Carel GDWB, User Manual

Page: 34 / 52

10
ENG
+0300046IE - rel. 1.2 - 14.01.2021
2.3 Mechanical installation
1.
Using the hardware supplied, securely mount the detector in the
location identified using a manual or power screwdriver.
2.
Using a 4 mm hex/Allen key (NOT INCLUDED), unscrew the fixing
screws and remove the cover, disconnecting the ribbon cable from
the base on the built-in version or from the detector head on the
remote version.
3. Place the cover and rubber gasket to one side. These will need to be
reassembled following electrical installation.
To refit the cover, follow the same procedure in reverse.
CAUTION : when reconnecting the ribbon cable between the main
board and the sensitive element, DO NOT INVERT the connector. Refer to
the following image, making sure the markings are aligned (plastic catch).
2.4 Electrical installation
Before commencing electrical installation and wiring, carefully read the
following notes.
•
Power must be supplied by a safety isolation transformer (Class 2) with
no earth connection on the secondary winding.
•
The cable for the relays must be sized and fitted with fuses based on
the rated voltages, currents and environmental conditions.
•
If stranded wires are used, an end terminal is required
•
To comply with RFI immunity regulations, the communication cable
shield on BOSS, mini-BOSS or other supervisors must be earthed (e.g.
to the chassis, earth bar, etc.)
•
Complete all wiring before powering on.
IMPORTANT : this product uses semiconductors
that may be damaged by electrostatic discharges (ESD).
When handling printed circuit boards, observe proper
ESD precautions so as to not damage the electronics.
IMPORTANT : do not power the gas detector from Carel controllers
or other third-party devices, due to the peak current draw of 1.5 A.
CAUTION : the power supply must be suitably rated to power the
device (e.g. 19.5 to 28.5 Vdc or 24 Vac). This determines how far the device
can be mounted from the controller or from the power supply.
2.4.1 Power and signal wiring
The product is supplied with pre-installed cable glands and caps. The
power input cable gland is supplied without the sealing cap fitted. Use
the cable glands provided to pass through and connect the cables to
the terminals, as shown in the figure and in the connection table below.
The terminals can be removed to simplify wiring.
The polarity must not be reversed.
For installations with a daisy-chain configuration, the type of voltage
returned to the 24 V OUT pins is the same as the voltage used to power
the device at the 24 V IN pin.
IMPORTANT : the manufacturer requires a bump test or calibration
to be performed after installation to verify that the device is functioning
correctly. See “Calibration and bump test” for more details.
Connection Description of the connection Label Description of the terminal
Power supply 24 V DC/V AC IN 24 V IN: - V AC neutral / V DC earth
24 V IN: + V AC phase / +24 V DC
24 V DC/V AC OUT 24 V OUT: - V AC neutral / V DC earth
24 V OUT: + V AC phase / +24 V DC
Serial output Modbus network communication MODBUS: B RS485 “B” (inverting, -, Rx)
MODBUS: A RS485 “A” (non-inverting, +, Tx)
MODBUS: GND RS485 GND
MODBUS: SH RS485 shield
Analogue output Voltage or current output ANALOGUE: - Analogue output reference (-)
ANALOGUE: + Analogue output signal (+)
Tab. 2.b
2.4.2 Remote detector head installation (GDWR only)
To connect the remote detector head and main unit on GDWR* model
gas detectors (remote version), a standard RJ45 Cat 5E STP cable, 5 metres
long, is supplied (included with the product). The connector used is
model 8P8C, with the following dimensions: 12 x 43 x 8 mm ±1 mm.
IMPORTANT : NON-STANDARD cables up to 5 metres long can
be used. In this case, to meet product EMC requirements, equivalent or
better shielding quality than the cable supplied must be provided. DO
NOT use cables that are more than 5 metres long.
To proceed with installation, follow the steps shown below (for both the
main device and the remote detector head):
1. Remove the cable gland and the cap from the M20 cable gland on
the bottom of the device and carefully remove the rubber gasket
from the cable gland. The rubber gasket is split to allow it to be fitted
around the RJ45 cable.
2.
Place the nut on the cable, through the 8P8C connector.
3.
Place the rubber gasket on the cable between the cable gland nut
and the end of the cable.
4. Slide the 8P8C connector through the cable gland and into the
plastic enclosure, making sure not to damage the printed circuit.
5.
Plug the RJ45 connector into the RJ45 female socket on the board.
Plug the RJ45 connector in carefully, as the cable needs to bend, and
excessive tension may damage the printed circuit board.
6.
Refit the cable gland by sliding the rubber gasket into the cable
gland opening and tightening the nut. Make sure that the RJ45 cable
does not bend or stress the printed circuit board terminal blocks (do
not leave excess cable inside the enclosure).
2.4.3 Application examples
IMPORTANT : always check compatibility with the application on
the controller.