Voltage Conversion - Coffing Hoists EC3 Series Operating, Maintenance & Parts Manual

SECTION VI TROUBLESHOOTING
Problem
1. Hoist overloaded.
2. Motor brake is dragging.
Lack of Proper
3. Low voltage.
Lifting Speed.
4. Overload limiting clutch intermittently slipping.
1 . Need transmission oil change, or improper lubricant has
Load Brake
been used.
"Noise." (Erratic
tapping sounds
2. Load brake malfunctioning.
or squeals)
1. Brake needs adjustment.
Motor Brake
Noise or Chatter.
(While starting
2. Low voltage.
hoist)
Motor Brake 1. Brake needs adjustment.
"Buzz." (Anytime
2. Broken shading coil on brake frame.
hoist is running)
SECTION VII WIRING
SAFETY NOTES
Disconnect power from hoist before removing end covers.

7-1.VOLTAGE CONVERSION

Standard single speed units are convertible from 460 to 230 volts.
Conversion to the alternate voltage can be accomplished with the
following procedure.
a. Be sure power is disconnected from hoist. Remove long end
cover.
b. To convert the hoist from 460 to 230 volts, reconnect leads
T4, T5 , T6, T7, T8, T9, H2, H4, SI, and S2 per the 230 volt
connection diagram on Wiring Diagram, Figure 7-1.
Do not move any wires or make any changes to the wiring
except at the gray terminal block.
c. After converting voltage, check for proper phasing of three
phase units and check for proper limit switch operation.
7-2. WIRING DIAGRAMS
The wiring diagrams for standard hoist models are reproduced on
the following pages. In addition, every hoist should have a wiring
diagram located inside the long end cover.
Probable Cause
1. Reduce load to within rated capacity of hoist.
2. Check for proper brake adjustment or other defects. Sec paragraph 5-3.
3. Bring up voltage to plus or minus 10% of voltage specified on hoist. Line
voltage should be measured while hoist is lifting load.
4. Replace clutch,
1. Change transmission oil. Sec Table 5-1.
Note: Hoist Warranty is void if unapproved oil is used.
2. Check load brake operation. See Figure 4-3.
1. Adjust as per paragraph 5-3.
2. Check voltage at hoist power cord with hoist starting. Voltage should be no less
than 90% of the voltage specified.
1. Adjust as per paragraph 5-3.
2. Replace shading coil or complete brake frame assembly.
19
Remedy
EC3-680-3 February 2017
Order # 5041558-0 & 5041679-0