
2 .
Reset the I RT relay manually
3 .
Energize the equi pment which is to be protected.
This will ensu re that the relay contacts and target seal-in unit are in the correct
state for ove rtem peratu re protection.
, �
RTD CONNECTIONS
Each of the IRT relays has been designed to be used with a specific type
resistance temperature detector.
1
that the re
ay is suitable for use with the RT D.
the relay name plate , and in Table 1 of this instruction book.
The RT Ds to be used with IRT relays should be a three wi re type.
coming from the RTDs sho uld be shielded to prevent stray fields from inducing
voltages into the RTD ci rcuit.
extension leads should be twisted to gether.
relay
senses
a
temperatu re
If this method of resetting is chosen , the tar get of the tar get
If an extension to the RT D len gth is required, the
GEK-86038
at
or
below
When the switch is closed , the relay will
The only way to remove the tar get indication
Befo re connecting an RTD to the relay , make sure
This information is presented on
Also , the lead extension resistance
1 3
the
pre- selected
1
ocated at the
This position will
This s pecial featu re must be
To avoid t ri p ping on start
The leads
reset
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