European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com Tel: +44 (0)208 743 8880
Document D154-00-155-IS Issue 8 12-09-2022
Sheet 2 of 3
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
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
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.
Voltage
option
Max
Voltage
Min resistor value
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
option
Max
Voltage
Max current when
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
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
4.
Units with LED code ‘C’
GNExCP6C-PBXXXXXXXXX
C
-XX-ExxxR-SxxxR
Maximum current is
reduced to 20mA.
In
this case, the current-limiting resistor for the
LED is not present, so that to safely power
the LED the maximum current must be
limited.
For units with LED code ‘L’, the current is
limited by the LED current-limiting resistor.
See value of this resistor in table below.
GNExCP6C-PBXXXXXXXXX
L
-XX-ExxxR-SxxxR
LED Resistor
Max. Input Voltage
3K3 (3300 ohms)
56V DC
1K5 (1500 ohms)
28V DC
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.
