GE IRT51 E, Инструкция по эксплуатации, Страница: 12 / 51

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The RTD assembly fu rnished as part of the I RT5 1 H relays is shown in Fig u re 4. The
RTD probe is tip sensitive; therefo re, the probe tip must come in direct contact with
the material whose temperatu re is to be sensed. The temperatu re pro be is not spring
loaded; therefore, its primary application is fo r sensing the temperature of fluids.
The one-ha 1f to th ree-eighths inch brass reducing b ushing pi pe fitting shown in
the RTD assembly ( Figu re 4) is fu rnished as part of the RTD assembly. It is not
necessary to use this fitting when applying the RTD assembly to new equipment. The
primary reason this fitting is fu rnished is to readily adapt the RTD assembly to
applications which already have a temperatu re sensing element installed. This
fitting will adapt the RTD assembly to take the place of the syl phon tube, bulb and
packing gland of the Gene ral Electric Company temperatu re relay type TBB.
OPERAT I NG UNIT VOLTAGE CONNE CTIONS
The I RT 5 1 relays may be used with an o perating voltage of 1 1 0/1 20 volts A C o r
2 20/240 volts A C a t frequencies o f 5 0 o r 6 0 hertz. A simple change in the wiring
scheme to the o pe rating unit is required to o pe rate at either of the two different
voltage levels. When the relay is shipped f rom the factory, it is set for 220/240
VA C o pe ration. Refer to the external connections diagrams shown in Fig ures 1 0, 1 1
and 1 2 for the connections to be used for diffe rent voltage sou rces.
See Table 1 fo r the relay voltage ratings.
1 20 volt A C Ope ration: Coil H 1-H2 must be placed in pa rallel with coil H3-H4.
To make the parallel connection, connect lead H 1 to lead H3, and lead H2 to lead H4.
Pola rity is impo rtant.
240 volt A C O pe ration: Coil H 1-H2 must be placed in se ries with coil H 3-H4.
To make this connection, connect lead H2 to H3. P olarity is im po rtant.
The IRT5 1E and I RT5 1 F models have an internal insula ted stand off post at
terminal SA to assist in making the series connection for 240 volt A C o peration.
The IRT5 1 G and IRT 5 1 H models have the coil leads brought to individual terminals;
therefo re, the terminal c onnections must be made exte rnal to the relay.
AUXILIARY CIRCUIT CONNECTIONS
IRT5 1E:
For trip circuits o pe rating on cu rrents ranging from 0.2 to 2.0 amps DC at the
minimum control voltage, set the target and seal-in tap sc rew in the 0.2 amp tap.
For trip circuits o perating on cu rrents ranging from 2 to 30 am ps D C at the minimum
control voltage, place the tap sc rew in the 2.0 amp tap.
The tap screw is the screw holding the right stationary contact of the target
seal-in unit. To change tap settings, it is im po rtant that the stationa ry contact
positions not be distu rbed. A tap changing procedu re that will prevent the
stationary contacts from getting o ut of adjustment is as follows:
1. Remove the connection plug.
2.
Remove one of the screws in the left stationary contact and place it in
the desired tap.
1 1
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