2.4.9.1
General
Crane shall be equipped with a complete digital radio remote-control system
to permit full control of crane from a portable wireless transmitter.
System shall be the use-proven product of a manufacturer regularly engaged
in design and manufacture of crane radio remote-control systems. System
shall be of a "fail-safe" design so that the failure of any component or
loss of signal will cause all crane motors to stop. The system shall
permit complete, independent and simultaneous operation of all crane
functions. System frequency shall be in the 72MHz-76MHz band. Receiver
shall include transfer relays if crane is also cab or pendant controlled.
2.4.9.2
Transmitter
**************************************************************************
NOTE: Provide bridge and trolley directions
normally oriented to main compass headings. Delete
requirement for auxiliary hoist control when no
auxiliary hoist is used.
**************************************************************************
Transmitter shall be portable and complete with an adjustable belt or
harness. Crane motion switches shall be spring-return to OFF. Transmitter
shall be provided with two spare batteries and battery charger to permit
continuous operation. A key-lock with the key removable in the OFF
position only shall be provided to control transmitter operation. A blue
signal light mounted on crane visible from floor shall be provided to
indicate the main contactor is energized. POWER-OFF toggle-switch shall be
bright red. Transmitter shall be provided with the following controls:
Hoist-up/down.
Bridge-[_____].
Trolley-[_____].
POWER-ON.
POWER-OFF.
Auxiliary Hoist-up/down.
2.4.10
Protection
2.4.10.1
Main Line Disconnect
A main line disconnect consisting of a combination circuit breaker (50,000
AIC) and non-reversing starter, starter without overloads (mainline
contactor) in NEMA Type [_____] enclosure shall be provided. Mainline
disconnect shall be controlled by a control circuit so that all crane
motions will be stopped upon mainline undervoltage, overload, control
circuit fuse failure, or operation of POWER OFF pushbutton. Mainline
disconnect shall be equipped with energy isolating devices designed to
accept lockout devices.
2.4.10.2
Isolation Transformer
**************************************************************************
NOTE: Specify an isolation transformer and surge
protection to protect electronics from external
faults. Recommended for dc static control systems.
Applicable to ac power supplied systems only.
**************************************************************************
SECTION 14630A
Page 42
Previous Page
