Nitchi MH-5 User manual

NITCHI-MATIC
ELECTRIC CHAIN HOIST
MODELS
• MH5 • MHT5 • MHC5
TROLLEYS MECHANICAL JOINING TYPE
MODELS: MET5, MGT5 AND MPT5
Operating Instructions Booklet
The hoist operator must receive this operating instructions booklet!-
Thoroughly read this operating instructions booklet before operating the
trolley and electric chain hoist.
Carefully store this operating instructions booklet after reading it.
This operating instructions booklet contains important information that will be
necessary when inspecting and maintaining the trolley and electric chain hoist.
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-
The hoist operator must read this operating instructions booklet!
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The above information will be required when purchasing spare parts and when making inquiries.
Copy them from the name plate on the hoist and save them for future reference.
Customer’s notes:
N.B.
Model
Serial No.
Date Purchased

PREFACE
NITCHI products are made of the best selected materials, and processed through up-to-date
streamlined production facilities by skilled NITCHI engineers under severe quality control.
To assure absolute safety, dependability and satisfactory performance, rigid nal inspections and tests
in accordance with our own standards are carried out on the NITCHI products before they leave the
plant.
WARRANTY
NITCHI products are guaranteed to be free from any defects in materials or workmanship. lf any part
or parts proves defective within 1 year from the date of purchase, we will replace the part no-charge,
F.O.B. Osaka, Japan, provided the part claimed defective is returned to our factory through authorized
NITCHI Distributors or Agents with transportation prepaid. However, we reserve the right to decline res-
ponsibility for these which repairs are made or attempted by others or misused or carelessly operated
or maintained.
SAFETY PRECAUTIONS
Misuse of an electric chain hoist can cause dangerous situations such as dropping of the hoisted load
or electrical shocks. To ensure proper use, it is essential that this instructions booklet and the manual of
any other equipment that is to be used at the same time be read and fully understood before installing
or servicing the equipment. Before use, the operator must be fully familiar with; the equipment, with
all of the safety procedures and the warning provisions. In this instructions booklet you nd two cate-
gories of warning: “DANGER”and“CAUTION” .
EXPLANATION OF THE WARNINGS
DANGER DANGER are incorrect usages that can lead to death or serious injuries.
CAUTION CAUTION are incorrect usages that can lead to light injuries or property damage.
Situations classied as "CAUTION “ may result in serious conditions in some cases.
Precautions must be obeyed no matter what category they come under.
!
!
• Serious injuries are permanent disabilities, wounds that require hospitalization or prolong
outpatient treatment such as; loss of eyesight, injuries, burns, electrial shocks, and broken bones.
• Light injuries mean burns and electrical shocks that do not require hospitalization and prolong
outpatient treatment.
• Property damages are major losses to the building, equiment or machinery.
EXPLANATION OF THE SYMBOLS
Procedures that are forbidden (not allowed) during operation of the product. Examples are shown in
drawings or expressed in words near the symbol.
Procedures that are mandatory (that must be carried out) during the operation of the product.
Examples are shown in drawings or expressed in words near the symbol.
This symbol expresses that an eective ground wire is absolutely necessary .
Details will be shown in circuit diagrams, drawings or expressed in words near the symbol.
This symbol gives warning of electrical shocks that can occur when handling the product.
Details will be shown in drawings or expressed in words near the symbol.
This instructions booklet must be stored where it can be easily accessed by the user.
PROHIBITED
MANDATORY
GROUND
CONNECTION
ELECTRIC
HAZARD
N.B.

1. OVERALL HANDLING
2. IMPORTANT!!
The following warnings and safety procedures are essential for avoiding possible bodily injury and
property damage.
2.1 BASIC SAFETY PROCEDURES
CAUTION
NEVER lift more than the rated load marked on the hoist.
NEVER use the hoist to lift, support or transport people.
NEVER lift or transport loads over or near people.
ALWAYS read the operation and safety instructions.
2.2 SAFETY PROCEDURES PRIOR TO USE:
CAUTION
ALWAYS The operator of the hoist must be a person who is completely familiar
with all safety and operation procedures.
ALWAYS Check the hoist before use and conrm that the load chain is well
lubricated.
ALWAYS Check the brake before use.
ALWAYS Check the safety latches to see if they work properly. Broken and missing
safety latches must be replaced immediately.
ALWAYS Use genuine NITCHI parts and chains.
NEVER Modify the hoist.
NEVER Use modied or deformed hooks.
NEVER Use a hoist when malfunction, unusual performance, damage or
extensive wear are found.
NEVER Abuse the over-hoisting/over-lowering limit switch mechanism by using it
regularly.
NEVER Remove or obscure the warnings and nameplate on the hoist.
DANGER
The unit (electric chain hoist and trolley) must be operated only by people who fully understand the operating instruc-
tions booklets and the precautions on the warning name plates. People without the necessary qualications must not
operate the unit or carry out hook and sling connecting operations. lnspect the unit before operating it, and carry out
periodical inspections. Never hoist/lift people!
!
!
!

SAFETY PROCEDURES DURING OPERATION
CAUTION
ALWAYS Set the load properly in the hook.
ALWAYS Conrm that the safety latch has closed completely.
ALWAYS Take up the slack of the load chain and sling carefully, and make the initial
load lifto shock as small as possible.
ALWAYS Use a hoist within the“ Duty rating“ , ED % or time rating.
ALWAYS Avoid excessive inching and make sure that the hoist motor completely
stops before reversing the operating direction.
NEVER Allow your attention to be diverted when operating the hoist and never leave a suspended
load unattended.
NEVER Operate the hoist unless the load is centered underneath it.
NEVER Use the hoist with twisted, kinked, damaged or worn chain and never
attempt to lengthen the load chain.
NEVER Use the load chain as a sling and never apply the load to the tip of the hook.
NEVER Use the load chain so that it comes in to contact with an edge.
NEVER Allow the chain or hook to be used as a ground for welding and never touch them with
live welding electrodes.
NEVER Abuse the friction clutch by using it frequently. lmproper use can severely
damage the hoist and lead to serious injuries.
NEVER Pull on the pendant control cable.
MAINTENANCE SAFETY PROCEDURES
CAUTION
ALWAYS Have a qualied service person inspect the hoist periodically.
ALWAYS Clean the hoist thoroughly and keep the load chain well lubricated.
NEVER Attempt to extend, repair or weld the load chain.
NEVER Touch live electrical parts.
!
!

STANDARD SPECIFICATIONS................................................................................................................................................................ 1
INSTALLATION............................................................................................................................................................................................... 6
Connecting the Chain bucket................................................................................................................................. 6
Lubrication...........................................................................................................................................................................7
Circuit breakers..................................................................................................................................................................7
Power source cabIe........................................................................................................................................................ 8
Power source cabIe specications........................................................................................................................8
Adjusting the Trolley width....................................................................................................................................... 9
Setting the Trolley onto the beam........................................................................................................................10
Connecting the hoist to the trolley......................................................................................................................11
Connecting the Power source cabIe....................................................................................................................12
lnspection After lnstallation......................................................................................................................................13
INSPECTION & MAINTENANCE.......................................................................................................................................................... 14
INSPECTION BEFORE USE......................................................................................................................................................................14
MONTHLY AND ANNUAL INSPECTIONS...................................................................................................................................... 14
INSPECTION POINTS..................................................................................................................................................................................15
Hook & Chain lnspection.............................................................................................................................................17
ADJUSTING THE BRAKE............................................................................................................................................................................18
Adjusting the electromagnetic brake.................................................................................................................18
HOW TO USE THE CHAIN LIMIT GOUGE.....................................................................................................................................19
TROUBLESHOOTING..............................................................................................................................................................................20
CIRCUIT DIAGRAM.....................................................................................................................................................................................21
SPARE PARTS TABLE AND SPARE PARTS CODE TABLE........................................................................................................32
3. CONDITIONS OF USE
The MH-5 Series electric chain hoists and trolleys are designed for the vertically lifting, lowering and ho-
rizontal transportation of loads by operating the pendant push button switch, and must be used within
the following conditions:
1. Power source : As specied on name plate of the electric chain hoist, and motorized trolley.
2. Trolley beam : Trolley to be used only on the designated beams.
3. Temperature : / 15°C -/+ 40°C
4. Humidity : Under 90%
5. Protection : Hoist: IP43 (Do not use in rain or dusty environments.)
Trolley: IP42 (Do not use in rain or dusty environments.)
6. Enclosure status: Do not use in ambient conditions that contain steam or explosive gases.
7. Duty rating: Model MH5 30 minutes
Model MHT-5 20/20 minutes (slow / fast)
Model MHC-5 15 minutes
Model M-ET-5 30 minutes
8. Grade: Models MH-5, MHT-5, MHC-5, M-ET-5 M4 & M5
CONTENTS