Eaton Crouse-Hinds AFU Serie Información De Instalación Y Mantenimiento

AFU/AFUX Series, Model M7 Conveyor
Control Safety Switches with Slack Condition
Installation and Maintenance Information
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE
WARNING
To avoid the risk of fire and electric shock, this product
is to be installed by a qualified electrician only.
ApplICATION
AFU and AFUX conveyor control safety switches are used
as emergency or normal "STOP" switch for
conveyor lines, cranes, unloaders, bulk handling
systems, and similar equipment.
When installed, an actuating line or cable is connected from
a fixed point to the loop on the end unit. A pull on the line
of the required force (see Table I) activates the plunger,
opening the switch and tripping the red-painted indicating
arm forward which locks the plunger in the activated (switch
open) position. A missing or slack
actuating line or cable provides the same open switch
condition. Returning the indicating arm to its normal
position resets the mechanism.
AFU Series conveyor control safety switches are
suitable for use in Class II, Groups E, F, G, and Class III
hazardous (classified) locations as defined by the National
Electrical Code (NEC) and Canadian Electrical Code
®
(CEC).
AFUX Series conveyor control safety switches are
suitable for use in Class I, Groups C, D; Class II, Groups
E, F, G, and Class III hazardous (classified) locations as
defined by the NEC.
Figure 1
Typical Application of Safety Switches
INSTAllATION
WARNING
To prevent electrical shock, be sure all power is turned
off before and during installation and maintenance.
Mount body in vertical position as shown in Figure 2.
Use bolts or screws through two 7/16 inch diameter
mounting lug holes.
Note: 1-1/2 inch center mounting hole spacing permits
attachment of body to the web of standard 3 inch
angle iron.
IF 958 • 04/14 Copyright
1.62
Normal Position.
5
.12
1.90
A
B
Front View
®
Tripped
position of
indicated
arm.
4.12
9.50
Right Side View
Dimensions (In.)
Model
A
AFU 9.14
AFUX 9.08
Figure 2 - Dimensions
Disassemble unit by removing access covers and switch
housing(s) from body.
Install conduit into hubs as required and pull all
necessary wires into body.
CAUTION
To prevent equipment damage, hammers or prying
tools must not be allowed to damage the flat
ground-joint surfaces. Do not handle covers and switch
housings roughly, or place them on surfaces that might
damage or scratch the flat ground-joint surfaces.
Note: Hazardous location information specifying class
and group listing is marked on the
nameplate of each enclosure.
2014 Eaton's Crouse-Hinds Business
©
IF 958
To avoid explosions, all unused conduit openings
must be plugged. Plug must engage a minimum
of five full threads and be a minimum of 1/8 inch
thick.
To avoid explosions, conduit sealing fittings may be
required to be installed in each attached conduit run
to comply with the latest edition of National Electrical
2 15/32
Code Section 501-5 and/or 502-5 plus any other
applicable code.
2 15/32
7/16" Dia. mtg. Holes.
In order to prevent explosions, AFUX units are
designed to meet Class I, Groups C, D; Class II,
Groups E, F, G, and Class III hazardous (classified)
A
location requirements of the National Electrical
Code. These units are supplied with machined
metal-to-metal joints for switch housing and access
covers. Do not use gaskets.
Normal position of
indicating arm.
Determine opening in body that will be used to mount the
switch assembly. Each assembly is to be positioned as
shown in Figure 2. The right switch assembly is marked R#
on indicating arm and the left switch
assembly is marked L# on indicating arm. Using these
openings, connect each switch to the line wires. Attach
wiring to switch using screws supplied, following your
system wiring pattern in compliance with the National
Electrical Code plus any other applicable code. See Figure
3 for switch contact arrangements.
.99
Remount switch assembly(s) to body with four screws
provided, orienting indicating arm in correct position. See
above WARNING statement.
Note: During installation, use care to prevent grit, dirt,
or other foreign material from lodging on mating
surfaces of covers and body. Should any such material
settle on the mating surfaces, clean with kerosene or
Stoddard Solvent. To avoid the possibilities of an
explosion, oxidation, and corrosion, do not use gasoline or
B
similar solvents.
12.92
Contact
12.86
Arrangement
2 normally
open
2 normally
closed
Note: For 2 pole applications, wire only contacts 1 through 4.
Figure 3 - Switch Contact Arrangement
Page 1 IF 958 • 04/14
WARNING
WARNING
Test wiring for correctness with continuity checks and for
unwanted grounds with insulation resistance tester.
Replace access covers on all unused openings, making
sure that gaskets are properly seated when they are
required. See above WARNING statement.
Connect pull cable from fixed point to ring on switch
assembly. Supports may be necessary to ensure that line
or cable weight will not activate switch. See Table I for pull
requirements. When connecting the pull cable to the ring,
the indicating arm must be brought to the normal position
as shown in Right Side View of Figure 2. This position is
a neutral position indicated by a machined groove in the
operating shaft. Using a turnbuckle, adjust the pull cable
to an initial tension which exposes this groove. The groove
must be in full view but should not be more than 1/8 inch
from the brass bearing. Moving or pulling line opens the
switch and trips the red indicator flag, locking switch in
open position. The cable used must be able to maintain
the initial tension over time. To prevent false tripping, do
not use a material that will stretch and simulate a slack
condition.
To reset mechanism, return indicating arm to its normal
position. See Figure 2.
Diagram
4
3
N.O.
Description
N.C.
1 2
8
7
N.O.
N.C.
Single End Left
5 6
Single End Right
Double End
Copyright 2014 Eaton's Crouse-Hinds Business
©
Figure 4 - Switch
Table I
Actuation ("pull") Requirements
DpDT Switch
Additional
7½ Amp at 600 VAC Max.
Operating
½ Hp 120 VAC, 240 VAC
Force
10 Amp 125 VDC,
Required
(lbs.) 5 Amp 250 VDC
With One 4 pole Switch in
Each End Unit
5 AFU/AFUX0333-50
8 AFU/AFUX0333-60
5 AFU/AFUX0333-05
8 AFU/AFUX0333-06
5 AFU/AFUX0333-55
8 AFU/AFUX0333-66
Page 2