E C H O - P G V E R S I O N E N 1
3
Hazards identification
The cage nit is powered by 12VDC NiMH battery. It sho ld be taken to consider that
in a f lly charged battery d ring setting p might be done by accident shorting pins
which may ca se battery leakage, overheat and in a conseq ence may ca se inj ries
(s ch as b rns). The battery sho ld be charged only by the original charger ŁAE-S3.
Used batteries sho ld not be thrown away in the trash. The cage nit sends once per
min te to the headframe nit control signal, accompanied by a beep. The PAK cable
has incorporated connection between pins 4 and 7 for a thorization higher speed. This
cable sho ld be installed in safe place for raise and lower with high speed.
Headframe nit is s pplied from 230 VAC network and sho ld be connected to a wall
o tlet with a protective pin (this applies to primary and reserve power s pply). The
casing of headframe nit is made of sheet steel, so it sho ld be gro nded. Opening the
ho sing is allowed only after disconnect from the power. The "
" sign on the
inp t/o tp t block means that inside can be dangero s voltage from the shaft system.
Headframe nit sho ld be installed in safe place i.e. not in EX zone. Power- p seq ence
is as follows: first main power and second reserve power. In other case there might be
occ r an electrical arc on contacts of power s pply switch relay
1. Use and range of application
Device of wireless shaft communication ECHO-PG version EN1 is intended to use in
shaft sinking to communicate between crew in platform and hoist operator in mine shaft.
Whole communication system consists of two sets of components named as the headframe
unit and the cage unit. Communication between these units is realized by means of hoisting
ropes, which are carriers of the electromagnetic wave.
The basic advantages of this system are following:
- two-way semiduplex audio communication,
- sending remote control signals from platform to a hoist machine,
- receiving information signals from a hoist machine to platform.
The cage unit is made as intrinsically safe device group I, category M1.
The principle of working of this device is utilization rope as carrier to move electromagnetic
waves. Carrier is created by:
- guiderope and earth,
- additional rope and earth.
Electric continuity of such loop is the main condition of correct work of device.
Electromagnetic wave is generated to the loop and received from it by inductive couplers.
There are fixed two inductive couplers (transmitter and receiver) in headframe in such way,
that headrope crosses by their center. Over conveyance there are fixed another pair of
couplers. Headframe unit sends signal by inductive coupler (transmitter) to rope and cage unit
receive signals from rope by other inductive coupler (receiver). Communication from cage
unit to headframe unit is performed in the same way by pair of couplers fixed over
conveyance. Only one device can work in one loop, which means that one headframe unit can
only communicate with one cage unit. The device has four frequency version:
A, B, C, D thanks to which, it is possible to use four system in one shaft.
