iSi LL18 User manual

1. Install Load Limiter device to the non-moving rope/
chain near to the anchor/suspension point on a
slacked (non-loaded) hoist.
2. Torque rope clamps down. Cotter pins are simply to
keep the unit in place.
3. For preset units see “sizing overload limit devices”.
4. The normally closed contact wires should be
placed in series with an appropriate part of the hoist
circuitry usually the contactor coil of the UP contactor.
As the load increases the switch will open at the ap-
proximate setting and shut down the movement of the
hoist in the UP direction. Slack Load option is put in
the DOWN circuit of the hoist.
5. Hysteresis: All electro-mechanical devices exhibit
hysteresis such that to RESET it is likely that the
load must decrease below the “trip point” in order
to reset.
6. Repair of any Load Limit device should not be at-
tempted except for superficial problems such as a cut
wire etc. NEVER disassemble and reassemble any
unit. The “link” pins on the Chain Load Limit devices
are of special grade steel and should never be modi-
fied or replaced with other than factory supplied parts.
Installation of Load Limiters
485 Dundee Avenue, Suite 85
East Dundee, IL 60118, USA
Phone: [phone]
Fax:[phone]
INDUSTRYSOLUTIONS
I N T E R N A T I ON A L, I N C.
561 Plate Drive, #5
East Dundee, IL 60118, USA
Phone: [phone]
Fax: [phone]
Model * Best Torque Socket
LL18, LL28 8 Nm or 5.9 Ft. Lbs. 13mm
LL45, LL60 10 Nm or 7.4 Ft. Lbs. 16mm
LL80, LL150, LL200 15 Nm or 11.1 Ft. Lbs. 19mm
table 3 Rope Clamp Bolt Torque Rating
fig. 3b Wire rope Hoist Load Limit-
er showing internal mechanics,
rope clamp and cover plate for
adjusting screw.
WIRE ROPE STYLE
C
B
A
Protective cover plate for adjustment screw.
WIRE ROPE STYLE - Setting in the field:
a. Detach the back protection plate.
b. Pick up the heaviest load required ensuring that it is not more than the safe working load of the crane &
hoist combination.
c. Turn the adjusting screw (under protective cover plate) out fully, pick up safe working load, turn adjusting
screw in until cut out then turn back about 1/8 turn and lock. The adjusting screw is very sensitive.
d. Lower the load and lift up again to ensure correct functioning. Do this several times as a check. You may
have to fine tune several times. * USE TORQUE WRENCH to put cable clamp on hoist!
e. Reattach back protective plate. (see * Best Torque below)
Model Link Pins
Allen Hex Adjusting Collar Lock Nut
LL12C 6mm 13mm 19mm 38mm
LL17C 10mm 19mm 25mm 50mm
LL28C 10mm 19mm 25mm 50mm
table 4 Chain Link Pin, Adjusting Collar and Lock Nut sizes
fig. 4b Chain hoist load limiter showing adjustment
collar lock nut and link pin placement (included).
CHAIN STYLE
LOCK NUT –do not adjust
all the way out.
ADJUSTING COLLAR
B
A
LINK PIN PLACEMENT—- ONLY USE ISI SUPPLED !!!!
CHAIN HOIST STYLE – Setting in the field:
a. Install Chain Load Limiter device using Link pins provided, see table 4.
b. Use the heaviest load required ensuring that it is not more than the safe working load of the crane and hoist
combination.
c. LOOSEN LOCK NUT. Turn the adjusting nut IN (clockwise) to increase the chain load setting and or OUT
(counter-clockwise) to decrease the setting (see fig 4b). The adjusting nut is very sensitive and a small adjust-
ment will cause a relatively large change in setting. The adjusting nut is tight and is constantly under internal
pressure.
d. When desired cut out point is reached, the N.C. contact will open (test several times to assure setting), the
adjusting nut must be locked by tightening the lock nut (see fig 4b).
e. CHECK load cut out again to ensure proper setting. You may have to fine tune.
f. Ensure that any hoist “top” limit switches are set and arranged so the Chain load limit device could not be
broken by the bottom block when at maximum lift height.
Clamp bolt
fig. 3b
fig. 4b
© 2019 Industry Solutions International, Inc. Prices and specifications are subject to change without notice.
N.C. Circuit
N.C. Circuit
1
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© 2019 Industry Solutions International, Inc. 2
PROPER INSTALL OF “PRESET”
HOIST ROPE LOAD LIMIT DEVICES
1. If unit has been preset at factory to a “rope load” trip point, then it is necessary for the installer to
use an accurate torque reading wrench upon installation. The two screws, which hold the clamshell
clamp against the rope, is precisely set at the factory when “preset” trip point is specified. If an accurate
torque reading wrench is not used the preset value becomes very inaccurate. Test weights must be used to
reset the unit manually. In addition, the 2 screws rely on an accurate rope diameter.
Accurate torquing of the clamshell holding bolts
using a calibrated torque wrench.
Accurate rope diameter must have been reported
Rope diameter is critical since the clamshell has a precise diameter hole for clamping
the hoist rope. This is especially important when a unit has been preset at the factory.
2. Preset is done on a single fall of rope. A multiple fall of rope might show slight differences in how the
load is “shared”. Usually this is very small and insignificant.
3. Be aware that old stretched ropes may not have the same diameter as when new. A manual adjustment
will then be necessary. Be advised that stretched ropes may not be acceptable to OSHA.
4. Once a manual adjustment of the internal setscrew is made, then the preset value is “gone.”
5. Retesting or re-preset at the factory is available at a charge.
6. Another source of preset error is an improper initial calculation of the individual rope load on a single
rope of the hoist. Although the setting is correct on the unit, the hoist calculation was done incorrectly
and the trip point is thus set incorrectly.
PROPER INSTALL OF “PRESET”
HOIST ROPE LOAD LIMIT DEVICES
1. If unit has been preset at factory to a “rope load” trip point, then it is necessary for the installer to
use an accurate torque reading wrench upon installation. The two screws, which hold the clamshell
clamp against the rope, is precisely set at the factory when “preset” trip point is specified. If an accurate
torque reading wrench is not used the preset value becomes very inaccurate. Test weights must be used to
reset the unit manually. In addition, the 2 screws rely on an accurate rope diameter.
Accurate torquing of the clamshell holding bolts
using a calibrated torque wrench.
Accurate rope diameter must have been reported
Rope diameter is critical since the clamshell has a precise diameter hole for clamping
the hoist rope. This is especially important when a unit has been preset at the factory.
2. Preset is done on a single fall of rope. A multiple fall of rope might show slight differences in how the
load is “shared”. Usually this is very small and insignificant.
3. Be aware that old stretched ropes may not have the same diameter as when new. A manual adjustment
will then be necessary. Be advised that stretched ropes may not be acceptable to OSHA.
4. Once a manual adjustment of the internal setscrew is made, then the preset value is “gone.”
5. Retesting or re-preset at the factory is available at a charge.
6. Another source of preset error is an improper initial calculation of the individual rope load on a single
rope of the hoist. Although the setting is correct on the unit, the hoist calculation was done incorrectly
and the trip point is thus set incorrectly.
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PRESET ROPE LOAD LIMITS
When accurate rope diameter and rope load information is given to ISI the device
is set accurately to within specification.
Some sources of inaccuracy:
Incorrect installation technique
Damage in shipment
Incorrect initial calculation of rope load
Incorrect rope diameter
Inaccurate unadjusted torque reading wrench used (or NOT used)
It is the responsibility of the installer to verify response of the unit at the installa-
tion.
ISI will re-preset or test any LL unit within 90 days of ISI shipment at no charge
FOB East Dundee, IL.
© 2019 Industry Solutions International, Inc. 3
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