VESDA by Xtralis
VESDA VLC-EX Product Guide
www.xtralis.com
19
6
Wiring Connections
6.1
Termination Card
The Termination Card acts as the interface for VESDAnet (VN Model), VESDA Link (RO Model), power
supply terminals, relay and relay terminals.
Since the VLC-EX is designed to be applied in an environment where there is potentially a hazardous
atmosphere, it is important that all users are aware of and follow the guidance given in the appropriate
standards, including in: EN 60079-17:2007, “Explosive atmospheres. Electrical installations inspection and
maintenance” and that they also adhere to the specific rules and regulations for the site where the product is
deployed.
This requires that the product be used with cable glands which are rated for the environment and are sized
correctly for the cables to be used to connect the unit. Care must be taken to terminate and restrain the field
wiring, such that it cannot be pulled out of the cable gland or the terminal strip.
Notes:
l
All unused cable entries, i.e. those without a cable/cable gland, must be fitted with a suitable blanking
plug in order to maintain the case seal.
l
The screw terminal blocks on the termination card are designed to accept conductors in the range 0.2–
2.5 sq mm (30–12 AWG). In accordance with EN 60079-15:2011, clause 7.2.3, ferrules must be used
when multi-strand wire is used.
l
The rating of the VESDA VLC-EX include some intrinsic safety concepts (ic) in that the reset switch
used is not gas tight but is connected to internal circuits that keep the energy at the switch contacts low
enough to avoid any sparking. Thus the ic rating does not require the use of Zener barriers of similar
energy limiting devices for the electrical connections (power and signaling) to the VESDA VLC-EX.
Terminal A
Terminal B
1
Bias (-) (GND)
1
Shield
2
Reset (-) (GPI)
2
VESDAnet A (-)
3
Reset (+) (GPI)
3
VESDAnet A (+)
4
Bias (+)
4
Shield
5
LED (-) (GND)
5
VESDAnet B (-)
6
LED (+)
6
VESDAnet B (+)
7
FIRE (NO)
7
Power (-)
8
Fire (C)
8
Power (+)
9
Pre-Alarm (NO)
9
Power (-)
10
Pre-Alarm (C)
10
Power (+)
11
Fault (NO)
NC = Normally Close
NO = Normally Open
C = Common
12
Fault (C)
13
Fault (NC)
Legend
A
Terminal A
D
1.6 Amp Fuse
B
Terminal B
E
VESDAnet Socket
C
Relays
Figure 6-1: VESDA VLC-EX termination card VN Model (VLC-505-EX)
Summary of Contents for VESDA VLC-500-EX
Page 2: ......
