Honeywell SYA14 Series Manual page 458

Snap Action Cable Pull Safety Limit Switch
ACTUATING CABLE INSTALLATION
Step 1 - Ensure you have the following (Figures
3 and 4) :
• Plastic coated aircraft cable 1/8 in (3,18 mm) to
3/16 in (4,76 mm) dia. Use a distinctive color,
such as red, to differentiate the actuating cable
from other wires or cables in the area.
• Thimbles, U-bolt clamps.
• Cable supports (eyebolts).
Step 2 - Attach cable to switch:
• Ensure cable is fully seated and tightly fitted in the
thimble groove.
• Attach using two U-bolt clamps. U-bolt clamps
should be installed as close as possible to
thimble.
• Tighten U-bolts to 4.5 in-lb (0,51 N-m) for 1/8 in
(3,18 mm) cable; 7.5 in-lb (0,85 N-m) for 3/16 in
(4,76 mm) cable.
Step 3 - Install cable supports:
SWITCH DAMAGE
Do not allow excessive side loads that could bend
the switch operating shaft.
Failure to comply with these instructions may
result in product damage.
• Install a cable support as close as practical to end
of shaft without interfering with switch operation.
• If cable tension adjusting turnbuckle is in mid-
span of cable, the first cable support should be in
line with, and no further than, 12 in (30 cm) from
the end (eye) of the shaft. If adjusting turnbuckle
is attached directly to shaft eye, this distance may
be increased to 18 in (46 cm).
• Support cable at intervals no greater than 8 ft
(2,4 m).
Figure 5: Single Head Switch with Turnbuckle and Endspring
2
1
Figure 6: Duplex Head Switch with Turnbuckle and Endspring
For application help: call 1-800-537-6945
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5
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Honeywell • MICRO SWITCH Sensing and Control 3
REQUIRED ENDSPRING AND TURNBUCKLE
INSTALLATION
Step 1 - Ensure you have the following (Figures
5 and 6) :
• Endspring, turnbuckle, jam nuts (supplied with
switch).
• Thimbles, U-bolt clamps.
Step 2 - Install endspring: Reduces effects of
ambient temperature fluctuations and provides a
measure of protection against excessive force being
applied to cable.
• Install an endspring within cable span, preferably
at end of cable opposite switch (see Actuating
Cable Installation, Step 2).
Step 3 - Install turnbuckle: Ensures proper cable
tension.
IMPROPER INSTALLATION
Do not install turnbuckle too closely to cable
supports or other barriers that may hinder proper
operation.
Failure to comply with these instructions
could result in death or serious injury.
• Install within cable span in same manner as
endspring. Use jam nuts to maintain adjustment.
Key
1. Aircraft cable
2. Cable support (cutaway view of eyebolt)
3. Turnbuckle
4. Thimble and two U-bolts
5. Endspring or second cable pull limit switch
Key
1. J-hook turnbuckle
2. Aircraft cable
3. Cable support (cutaway view of eyebolt)
4. Thimble and two U-bolts
5. Endspring or second cable pull limit switch
PK 81592
ISSUE 3