Pit Shafts Signal System MASS is designed for coordination of process personnel actions and control of hoisting unit during trips of men, cargo and oversized equipment, as well as during examinations, inspections and overhauls in the pit shafts and head frame rig, and is also used in man, man-cargo and cargo hoisting units of mines (pits).

Pit Shafts Signal System MASS has permission from the Russian Federal Service for Ecological, Technological and Nuclear Supervision for use in mines and coal mines, including dangerous mines due to risks of gas and dust.

Pit Shafts Signal System MASS complies with the Technical Regulations of the Customs Union ТР ТС 012/2011 "On the safety of equipment for use in potentially explosive atmospheres" (Certificate of Compliance number BY/112 02.01. 103 00026).

PIT SHAFTS SIGNAL SYSTEM PROVIDES:

• operational light (accompanied by acoustic) alarm;
• signaling by cager - signal tender on the landing all working places the hoisting unit operation modes “Men”, “Cargo”’ “Oversized item”;
• sending operation mode signal “Inspection” by hoisting unit operator;
• two landings version provides for selection by signal tender – cager on the landing of the active landing with this information displayed on his working place and that of the hoisting unit operator;
• selection by cager - signal tender being on the landing of the cage movement address: “Horizon “xxx m” (up to seven horizons) with this information displayed on his working place and that of the hoisting unit operator, selected shaft horizon;
• indication of the precise cage stop on the landing and selected horizon with this information displayed on his working places of the selected horizon, landing and the hoisting unit operator;
• automatic unlock of the door interlock upon actuation of the sensor of cage precise stop on the landing and selected horizon;
• possibility to send enabling signals to actuate mechanisms used in the hoisting unit;
• sending by cager - signal tender being on the landing movement commands ‘Up”, “Down”, “Slowly up”, “Slowly down”, “Stop” to hoisting unit operator’s cage and to horizons;
• sending by cagers being on horizons movement commands ‘Up”, “Down”, “Slowly up”, “Slowly down”, “Stop” to the landing;
• sending by cager – signal tender being on the landing and cagers being on horizons to all working places the signal “Emergency stop”, and display of the signal “Emergency stop” in the form of red blinking signal (red inscription “Emergency stop” on the board of hoisting unit operator’s SSP), and interrupted acoustic alarm having tonality different from the totality of the signal that accompanies signal “Stop”;
• possibility to cancel the signal only from the place from which it was sent;
• sending from the landing to operator’s cabin the signal about position of fire protection folding doors and display of this information in the operator’s cabin and on the landing;
• follow-up of movement commands ‘Up”, “Down”, “Slowly up”, “Slowly down” with enabling signal “Movement” to the hoisting unit movement with display of this signal on the working place of cager – signal tender;
• sending discrete commands “Emergency stop”, “Stop”, “Movement”, “Stop”, “Cams”, “Tilting landing”, “Men”, “Cargo”, “Oversized item”, “Inspection”, “Braking ropes” by means of relays installed in the CCS (central control station).

IN ALL MODES (EXCEPT FOR THE MODE “INSPECTION) PIT SHAFTS SIGNAL SYSTEM PROVIDES THE FOLLOWING PROTECTIONS AND INTERLOCKS:

• impossibility to start up the hoisting unit if switches of landings selection are put in different positions;
• impossibility to start up the hoisting unit until movement command from cager on the landing is received;
• impossibility to send movement commands from non-active (unselected) horizon (except for command “Stop”);
• impossibility to send movement commands from selected horizon when there is no cage in the range of precise stop sensor, except for command ‘Stop”;
• impossibility to send any signals after signal “Emergency stop” is given until it is cleared;
• impossibility to send the following movement command without clearing the preceding one with signal “Stop”;
• impossibility to send movement commands with fire protection folding doors down;
• impossibility to send movement commands with tilting landing induced;
• impossibility to send movement commands with faulty sensor circuits “Cams”, “Tilting landings”, “Folding doors”, “Braking ropes”, “Precise stop sensor”,
• impossibility to send two and more movement commands simultaneously;
• impossibility to unlock door interlock on non-active horizons;
• automatic formation of command “Stop” when trying to change operation mode (‘Men”, “Cargo”, “Oversized items”) during cage movement. In this case the preceding movement command is cleared by command “Stop”;
• automatic formation of command “Stop” with faulty sensor circuits controlling braking ropes’ state. In this case the preceding movement command sent from any horizon is cleared by command “Stop”;
• automatic formation of command “Stop if upon expiration of holding time of relay “Movement” (3…5 s) the hoisting unit is not actuated;
• automatic formation of command “Stop upon loss of communication with any device of the active landing or active horizon, as well as upon loss of communication with data transmission unit (DTU) or data acquisition device on the state of sensors for control of the position of shaft grating, cams, tilting landings, braking ropes of non-active landing or horizon.

Pit shafts signal systemdisplays text message on the SSP of hoisting unit operator on the cause of cancelling sent movement command or automatic formation of command “Stop”, as well as address of the working place where this event occurred.

Mode “Diagnostics” accessed from SSP of hoisting unit operator allows to monitor the state of all sensors included in the configuration, availability of communication with devices and other hardware faults.

To control trip of the oversized equipment remote control panel can be installed in the direct proximity to shaft collar.

WHEN CONNECTED TO PC PIT SHAFTS SIGNAL SYSTEM PROVIDES:

• logging the hoisting unit operation with possibility to archive address of the given command, date, time, working place from where it was sent;
• possibility to review and print out event log;
• display of the current state of controls and sensors of cagers – signal tenders and cagers’ work places on PC mnemonics with details for each work place;
• installation of reserve copy of software in the controller.

PRINCIPAL ADVANTAGES OF PIT SHAFTS SIGNAL SYSTEMS MANUFACTURED BY JSC “THE INSTITUTE OF MINING ELECTRICAL ENGINEERING AND AUTOMATION”

1.      The use of intrinsically safe interface RS 485 as a communication line between shaft work places and machine hall relieves the necessity of laying multi-wire cable for signals transmission along the shaft. Two pairs of conductors are sufficient to set up communication line and safety loop circuit.

2.      Low supply voltage of stabilized power sources (127 V) enhance electrical safety of hardware.

3.      All cabinets on the landing and horizons are powered with stabilized intrinsically safe voltage of 12 V DC.

4.      Only one source of power for pit shafts signal system hardware on each work place.

5.      Spaced-apart layout of pit shafts signalsystemhardware allows reducing required footprint for cabinets’ installation on work place.

6.      In the mode “Cargo” pit shafts signal systemequipment allows operation with exposed cams only on selected (active) work place.

7.       In the mode “Oversized item” pit shafts signal system equipment allows operation with open doors only on selected (active) work place.

8.       Pit shafts signal system equipment allows for operation with two types of chairs (cams and tilting platforms) installed in the shaft, with each type provided with its own interlock.

9.       Pit shafts signal systemequipment allows for diagnostics of states of all devices included in the configuration, and states of all connected sensors directly from the work place of hoisting unit operator.

10.     When connected to PS the pit shafts signal system hardware can log events allowing to analyze operation of the equipment and maintenance personnel.

MAIN TECHNICAL DATA:

maximum number of landing sites, pc	2
maximum number of horizons (work places), pc	12
permissible fluctuations of main supply voltage from 85 to 115% of nominal value
Marking performance by GOST and GOST 30852.0 51330.0:
power unit	PО Ex ia I Ma X
central station	[Exib] I
cabinets installed on horizons and landing sites	PО Ex ia I
Protection level of devices shells by GOST 14254:
cabinets installed on horizons and landing sites	IP67
operator's screen	IP40
Specifications of data channels between devices:
cable type	shielded twisted pair cable
number of cores	2 pc
cross-section, not less than	0,5 mm2
physical protocol	RS485

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