Electric Chain Hoists (Single Brake)
Model NECH
PAGE: 24
NECH-0214
ACI Hoist & Crane | 2721 NE 4th Ave Pompano Beach, FL 33064| 954.367.6116
Visit WWW.ACIHOIST.COM for the most current information
3.
Interchange any two lines supplying power to the hoist.
4.
Re-energize power supply to the hoist.
5.
Check the hoist travel direction for correct hook motion by pressing
UP
on the hoist control device. If the
direction of the hook travel matches the direction marking of the hoist control device button activated then the
hoist motor is properly phased. If the direction of the hook travel does no match the direction marking of the
hoist control device button activated the hoist motor is improperly phased and must be corrected by repeating
steps 1 through 5.
4.3.1 Trolley Motor Phasing
If the hoist has a motorized trolley please see the trolley’s operation manual for proper motor phasing.
4.4
Testing Limit Switches
All testing of limit switches should be accomplished without a load on the hook of the hoist. All tests should be accomplished
by using the low speed of variable-speed hoists, or inched into the limit if the hoist is a single-speed unit. Before checking
limit switches the function of limit rocker arms should be checked by pushing the rocker arms up and down to ensure they
function properly.
To check lower limit device, operate the hoist in the lowering direction until motion of the load block stops. While lowering
the load block, watch the length of the load chain on the unloaded side of the hoist. If the loop will become taut before the
lower limit device stops load block motion,
STOP
the hoist motion, the lower limit device requires adjustment. The hoist
lower limit device is set at the factory to stop lower travel of the load block with approximately nine to fifteen (9-15) links of
load chain extending beyond the chain guide on the unloaded side of the hoist. It is recommended that the lower limit device
be set to prevent the load block from resting on the floor and allowing the load chain to go slack. If adjustment of the lower
limit device is required, refer to the Limit Switches section of this manual.
To check upper limit device, operate the hoist in the lifting direction to a point where the block is about 12 inches below the
hoist. If the hoist has more than one speed, continue to raise the load block at low speed or if hoist is a single speed unit
inch the load block in the lifting direction until motion of the load block stops. If the load block will hit the hoist or hoist frame
before the upper limit device stops the load block motion,
STOP
the hoist motion, the upper limit requires adjustment. If
adjustment of the upper limit device is required, refer to the Limit Switches section of this manual.
1.
Operate the hoist without a load on the hook through the entire lifting range to ensure that the limit switches
function properly and that the load block and hook do not interfere with any other items or pieces of equipment
located in the operating area.
Never operate the hoist without the protection of properly functioning limit switches.
Hoist limit switches shall
NOT
be used as a normal means of stopping travel motion or the load; these are emergency
devices only.
The primary upper and lower limit switch should be checked without a load on the hook at the start of each shift, or
before the first time the hoist is to be operated during each shift.
These instructions apply to limit switch adjustment for an unloaded load block only. Limit switches must be adjusted to
prevent the load block or the load being lifted from coming into contact with any part of the hoist, crane, hoist support
structure, or other equipment where the hoist is installed.
