General Information
©PAT Rev. F 03/26/03
190136_f
1
1 GENERAL
INFORMATION
The PAT Anti–Two-block System has been designed to warn the crane operator of a two-blocking
condition of the crane. If a two-blocking condition is approached, the system will warn the operator by
sounding an audible alarm, lighting a warning light and locking out those functions which may
aggravate the crane's condition, whenever applicable.
NOTE:
The term "two-block" is a crane term that refers to a condition when the load handling device
comes in contact with the boom head. This condition, if not prevented, may cause the wire rope to
break, allowing the load to fall. Either raising the load into the boom head, or telescoping the boom out
without paying attention to the hoist line can cause a "two- block" condition.
2 WARNINGS
The PAT Anti-Two- Block System is an operational aid, which warns a crane operator of approaching
two-block conditions, which could cause damage to equipment and personal injury.
This device is not, and must not be a substitute for good, sound operator judgment, experience and
use of accepted safe crane operating procedures.
The responsibility for the safe operation of the crane remains with the crane operator who must ensure
that all warnings and instructions supplied are fully understood and observed.
Prior to operating the crane, the operator must carefully and thoroughly read and understand the
information in this manual to ensure that the operation and limitations of the system and the crane are
known.
Proper functioning is dependent upon proper daily inspection and observations of the operating
instructions set forth in this manual.
Caution: changes or modifications to this product which are not expressly approved by PAT could void
the user's authority to operate the equipment
.
