Technical features of DAP programmable cabinet

Supply voltages: 110VAC

Output voltages : +24VCC

Input voltage variation range

-long-lasting: ± 10%

-short-lasting: 1.5s; - 30% ... + 20%

Frequency variation range:

-long-lasting: 60Hz ±5%

-short-lasting: 5s; 50Hz ± 1%

Operational temperature: 0⁰C . +60⁰C

Storage temperature: -25⁰C . +70⁰C

Maximum RH: 80% (for an ambient temperature of 20^oC).

Maximum altitude: 1000m (above sea level)

Driller console/local pumps panel Ex zone 2 ; 22/ naval

Instructions:

- START, REVERSE, STOP DC motors

- START, STOP supercharging pumps.

- MONITORING DIESEL-GENERATOR SET

AUTOMATIC PROGRAMMABLE CABINET - DAP

Contains the programmable automated, PLC device, relays, automatic fuses, supply sources; this cabinet is the interface, the execution element between the driller console and the drilling plant. In the upper part of the counter-panel the supply sources are placed for : G1 and G2 for supplying digital input/output modules, G3 for supplying the operator's panel, as well as monitoring and supplying chief driller console operator's panel, G5 pedal controller supply source.

The hardware support of the command and control system consists in a programmable automated device in the S300-Simatic range, manufactured by SIEMENS. The programmable automated device comprises the following: U1- 110VAC/24VDC supply source, U2-central unit CPU313C-2DP with integrated PROFIBUS communications processor, U3, U4-module of 16 digital inputs/outputs, U5-module of 32 digital inputs and U6-module of analogical inputs.

Digital inputs and outputs are used for interfacing the actuation equipment with the rest of the drilling plant (conditions for starting, stopping, failure, interlocking, etc.)

Analogical inputs are used for current acquisition for every DC motor. This current is serially sent to the chief driller console (PROFIBUS communication).

A PROFIBUS DP-type communication bus is configured. The command system-S300 (defined as master) communicates with the chief driller's panel (SLAVE), with the operator's panel TP270 (fitted on DAP door) as well as with the S200 programmable automated device (used for controlling DGs), on this data bus.

PROFIBUS communication monitoring LEDs BF and SF are placed on the front side of the central unit CPU313C-2DP. If the automated device S200 is not supplied, LED BF is lit (red) while LED SF is blinking in red. If LED SF is off and LED BF is lit, then the selector in CPU 313C-2DP is switched in the STOP position for a few seconds and then it is brought back to RUN position. LED BF shall go off.

A charging rectifier G5 is placed in the lower side of the counter-panel for the supply accumulators of diesel-generator protections. Accumulators are fitted in the lower side of the cabinet. Source G5 features a monitor displaying the load current and load voltage (adjustable from the potentiometer placed under same). A minimum and maximum voltage relay monitors the battery voltage. Any off-limits voltage deviation (< 20 VDC, > 30 VDC) is signaled by the red lamp placed on cabinet door.

The following are mounted on cabinet door: a green voltage presence lamp, a rectifier (G5) failure red lamp, 3 selectors S1-hoist lockout, S2-mud pump 1 lockout and S3-mud pump 2 lockout. An operator's panel TOUCH SCREEN TP 270 10 '' is door-fitted. This operator's panel is intended for monitoring the electric parameters of the drilling plant. It monitors the functioning of DC motors, auxiliary consumers and diesel generators. Any failure or event occurred is displayed on this panel.

Hoist and pumps lockout selectors are intended to lock out these machines from working. In fact, they block the ventilation and lubrication starters of each piece of machinery. Deactivation of working machinery is adequately signaled on the operator's (DW LOCK, MP1 LOCK, MP2 LOCK).

Each piece of machinery is allotted a display space where information are viewed concerning the operation of said machine, e.g. hoist:

  -if the motor is stopped, the motor symbol is displayed on a white, transparent background. If the motor is started, the motor symbol is colored in green. After the starting command the ventilation confirmation signal appears: 

Converter type, MASTER or SLAVE, is signaled. SLAVE does not work independently, yet in consonance with the MASTER. If the two converters are configured as MASTER, the converters cannot be started simultaneously, yet one converter a time! In other words, operation of one converter excludes operation of the other. Confirmation of lubrication pump coupling is also viewed

Converters could be controlled locally (from the door of each converter) of from the chief driller's console (for pumps is also the selection between driller's console and Pump room)

The location where motors could be controlled from (LOCAL, DRILLER or MP ROOM) is specified below each motor symbol.

The selector placed on the actuation cabinet door takes precedence (regardless on the selector position on the driller's console, command shall be transferred to the cabinet should cabinet selector is on position LOCAL).

The selected rotation direction is viewed (green arrow downwards or upwards)

When the potentiometer is removed from the zero position (hoist only) the symbol is shown on display (the motor starts turning).

Any failure message is viewed in the lower right side. To restart the equipment subsequent to a failure message one must effect the RESET operation (button RESET on TP 270 or button ACK on the chief driller's console).

Examples of messages and their meaning

DWA  FAULT=Hoist actuating equipment, motor A failed.

DWA COOLING FAULT=Hoist motor A is not ventilated (no ventilation relay confirmation, no ventilation starter coupling confirmation)

AUTOMATIC FEED OF THE BIT=Automatic feed starter coupled -AFB

DW LOCK=Starting of hoist equipment is locked out (lubrication and ventilation starters locked, selector S1)

NO LUBE OIL PUMP DW=No hoist equipment lubrication (no hoist lubrication pump starter coupling confirmation)

WARNING TTA1 OVERTEMPERATURE=TTA1 transformer windings temperature has overcome the alarm threshold.

WARNING TTA1 OVERTEMPERATURE= TTA2 transformer windings temperature has overcome the alarm threshold.

These messages repeat themselves for every hoist and pumps motor.

If one of the starting conditions (ventilation or lubrication) is not met, the equipment will not start and the adequate message is shown on the display ( Ex.  DWA -NO LUBE OIL PUMP)

The automatic feed (AFB) and the overcharging pumps (SCP1,2) operation is monitored.

Operation of Diesel-Generator groups is monitored and displayed on the right side (group stopped, started, bar coupled, failure)

The largest blind power (the largest of QG1, QG2, QG3) and the largest active power (the largest of PG1, PG2, PG3) are displayed as percentages. Should the power decrease below 95% , is value is displayed in green, while if increasing over 95%, the value is displayed in red.

Currents for each motor could be viewed if pressing the MOTOR CURRENT key:

Press BACK to return to the main screen.

The main element of chief driller's console-PS is the operator's panel OP270 mounted on a 600x600x250 stainless steel box. This console is also featuring an emergency E-STOP button that shuts down Diesel-Generator groups and a selector S1 switching control between chief driller and local mud pumps consoles. The protection class of operator's panel is IP65.

The connection between SDACRN and chief driller's console-PS is as follows : a 1,5x12 cable connected to driller's console by means of a connection box in construction Ex, mounted inside driller's console, and a PROFIBUS communication cable PROFIBUS (mauve-colored) that is connected by means of couples Ex. The pedal controller is also connected to driller's console by means of couples Ex.

At the other end (of SDACRN), cables are connected as follows: PROFIBUS cable is connected in the PSC couple, and the 1.5x12 cable is connected to the couple

The operator's panel screen displays same information as on SDACRN screen, yet in another configuration. Moreover, the starting, stopping and reversing commands can be issued here.

The main screen is displaying currents (as a percentage) for each engine (Hoist-100%=1500A, Mud pumps-100%=1200A). In order to view the moor currents expressed in amperes, press key F18.

The start/stop command is assigned a single key per engine, which key is being specified on the display. In order to start an engine press the adequate key once. If all conditions are met, the engine started symbol appears, i.e. (induced converter power contactor coupling confirmation). If all engine starting conditions are not met, a message/messages shall be displayed indicating the reasons why that engine did not start. In order to stop the engine press the same key once. 

Any command issued from the drill plant operator's panel is sent via a PROFIBUS-type network to the programmable automated device that processes the command and, according to certain conditions, carries it out or not. Upon issue of engine start command, the programmable automated device executes the prepare command to the matching converter and awaits the prepare operation confirmation for a couple of seconds. Should the prepare operation confirm, the programmable automated device commands startup of respective engine. After the motor start key is pressed, the ventilation presence symbol appears first and the motor symbol after a few seconds (motor switch coupling confirmation). Upon stopping, the motor symbol goes off first and, after a few seconds, the ventilation presence also goes off (ventilation stopping). If the ventilation presence symbol does not go off in a couple of minutes, the wind relay is jammed or the fan did not stop and due action must be taken!!!.

Commands are issued by pressing the adequate key once:

F1=Start/stop DWA

F2=Start/stop DWB

F3=Reverse sense DW

F4=Start/stop AFB

F5=Start/stop MP11

F6=Start/stop MP12

F7=Start/stop MP21

F8=Start/stop MP22

F9=Start SCP1

F10=Start SCP2

F11=Stop SCP1

F12=Stop SCP2

F13=Increase speed MP1

F14= Decrease speed MP1

F15=Increase speed MP2

F16= Decrease speed MP2

F18=View motors currents

F19= Return to main screen

There is an interlock between the hoist and automatic feed (AFB). If the hoist is on, AFB cannot be started. The symbol is shown over the AFB symbol. This also happens upon starting the automatic feed -AFB; starting of hoist is locked out.

The engine started symbol is shown on the display when the converter power supply symbol is coupled (switch coupling confirmation). The engine ventilation symbol is displayed when wind relay confirmation is received. If the symbol is black instead of green, then ventilation starter coupling confirmation has been received, yet there is no wind relay confirmation.

If the motor is no longer ventilated or the machine (mud pumps or hoist) no longer have lubrication during operation, the engine is stopped and the adequate failure message is displayed.

Mud pumps could also be started from the mud pumps local consoles.

A startup confirmation lamp, a startup button and a shutdown button (with lockout in this position) are door-fitted for every motor, as well as an increase speed or decrease speed button for each pump. These consoles also allow startup and shutdown of supercharging pumps.

External connections of the PLC cabinet, their function and matching to inputs and outputs of the programmable device are defined below.

External/internal PLC connections

XO1

XO2

XO3

XO4

XO5

XO6

XI1-relay inputs

XI2-relay inputs

XI3

XI4

XI5

XI6

XI7

XI8- MP22

XI9- analogical inputs

Output connectors