Page 447 - IRSEM_Main Book

19.4.4 Spring Setting Device (SSD)

SSD of approved type shall be provided at junction of Rail head (JOH) to
assist in proper setting of switch up to junction of Rail head (JOH).

(a) SSD is placed between sleeper number 13 and 14.

(b) SSD is insulated from both the rails.

(c) SSD installation and maintenance is responsibility of Engineering
Department.

19.4.5 Ground connection and clamp lock for Thick web switches shall be installed as
per concerned RDSO drawings/approved drawings and installation guidelines.

19.4.6 Obstruction Test

The detector slides, lock slides and drive rod must be so adjusted with 5 mm
thick test piece placed between the switch and gauge face of stock rail at 150
mm from the toe of the point. The following to be observed:

(a) Friction clutch de-clutches the motor from mechanism.

(b) The point can not get locked either by clamp lock or by locking segment
inside the point machine.

(c) Lock segment does not enter into the notches of locking slides.

(d) Switch detection contacts do not make.

(e) The slipping current is not exceeding twice of the normal working current.

19.4.7 Insulation Test

(a) Point machine: Check that point machine is insulated from ground
connection.

(b) Spring setting device: Insulated from both the rails.

(c) Clamp lock assembly: Check that it is insulated from both the rails.

Chapter 19: Installation, Testing & Maintenance of Signalling Equipment Page 395 of 535