Itowa SW1 User manual

USER’S MANUAL
LOAD LIMITER
SW1

USER’S MANUAL
LOAD LIMITER
SW1
ITOWA S.A.U.
MALIMMC2GB
REV 0
27-07-05
Approved by Engineering Manager: J. Varela
ANY REPRODUCTION, EITHER COMPLETE OR IN PART, OF THIS MANUAL IS STRICTLY
PROHIBITED UNLESS ITOWA HAS GIVEN ITS WRITTEN CONSENT.
OTHERWISE, ITOWA RESERVES THE RIGHT TO INITIATE ALL APROPIATE ACTIONS AS
ESTABLISHED IN LAW
ITOWA RESERVES THE RIGHT TO MODIFY THIS MANUAL WITHOUT PRIOR ADVICE.

LOAD LIMITER SW1
USER’S MANUAL
i
TABLE OF CONTENTS:
1. INTRODUCTION 1-1
2. TECHNICAL DATA 2-1
3. SW1 MODEL 3-1
4. INSTALLATION AND CONNECTIONS 4-1
4.1.1. ASSEMBLING 4-1
4.1.2. INSTALLATION 4-1
4.2. ADJUSTMENT PROCESS 4-1
4.3. CONNECTION 4-3
4.4. CALCULATION OF CABLE TENSION 4-3
APPENDIX
A. USEFUL ADRESSES A-1

LOAD LIMITER SW1
USER’S MANUAL
1-1
1. INTRODUCTION
The SW load limiter has been designed to avoid the overloads, which usually appear in lifter
equipments as tower cranes, travelling cranes, elevators…
It avoids breakage in cables, hooks, wheels, beams and rails distortion, and the rest of damages and
accidents caused by overloading.
The directive 89 / 392 / CEE considers that all of the new cranes must incorporate a load limiter and
the new risk’s prevention law for safety at work remarks the need for suppression of dangerous points,
because the user is responsible for the applied loads, that cannot exceed the maximum allowable
one.
The SW load limiter represents a minimum economic cost in comparison with others electronic load
limitation systems with load cell, that is possible because of its design and low maintenance cost
(pulleys’ lubrication and tare, every 6 months).

LOAD LIMITER SW1
USER’S MANUAL
2-1
2. TECHNICAL DATA
Repeatability: 1 % F.E.
Operation limit temperatures: - 30º C / + 80º C ( -22º F / 176º F)
Overload: 300 % F.E. (F.E. = Crane nominal load)
Output of contacts: 15 A ; 250 Vac
Disconnection limit: 100 % F.E.
Disconnection tolerance: 10 % F.E.
Dimensions: 165 x 95 x 85 mm (67 x 37,5 x 33,5 inches )