k.
High temperature drop across baghouse (red)*
l.
Low hopper temperature (red)*, one per hopper
m.
Low compressed air pressure (red)*
n.
High pressure drop across baghouse (red)*
o.
Power--ON (red)
p.
SYSTEM START (green)
q.
SYSTEM STOP (red)
r.
Cleaning mode OFFLINE selected (white)
s.
Cleaning mode ONLINE selected (white)
t.
Cleaning mode MALFUNCTION (red)*
2.8.5.5
Annunciators
Construct annunciators using factory-tested, burned in solid state
electronics. Contact circuitry shall meet IEEE C37.90.1. Power equipment
from the Government's 120 VAC station service source. Arrange power
supplies, circuit breakers, and input terminal blocks in groups to permit
servicing single section of the annunciator system without disabling the
entire system. Alarm window shall be 50 to 80 mm 2 by 3 inch. Use
electronic tone generators with variable pitch and volume controls.
2.8.5.6
Power Supplies and Switches
Provide mechanically interlocked, main circuit breakers mounted in the
baghouse panelboard for switching, and for primary and backup power
services. Provide a 20 A molded case circuit breaker for each tap from the
control bus. Provide one AC alarm relay connected to each AC bus with two
sets of contacts to close after a 2 second delay on loss of AC. Provide a
120 VAC control bus and a 120 V utility bus. Provide a 24 VAC power supply
for low voltage indicating lights and meters. Use metal position marking
nameplates and plastic identification nameplates.
2.8.5.7
Wiring
**************************************************************************
NOTE: Include control wiring installation and
amperage ratings as part of this section or as part
of Division 16, Electrical. If included in this
section, it must comply with Division 16,
Electrical. Amperage ratings shall comply with load
requirements. Provide an automatic transfer switch
to switch to the backup source upon primary source
failure. Provide a manual reset and provide an
alarm contact on transfer.
**************************************************************************
Provide cables, terminal blocks, grounding buses, and fuse boxes as follows:
a.
Cables: Prefabricated cables, [_____] meters feet in length, with
plug-in connectors at both ends of the interconnecting wire.
SECTION 15863N
Page 37
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