Model S4000TH
17
NOTE:
Fault relay is normally energized. Relay will change state after power up.
WARNING:
Contact with PCB components should be avoided to prevent damage by static
electricity. All wire connections are made to the Terminal Blocks.
WARNING:
Relay contacts must be protected against transient and over voltage conditions
(Figure 13).
Figure 13: Relay Protection for DC and AC Loads
North American Approved Applications -
The alarm relay contact ratings are 8 A @ 250 VAC
and 8 A @ 30 VDC resistive max.
European Union (EU) Approved Applications -
The alarm relay contact ratings are 8 A, 30 V
RMS/42.4 V peak or 8 A @ 30 VDC resistive max.
3.5.6 European
Union
(EU) Approved Applications
Interconnecting cables must have an overall screen, or screen and armor. Cables BS5308 Part
2, Type 2, or equivalent, are suitable. Note that the terms ‘screen’ and ‘shield’ are equivalent for
the purpose of this manual. The cable armor must be terminated in a suitable cable gland, at
the detector, to ensure a positive electrical connection.
3.5.7 Cable
Termination
in the Non-hazardous Area
The
cable
armor
must be connected to
safety earth
in the safe area.
The
cable
screen
(drain wire) must be connected to an
instrument earth
in the safe
area.
The
power
supply
0V return
must be connected to an
instrument earth
in the safe
area.
The interconnecting cables should be segregated from power and other noisy cables.
Avoid proximity to cables associated with radio transmitters, welders, switch mode
power supplies, inverters, battery chargers, ignition systems, generators, switch gear,
arc lights, and other high frequency or high power switching process equipment. In
general, a minimum separation of at least 1 meter between instrument and other
cables should be maintained. Greater separations are required where long parallel
cable runs are unavoidable. Avoid running instrument cable trenches close to
lightning
conductor earth pits.
Complete all cable insulation testing before connecting the cable at either end.
