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Service

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anual

Servo ventilator 900 C/D/e

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Содержание Servo ventilator 900 C

Страница 1: ...Service Manual servo ventilator 900 C D E...

Страница 2: ...r further information We reserve the right to modify products without amending this document or advising the user We recommend using MAQUET authorized personnel for all service and repairs and the use...

Страница 3: ...hure Servo Ventilator Concept Application Brochures Intensive Care Anesthesia Transportation Operating Manual Brief Operating Instructions Training Instructions Front Panel Flip chart Advisory Booklet...

Страница 4: ...ue to the electronic unit The servo valves are used as CONTROLLING ELE MENTS for the control of inspiratory and expiratory gas conduction The electronic unit comprises three controlling systems two fo...

Страница 5: ...sation for small long time error in the ACTUAL VALUE D action gives a speed up positioning reaction at fast changes in the ACTUAL VALUE The actual value from the TRANSDUCER in use is compared with the...

Страница 6: ...ration Timing Reference timing pulses START SIMV CYCLE CLOCK INSP TIME and EXP TIME are generated in this main block The TIMING gets some command variables from the front panel settings Monitoring The...

Страница 7: ...7 Principle diagram Not valid for SV 900 E Not valid for SV 900 D...

Страница 8: ...s exceeds approximately 120 cm H2 O The airway pressure is measured The gas conduction from the patient is regulated From patient The gas flow from the patient is measured To patient The gas is filter...

Страница 9: ...ass a one way valve an O2 cell and a bacteria filter The bacteria filter remo ves 99 998 of all particles down to a size of 0 3 mic rons When an anesthesia vaporizer is used the gas supply unit has a...

Страница 10: ...The lower plate is movable and spring tensioned The upper plate acts as a lid which is firmly positioned above the bellows A double coil spring set is arranged to give a constant pressure to the bell...

Страница 11: ...that during inspiration gas is continuously fed to the bellows Thus a constant gas volume is kept in the bellows when using the high pressure inlet When a constant gas flow from a flowmeter is suppli...

Страница 12: ...ortional to the relative O2 CON CENTRATION For each O2 cell the variable output will stay at a fairly constant level during the life time of the cell approximately 800 000 xhours The output voltage le...

Страница 13: ...s see corresponding Operating Manual The relief safety valve may be opened in two ways Firstly if the bellows tend to overfill a metal rod will push the lever to let out excess volume surplus func tio...

Страница 14: ...Wheatstone bridge is converted to a correspond ing signal voltage The output signal from the flow preamplifier is a non linear function of the flow The flow preamplifier signals are linearized on PC b...

Страница 15: ...NTERFACE board PC 765 The output signal voltage from the pressure amplifier is proportional to the gas pressure When replacing the pressure transducers the preamplifier zero and gain have to be adjust...

Страница 16: ...ure the step motor will always end up with the inspiratory valve in fully opened position The maximum speed of the step motor is about 480 steps second and the time elapsing from fully open to fully c...

Страница 17: ...that the patient can always exhale through the ventilator at voltage failure The expiratory valve is controlled by the signals from the electronic unit At a PEEP setting the in formation from the pres...

Страница 18: ...OR and its 6 8V REGULATOR MONITOR are also included on this PC board The CALIBRATION POTENTIOMETERS and the CALIBRATION SWITCH are situated on this PC board On failure in the 6 8V REGULATOR indicated...

Страница 19: ...tronic circuits for regulation and monitoring A general description is found in chapter Introduction and the following chapter comprises a detailed description of the PC boards included in the electro...

Страница 20: ...20 Electronic unit Reference level generation General The front panel settings are converted to reference level signals for the regulating systems...

Страница 21: ...GAS CHANGE LO comes from the front panel pushbutton GAS CHANGE As long as the pushbutton is depressed a reference value V17 8 via V2 corresponding to a constant inspiratory pressure level 20 cm H2 O w...

Страница 22: ...the first two thirds of the ispiration time During the remainder of the ispiration time the reference signal decreases See the diagram in which the corresponding CONSTANT FLOW PATTERN reference signa...

Страница 23: ...eneral The regulation of inspiration is done by means of the FLOW or PRESSURE SERVO LOOP depending on selected mode The actual values for the controllers in these loops come either from the inspirator...

Страница 24: ...24 Electronic unit Regulation of inspiration...

Страница 25: ...INSP MINUTE VOLUME according to PRESET INSP MIN VOL l min setting During VOL CONTR and VOL CONTR SIGH modes the desired MINUTE VOLUME will thus be achieved within approximately 8 breaths from each cha...

Страница 26: ...ng INSPIRATION Mid insp time pulse PC board no 5 The positive front edge of the pulse generated in SECOND HALF INSP TIME will trigger a pulse V1 V16 which is fed to INSP PRESSURE LEVEL COMPENSATOR Sta...

Страница 27: ...ard no 6 The freqency of this oscillator is selected R92 within 250 400 Hz Electronic unit Regulation of inspiration End position protector PC board no 6 The purpose of the END POSITION PROTECTOR V27...

Страница 28: ...re set on the front panel as percentages of the complete respiratory cycle The EXP TIME represents the remainder of the cycle to 100 equal to 100 clock pulses The intervals are controlled by a clock p...

Страница 29: ...presents one or more of the following 13 output signals from the MODE CONTROL BLOCK PRESS REG INSP TIME PRESS REG CONDITION PRESS SUPP MODE SET LO PRESS CONTR MODE SET LO VOL SIGH MODE SET LO VOL CONT...

Страница 30: ...INSP V8 4 10 and COUNTER RESET via R76 The MASTER START INSP V7 10 signal is used ex ternally when two ventilators are synchronized Insp time expo time multiplexer PC board no 3 This block is control...

Страница 31: ...ME EXP TIME GENERATOR criteria no 2 This signal makes INSP TIME end even if the peak insp flow is lower than 0 1 l s See table on page 32 Man vent timing PC board no 7 This stage receives the AIRWAY P...

Страница 32: ...regulated 2 INSP VALVE CLOSED PE 3 cm H2 O PEEP LEVEL inspiration INSP PRESS LEVEL above PEEP during SIMV Preset PEEP and INSP PRESS LEVEL above PEEP PRESS 3 PE or PI UPPER PRESS LIMIT SUPPORT Preset...

Страница 33: ...be selec ted for direct read out The values are continuously compared with preset alarm limits and if any of these limits is exceeded a corresponding visual and audible alarm is activated As described...

Страница 34: ...34 Electronic unit Monitoring...

Страница 35: ...T V10 L37 L38 which will be active HI if the front panel knob LOWER ALARM LIMIT for EXPIRED MINUTE VOLUME is close to its left counter clockwise end position out of scale and or the front panel knob U...

Страница 36: ...APNEA LO activates the red flashing alarm lamp APNEA ALARM on the front panel and the AUDIBLE ALARM via the block ALARM LAMP DRIVER Timing supply voltage monitoring PC board no 9 In case of TIMING FAI...

Страница 37: ...I exceeds the desired inspiratory pressure value by more than 30 cm H2 O The output signal HIGH PRESSURE STOP INSP will initiate a condition to stop the pressure regulated inspiration and start the e...

Страница 38: ...each inspiration Integrator E PC board no 7 The EXP TIDAL VOLUME is an integration of the EXP FLOW signal during each expiration Ripple reduction PC board no 7 This is a special low pass filter creati...

Страница 39: ...piration General The pressure signal from the pressure transducer in the expiratory channel is compared with the pre set PEEP level and a difference results in a correction signal to the expiratory va...

Страница 40: ...from the PEEP ERROR CALCULATOR to a pulse sequence with a fixed frequency Pull magnet driver PC board no 4 The driver stage converts the pulses into a current through the pull magnet coil The pull mag...

Страница 41: ...ely activated Transformer Power supply unit The voltage can be selected internally at the trans former mains input There are fuses for the trans former externally in fuse holder and internally three t...

Страница 42: ...on sockets are all except the supply voltages buffe red for security External control Rear panel The 25 pole socket marked CONTROL TERMINAL is in tended for control of some ventilator functions for in...

Страница 43: ...trol of some functions as well as output signals The pins 1 25 of the connector are numbered 201 225 in the diagrams Inputs Pin 7 SLAVE START INSP 0V 5V DIGITAL CONTROL Pin 8 RESP RATE U 23 breaths mi...

Страница 44: ...44 Pneumatic unit Electronic unit Disassembling...

Страница 45: ...45 Step motor assembly and pull magnet Disassembling...

Страница 46: ...ows Connect the device to the high pressure gas supply Push down the pressure plate and release the pres sure until you can clearly hear that the controlled inlet valve opens With the valve in the nea...

Страница 47: ...it to 1 0 and lock the scale in this position Apply glue Mega Firm or similar to the guide hole in the front panel Carefully put the scale unit in position without allowing the potentiometer shaft to...

Страница 48: ...lerance Scale Check DVM reading Tolerance number reading setting point R1 0 938V 0 926 0 950V 60 100 2 187V 2 162 2 212V R2 0 313V 0 301 0 325V 20 60 1 563V 1 539 1 587V R3 0 652V 0 627 0 677V 20 70 2...

Страница 49: ...g voltage supply etc and then the faulty part Always start the troubleshooting in the pneu matic unit since malfunctions very rarely occur in the electronic unit Troubleshooting If you use the block d...

Страница 50: ...ure transducer is clogged The pressure transducer is defective Fault in AIRWAY PRESSURE AMPLIFIER PC board 766 and lor the wiring to the AIRWAY PRESSURE meter is defective Action Check the opening pos...

Страница 51: ...ducer or wire mesh net Replace the transducer and calibrate the ventilator as described in the Operating Manual Replace the potentiometer Replace the board in question Replace PC board 759 Replace the...

Страница 52: ...27 Flow averager Monitoring 7 PC 761 38 Flow pattern selection Regulation of inspiration 25 Flow transducer E I Pneumatic unit 18 Gas change press ref level Reference level 5 PC 759 21 Gas supply mon...

Страница 53: ...Monitoring 5 PC 759 26 Set minute volume alarm limits Monitoring 6 PC 760 35 Set O2 alarm limits Regulation of inspiration 9 PC 763 35 Sigh counter Timing 3 PC 757 30 SIMV pulse generator Timing 3 PC...

Страница 54: ...Electronic function block diagram...

Страница 55: ...evention medical beds therapeutic surfaces and diagnostics GETINGE for infection control and prevention within healthcare and life science and MAQUET for Surgical Workplaces Cardiovascular and Critica...

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