Edwards Signaling 877 - Manual

876 And 877 Grille Type Adaptahorn Installation
Sheet
Description
The 876 and 877 series are UL listed, FM approved, vibrating
horns in a NEMA Type 4X, 12, 12K rated enclosure. They are
low current, high decibel horns designed for heavy-duty use
either indoors or outdoors. The die-cast weatherproof box has
a durable, corrosion resistant, electrostatic heat flowed powder
epoxy gray finish. The horns are intended for general signaling
applications.
PLC Compatibility
The electrical input load requirements for PLC compatible
signaling devices are listed in Table 1. Signaling devices may
be directly connected to output cards that meet these load
requirements.
24V DC electromechanical horns such as the 877-G1 can
produce transient spikes and should only be used on PLC
output cards that have inherent transient spike suppression.
The Process Control Engineer should consult the PLC
manufacturer when connecting 24V DC electromechanical
devices to PLCs.
Installation
1. Using a 5/64" allen wrench (supplied), loosen both set
screws (located on either side of backbox) and remove
horn from backbox.
2. Fasten backbox to wall or partition as follows:
a. Remove the screw hole knockouts in the backbox.
b. Insert caplugs (supplied) in screw holes in backbox.
c. Drive #8 wood screws (supplied) through caplugs into
mounting surface.
d. Secure conduit at entrance hole.
3. Ground the unit using the terminal screw in the box or by
other appropriate means.
4. Connect one wire to each terminal in backbox.
5. Orient the horn so that the "E" is at the top and plug horn
on backbox. Tighten set screws.
6. The volume is factory set at the maximum level. To
reduce volume level, turn set screw (located on grille front)
clockwise using a 1/16" allen wrench (supplied).
Table 1: PLC Compatibility
Catalog number 876-N5 877-G1
Operating voltage 120 VAC 24 VDC
Maximum off state
leakage current 25 mA 25 mA
Continuous on current 125 mA 160 mA
Surge (inrush/duration) 1.02 A/0.000026 ms 1.7 A/0.000042 ms
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