Environmental Monitoring System (EMS-5X, 10X and OS) Instruction Manual
20
3.3.3
230V Output to Ancillary Device
The EMS can be used to control a powered ancillary device such as beacons or solenoid valves.
Maximum demand of all connected ancillary devices will be governed by the supply fuse in the
unswitched spur and cable of a suitable cross-sectional area should be used.
Figure 13:
Using the EMS to Power a 230V Ancillary Device (Normally Closed)
Figure 14:
Using the EMS to Power a 230V Ancillary Device (Normally Open)
Use the EMS to power a 230V ancillary device as follows:
1.
) to select the correct
relay
.
2.
Wire the device (
and
If the device is not within the immediate
vicinity of the EMS panel, a
local isolator
must be installed
next to the device
for
safe isolation and maintenance.
The fuse
rating of the local isolator should be less
than that in the supply spur for circuit
discrimination.
Device
Relay
Mains Input
L E N
L E N
Power cable
from EMS to
device
Power cable from
unswitched
fused spur to EMS
Device
Relay
Mains Input
L E N
L E N
Power cable
from EMS to
device
Power cable from
unswitched
fused spur to EMS
