E2S BExCP3C-BG Instruction Manual page 2

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
Note: Depending on options chosen an 8-Way DIN
Rail or 6-Way terminal block may be selected.
7) Cable connections
There are 3 off cable entry holes suitable for
M20x1.5 Ex e approved cable glands or stopping
plugs with a minimum ingress protection of IP66.
The unit can be wired in a number of different ways
depending on the resistor combination selected.
Refer to wiring schematic D150-06-051 for detail.
EOL (End of line) device:
resistor – ExxxR / diode – ED1 / zener – ExxxZ
Series (In line) device:
resistor – SxxxR / diode – SD1 / zener – SxxxZ
Microswitch 1 = M/S 1
When wiring to Increased Safety terminal
enclosures, you are only permitted to connect one
wire into each way on the terminal block, unless a
pair of wires are crimped into a suitable ferrule.
For the six-way terminal block wire sizes allowable
are 0.5mm² to 4.0mm². For the 8-way DIN rail wire
sizes allowable are 0.5mm² to 2.5mm²
Leads connected to the terminals shall be insulated
for the appropriate voltage and this insulation shall
extend to within 1mm of the metal of the terminal
throat. They shall only be installed and wired with
cable in an ambient temperature of -10°C to
+80°C.
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document D150-00-055-IS Issue 2 11-08-22
All terminal screws, used or unused, shall be
tightened down to between 0.5 Nm and 0.7 Nm.
Voltage Max Min resistor value
option Voltage allowable in module
Type C unit (1.5W)
6 V dc 6 V dc 27 ohms
12V dc 12 V dc 110 ohms
24V dc 24 V dc 430 ohms
48V dc 48 V dc 1K8 ohms
Table 1
7.1) Current Limitations
The maximum allowable current is determined as
the smallest value from the following scenarios:
1. When both module resistor values are the
same as or above the minimum range of
values shown in table 1, the current is not
further limited.
However, when either resistor value is lower
than those shown in table 1, the current must
be limited to the values given in table 2.
Voltage Max Max current when
option Voltage resistor values lower
than minimum
6 V dc 6 V dc 250mA
12V dc 12 V dc 125mA
24V dc 24 V dc 62mA
48V dc 48 V dc 31mA
Table 2
For example, if a 24V DC unit is fitted with a
series resistor of 270 ohms, the maximum
current of the unit would be reduced to 62mA
since the resistance is less than the minimum
430 ohms allowable at this voltage.
E2S recommends a minimum resistor value
of 100 ohms for a Series device and 180
ohms for an EOL device fitted to a 24V unit.
2. If a diode module is pre-fitted as either an
EOL or Series Device, the following current
limitation applies:
Unit Voltage Max. Diode Current
48V DC 0.75A
6, 12 & 24V DC 2.0A
3. If a Zener diode module is pre-fitted as
either EOL or Series device, the following
current limitation applies:
Zener Max. Input Max. Current
Voltage Voltage
3.3V 230mA
4.7V 162mA
5.1V 149mA
5.6V 136mA
56V DC
6.2V 122mA
6.8V 112mA
10V 76mA
12V 63mA
8) Testing unit operation
The break Glass unit can be tested without the
need to break/replace the frangible glass
element.
A test 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 change over its
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.
Sheet 2 of 3
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 break glass unit has been operated the
broken glass element can be quickly replaced.
The break glass 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.
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