E2S IS-CP4B-BG Instruction Manual page 2

6) Earthing
The unit has both internal and external earth
terminals.
It is recommended that a cable crimp lug is used
on the earth wires.
The internal earth wire is placed under a earth
clamp which will stop the cable twisting. This is
secured by an M4 screw and spring washer.
The external earth lug should be located between
the two M5 washers provided and securely locked
down with the M5 spring washer and two locknuts.
Internal Earth
terminal External
Earth Stud
Ex e terminal block
7) Cable connections
There are 3 off cable entries for M20x1.5 cable
glands or stopping plugs.
Cable glands or stopping plugs must be rated IP66.
The unit can be wired in a number of different ways
depending on the resistor combination selected.
Option 1 – EOL (End of line) Resistor
Option 2 – Series (In line) resistor
Option 3 – Series and EOL resistors
The equipment needs to be installed with ATEX
and/or IECEx certified Zener Barriers or Galvanic
Isolators.
For wiring schematic refer to drawing D150-06-051
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document D150-00-551-IS Issue 4 11-08-2022
8) Testing unit operation
The breakglass unit can be tested without the need
to break/replace the frangible glass element.
A test key (7mm Allen key) is used to mechanically
drop the glass down activating the switch.
The test key is inserted in the test cam and rotated
clockwise by an angle of 60º the glass element will
visibly drop down in the viewable window.
The call point switch will now changeover it's
contacts to operate the alarm.
Once testing is complete the unit needs to be
reset, the test key is rotated back anticlockwise by
an angle of 60º back to its original position. The
glass element should now raise up so it is level
again in the viewable window.
1. 2. 3.
Insert test Hold in Rotate back
Key rotate position anticlockwise
clockwise during to reset
60º test
9) Replacement of glass element
If the breakglass unit has been operated the
broken glass element can be quickly replaced.
The breakglass cover plate is removed by
unscrewing the 4 off M4 cap head screws attaching
it.
Once cover is removed the broken glass will be
free to be removed, clean out any other fragments
of glass carefully.
To fit the new glass element rotate the top cam
clockwise by an angle of 50º (use a 6mm Allen
key) this will than allow the glass to fit back into the
pocket it sits in, resting on the pivot point and test
cam, release the top cam to rest on the top of the
glass element.
Pivot point Test Cam Top Cam (rotate)
Replace the cover plate and tighten the 4 off M4
cap head screws.
Ensure the glass element is free to move under the
cover plate. This can be done by running through
the units test operation. See section 8 of this
instruction manual.
Sheet 2 of 2
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