Heavy Duty Assisted Lift Trunnion Operation and Maintenance Manual
Form Reference
C64.65546
Issue
5.00
30 of 39
Issue Date
May 2021
Junction Route Indicator Modules operate at a higher temperature than other
modules. Caution should be exercised when replacing these modules to ensure that
the residual heat has fully dissipated from the alloy heatsink attached to the back of
the modules prior to handling.
Image illustrating the heatsink and short plug coupler connection lead for a PLJI Module
The instructions for lowering and raising the signal should be followed.
Simply unscrew all the captive screws and withdraw the required module sufficiently to
disconnect its plug coupler (which may be in the head or in the connection box depending on
the module type) and remove.
As the signal alignment has not been disturbed, there is no need to carry out a signal sighting
exercise.
Additional Visors
Unipart Dorman iLS signals are designed to be very resistant to sunlight effects such as
washout or phantom, there may be however, a very small number of signals that directly face
East/West that may suffer from the effects of low winter sun. To mitigate these effects Unipart
Dorman has a range of extended visors available.
The fitting kits all come with detailed instructions, which are also available from Unipart Dorman
Lens cleaning of iLS signals with extended visors fitted should be scheduled at an interval
determined by local policy where the signal is being maintained under ROSE. This is because
the lens is no longer directly exposed to the free-falling rain necessary for self-cleaning.
