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Figure 4
6)
Protective Earthing
- Each
Dust
Alarm
®
ES
monitor is provided with a "protective conductor terminal"
which shall be terminated to the local earth ground potential
to eliminate shock hazard. Select wire size that can carry in excess of
the sum of all circuit's maximum amperage. Because the intrinsically
safe sensor probe does not pass a 500V dielectric withstand test to
earthing terminal, this probe shall be considered as electrically con-
nected to the enclosure.
7) Access to Terminal Connections
(See Figure 4) - Loosen
the cover lock screw and slide the lock mechanism down towards the
mounting point; tighten the screw to prevent parts from dislodging.
Remove the screw-on cover of the
Dust
Alarm
®
ES
and set it aside.
Customer accessible connections are for power and relay outputs. All
Dust
Alarm
®
ES
sensors come from the factory compatible for MAINS
VAC or low voltage DC operation.
8) Power Input
- Verify the intended voltage supply is compatible with
the voltage configuration indicated on the external nameplate. The
sensor can be powered with AC MAINS OR 24 VDC on separate
blocks. Connect the power wiring as shown in Figure 4. The customer
supplied power cable must have a minimum conductor size of 1mm
2
(18 awg). Additionally, the customer is responsible for installing a main
power disconnect as mentioned above.
l
Minimum 80C field wiring shall be used.
l
Haz-Loc Versions: AC Mains Supply...AC input power terminals shall
be protected by a fuse value no greater than 85mA.
l
Haz-Loc Versions: DC Supply...DC input power terminals shall be
protected by a fuse value no greater than 250mA.
9) Relay Output Contacts
- The
Dust
Alarm
®
ES
relay contacts are
power failsafe, meaning that the relays will be in the same state in a
power failure as they would be in an alarm state. The SPDT (form C)
relay contacts are electrically isolated from all other parts of the sen-
sor. The relay terminal blocks are labeled true to the relay contacts,
N/C-COM is active when relay is relaxed, and N/O-COM when relay is
powered. Connect relay contact wiring as shown in Figure 4.
l
Minimum 80C field wiring shall be used.
l
Relay contact terminals shall be protected by a fuse value
no greater than 5A.
10) RS-485 Terminal
- The RS-485 output is an isolated digital signal
output that can be used to monitor the active signal being measured,
and the general status of the sensor. This digital connection can be
daisy chained to multiple sensors on the same RS-485 network to
minimize the amount of wiring. Protocol used on this network is
Modbus RTU.
The RS-485 network cabling should be a single route that travels from
device to device, with no branches that form T’s or stars. A network
termination should be activated on any device that is at the physical
end of an RS-485 network. For the dust sensor models, this is
accomplished by:
ACTIVE
: termination jumper present (ends of RS-485 network)
DEACTIVATED
: termination jumper removed (all devices in the middle
of RS-485 network)
If the PLC/master device happens to be at the end of the network,
then a termination selector should be activated within that device.
See the Set-Up & Configuration section for guidance of the
calibration and configuration process.
11) USB PORT
- A USB mini-B connector is provided to allow easy and
fast connection of the sensor to a portable PC with the
Dust
Config
TM
application loaded onto it for sensor configuration. See bulletin # 764C to
navigate the
Dust
Config
TM
application.
NOTE:
The sensor USB connector is NOT isolated from local
earth ground; the USB connection is intended for local, temporary
connection during the configuration process only.
12) Re-assembly
- Replace the enclosure cover and secure cover
lock to protect the electronics from damage or contamination, unless
you are ready to proceed with setup of the
Dust
Alarm
®
ES
sensor at
this time.
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SET-UP AND CONFIGURATION
Remove the enclosure cover of the
Dust
Alarm
®
ES
unit and note the
controls and indicators on the label covering the top board assembly
(See Figure 5). The following is a brief description of each:
Indicators
:
1)
GREEN LED - The green LED indicates power is applied to
the sensor, and there is no alarm status. Also, when the green
LED is flashing the auto setup process is under way.
2)
RED LED - The red LED indicates an alarm condition. If the
red LED is on constant, the first threshold has been
exceeded. If the red LED is flashing, the second threshold has
been exceeded.
3)
YELLOW LED’s - The yellow LED’s indicate the state of the
relay it is adjacent too. When a yellow LED is lit, the
respective relay is powered. When the LED is off, the relay
is in a relaxed state.
RS-485 -
The serial communication parameters in the sensor
must be configured to match the master device on the RS-485
network before the Modbus output will function:
Figure 5
Parameter
Factory Default
Baud Rate:
38.4K
Parity:
NO
# Stop Bits:
2
Device #:
255
(aka: Modbus slave ID
or address #)
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