Page 455 - IRSEM_Main Book

(g) Point Controlling Circuits

(i) Each point shall be set to reverse position by operating the controlling
lever/switch/buttons. After the point has been fully reversed, each track
circuit controlling the point shall be individually shunted in turn and
operation of points to normal position shall be attempted. It shall not be
possible to operate the point under these conditions. These tests shall
be repeated with the point set in normal position, attempt being made
to operate it to the reverse position.

(ii) With the obstruction in the points, the point shall be operated from
normal to reverse and reverse to normal and it shall be checked that
the over-load relay where provided gets energised and the feed to the
motor is cut off immediately. Where over load relay is not provided, the
feed to the motor shall be cut off after the lapse of a prescribed time.

(iii) The out of correspondence test shall be carried out by opening cut out
contact of one end of point machine and the point lever/knob/button
operated. The other end of the point may operate but the point
indication relay shall not energise.

(h) Point Indication Circuit

(i) The point shall be operated from normal to reverse and reverse to
normal and the position of point detection relay as well as the indication
of the point in the cabin/panel shall be checked for correspondence
with the position of the points at site. It shall also be checked that with
the obstruction in the point, the detection relay is de-energised and
both normal and reverse point indication in the cabin/panel are
extinguished in case of electromechanical signal and flash in case of
PI/RRI installations.

(ii) The operation of the detection relay to the correct position as well as its
de-energisation should be checked by making and breaking the
relevant point detector contacts at site.

(i) Crank Handle Interlocking

It shall be checked that when the crank handle is removed from its normal
position in Electric Key Transmitter/other approved Relay interlocking
arrangement, the signals reading over the concerned route/zone can not be
taken 'OFF' nor the points can be operated from the cabin/panel. It shall also
be checked that when the signal reading over the concerned route/zone is
taken 'OFF', the crank handle can not be released from its normal position in
Electric Key Transmitter/other approved Relay interlocking arrangement.

Chapter 19: Installation, Testing & Maintenance of Signalling Equipment Page 403 of 535