European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com Tel: +44 (0)208 743 8880
Document D154-00-151-IS Issue 8 12-09-2022
Sheet 2 of 3
This is achieved by removing the 4 off M4 cap
head bolts holding on the cover.
Once the screws are removed the cover will hang
down out of the way to gain access to the Ex e
terminal block, the internal earth terminal and
mounting hole recesses.
6)
Earthing
The unit has an internal earth terminal.
It is recommended that a cable crimp lug is used
on the earth wires.
The internal earth wire is placed under an earth
clamp which will stop the cable twisting. This is
secured by an M4 screw and spring washer.
Internal Earth
Ex e terminal block
terminal
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 entries 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 device combination selected.
EOL (End of line) device;
resistor – ExxxR / diode – ED1 / zener – ExxxZ
Series (In line) device;
resistor – SxxxR / diode – SD1 / zener – SxxxZ /
LED
Microswitch 1 = M/S 1
Microswitch 2 = M/S 2
The unit can be wired with a maximum of 2 module
devices – refer to wiring schematic D154-06-051
Voltage
option
Max
Voltage
Min
resistor
value
allowable
in module
Type B
unit
(2.0W)
Min
resistor
value
allowable
in module
Type D
unit
(1.0W)
Min
resistor
value
allowable
in module
Type E
unit
(1.75W)
6 V dc
9 V dc
47 ohms
91 ohms
51 ohms
12V dc
15 V dc
120 ohms
240 ohms
150 ohms
24V dc
28 V dc
470 ohms
820 ohms
510 ohms
48V dc
56 V dc
1K8 ohms
3K3 ohms
2K0 ohms
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
All terminal screws, used or unused, shall be
tightened down to between 0.5 Nm and 0.7 Nm
7.1) Fitted LED, Diode or Zener Diode
If a diode module is pre-fitted as either an EOL or
series device, the following current limitation
applies:
Unit Voltage
Max. Current
48V DC
0.75A
6, 12 & 24V DC
2.0A
If a Zener diode module is pre-fitted as either EOL
or Series device, the following current limitation
applies:
Zener
Voltage
Max. Input
Voltage
Max. Current
3.3V
56V DC
230mA
4.7V
162mA
5.1V
149mA
5.6V
136mA
6.2V
122mA
6.8V
112mA
10V
76mA
12V
63mA
If an LED indicator is pre-fitted (optional on
GNExCP6B Units only), the LED is protected by
the LED current-limiting resistor. See value of this
resistor in table below. This only applies to units
with LED option code ‘L’.
GNExCP6B-PBXXXXXXXXX
L
-XX-ExxxR-SxxxR
LED Resistor
Max. Input Voltage
3K3 (3300Ω)
56V DC
1K5 (1500Ω)
28V DC
In any scenario, the lowest value of maximum
current should be used. For example, if the unit has
both a diode and a Zener diode, the Zener diode
would determine the maximum input current of the
unit, since its max. current is lowest.
8)
Testing unit operation
The push button unit can be tested without the
need to replace any element.
To test, lift the cover lift flap to reveal the push
button. The button should be pressed into the body
to activate the unit and place it into the operated
condition.
The call point switch will now change over its
contacts to operate the alarm.
Once testing is complete the unit needs to be reset
from the operated condition.
Rotate the push button anticlockwise by an angle
of 55°, see guide alignment marks on the button
and cover, shown below (1). The push button
should pop back up to its original position.
Ensure that the push button has also twisted back
clockwise by 55° to its original position see guide
marks on button and cover, shown below (2). The
unit is now reset
1. On operated unit
2. Button should pop
twist push button
up and twist back to
anticlockwise 55°
original position
to reset
