gazex W1 Series Information Card

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BEFORE installation, read the full documentation regarding the device
available at www.gazex.pl or at the address in the code QR →
The device information card does not contain all the information necessary
for proper and safe installation of the system. The installation should be
entrusted to a qualified specialist.
Recommended sequence of action during installation:
1. Read the full content of the user manual.
2. Define the group of detector addresses whose alarm states will activate the MDD-S2 outputs
(Table 2, col. 3). The groups of detector addresses are factory-assigned to specific numbers of
executing devices.
3. Using the SLAVE ID switches, assign the MDD-S2 module the number of the executing device that
is assigned to the group of detector addresses.
4. Connect MDD-S2 to the system consisting of MDD-256/T and detectors according to Fig. 1, switch
on the power supply.
5. In MDD-256/T, switch on the operation of the executive device with the number that was assigned
to MDD-S2 (p. 3).
6. Perform an operation test of all devices according to the appropriate operating instructions
The MDD-S2 digital module is the executive element of the GAZEX Digital Gas Detection System
(DGDS). The MDD-S2 converts alarm signals from detectors into executive signals (one MDD-S2
module supports a maximum of 32 detectors). MDD-S2 is assigned to a group of detectors if, in
this group, at least one detector is in alarm state A1 or A2, then 12V voltage will appear on the
appropriate MDD-S2 output (A1 or A2 and A1), to power optical or acoustic alarms. MDD-S2
allows for the installation of alarms in a place distant from detectors without the need for
additional power supply. The function of the control unit in DGDS is fulfilled by the MDD-256/T
module, it can support a maximum of 224 detectors (with addresses A001-A224) and a maximum
of 21 executive devices (with addresses d.o.0.1-d.o.0.7, d.o.1.1-d.o.1.7, d.o.2.1-d.o.2.7).
Power supply and digital communication can be supplied to MDD-S2 with one main cable –
shielded, 3 twisted pairs, with a core cross-section of 0.5 mm
Tab.1. Technical parameters of MDD-S2
Supply voltage
Power
consumption
Outputs
Digital port
Optical indication of
module status
Optical signaling of
output status
KIU - Device Information Card of MDD-S2
24 VDC (15.0 ÷ 30.0V)
20 mA@24V (no signaling devices);
max 150m A@24V (at max load of alarm outputs)
A1, A2; 12VDC, load Σ max 0,2 A;
for connecting optical and acoustic signaling devices type SL..., S-3x,
LD-2 or TP-4.As
RS-485, MODBUS RTU protocol, galvanically isolated, 9600 bps;
SLAVE address selection by switch;
bus terminator switch
LED, 3 pcs, see Table 3
LED, 2 pcs, one for each exit, see Table 4
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KIU - DEVICE INFORMATION CARD
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