Do you have a question about the ZT55-ZT75-ZT90 and is the answer not in the manual?
Questions and answers
Еловских Валерий
May 28, 2025
Причины перегрев 1 ступени компрессор ZT 75. Температура поднимается до 225гр и уходит в аварию. На улице 32гр плюс. Компрессор стоит в помещении.
2 comments:
Mr. Anderson
May 28, 2025
Possible causes of overheating in the first stage of the Atlas Copco ZT 75 compressor, with temperatures reaching 225 degrees, include:
1. Blocked or insufficient cooling water flow, especially in open or closed cooling systems. 2. High ambient temperature exceeding 40°C. 3. Malfunctioning temperature sensors. 4. Faulty motor leading to overload. 5. Thermistor protection failure. 6. Inadequate ventilation or fan motor overload. 7. Dirty or clogged intercooler.
These issues can cause the compressor to exceed programmed shut-down temperature levels.
This answer is automatically generated
Еловских Валерий
May 28, 2025
@Mr. Anderson Компрессор безмасляный, охлождение у него воздушное.
Еловских Валерий
July 18, 2025
Добрый день. На панельке высветился значок красный и надпись ТРЕВОГА КОНВЕРТЕРА компрессор ZT90 безмасляный. В данный момент работает ZT75 без частотного регулирования а ZT90 стоит в ожидании когда если давление снизится на ZT75 то он включится в работу автоматически. Вопрос про ZT90 , почему высветился статус ТРЕВОГА КОНВЕРТЕРА? Где искать причину, что сделать? Спасибо за ответ.
Summary of Contents for Atlas Copco ZT55-ZT75-ZT90
Page 1
ZR55-ZR75-ZR90 Instruction book From following serial number onwards: AIF-077 519 Copyright 2003, Atlas Copco Airpower n.v., Antwerp, Belgium. Any unauthorized use or copying of the contents or any part thereof is prohibited. This applies in particular to trademarks, model denominations, part numbers and drawings.
Page 2
Follow all applicable safety precautions, amongst others those mentioned in this book. Repairs must be carried out by trained personnel from Atlas Copco who can also be contacted for any further information. In all correspondence mention the type and the serial number, shown on the data plate.
Instruction book 1 LEADING PARTICULARS......................... 5 1.1 General description..........................5 1.2 Air flow (Figs. 1.6 and 1.7)........................ 10 1.3 Condensate drain system (Figs. 1.6, 1.7 and 1.8)................11 1.3.1 Description ..........................11 1.3.2 Testing the electronic water drain ....................11 1.4 Oil system ............................
Page 4
Instruction book 7.1 Readings on display (Fig. 1.12) ......................56 7.2 Settings of safety valves ........................56 7.3 Settings of circuit breakers - fuses..................... 56 7.4 Compressor specifications......................... 58 7.4.1 Reference conditions ........................58 7.4.2 Limitations ........................... 58 7.4.3 Specific data, ZR - 7.5 bar - 50Hz....................58 7.4.4 Specific data, ZR - 8.6 bar - 50Hz....................
Instruction book 1 LEADING PARTICULARS 1.1 General description ZR55-ZR75-ZR90 and ZT55-ZT75-ZT90 are two-stage screw compressors, driven by an electric motor. The compressors deliver oil-free, pulsation-free air. ZR compressors are water-cooled, whereas ZT compressors are air-cooled. ZR/ZT Full-Feature compressors are additionally provided with an air dryer which removes moisture from compressed air.
Page 6
Instruction book Air filter Air outlet Silencer Aftercooler Oil cooler Daa Automatic condensate outlet, aftercooler Automatic condensate outlet, intercooler Low-pressure compressor element Drive motor SVh High-pressure safety valve Low-pressure safety valve Emergency stop button Load/no-load valve Silencer Cooling water inlet WO Cooling water outlet Loading solenoid valve Flange, connection to MD dryer...
Page 7
Instruction book Air filter By-pass valve Oil cooler Oil drain valve, gear casing EWDa Electronic water drain, aftercooler EWDi Electronic water drain, intercooler Moisture trap, aftercooler Moisture trap, intercooler Drive motor Oil filter Oil level sight-glass High-pressure safety valve Low-pressure safety valve Loading solenoid valve Fig.
Page 8
Instruction book Air filter Aftercooler Intercooler Low-pressure compressor element Load/no-load valve Loading solenoid valve Dryer Throttle valve, regeneration air inlet Electronic water drains (EWD) Rotor drive assembly Fig. 1.3 Rear view, ZR90 Full-Feature 2920 1452 02...
Page 9
Instruction book Air filter By-pass valve Pre-aftercooler Aftercooler Intercooler Oil cooler High-pressure compressor element Low-pressure compressor element EWDi Electronic water drain, intercooler Oil filler cap Moisture trap, intercooler Drive motor Low-pressure safety valve Loading solenoid valve Flange, moisture trap intercooler Fig.
Instruction book Full-Feature compressors Air drawn through filter (AF) is compressed in low-pressure compressor element (El) and discharged to intercooler (Ci). The cooled air is further compressed in high-pressure compressor element (Eh) and discharged through silencer (AS) and aftercooler(s) (Ca for ZR and Ca1 and Ca2 for ZT) towards the air dryer.
Page 12
Instruction book Checking the alarm signal Press the test button for at least 1 minute. Check that the alarm LED flashes. Release the test button. 2920 1452 02...
Instruction book Fig. 1.10 Control panel, electronic water drain 1.4 Oil system ZR compressors (Fig. 1.6) Oil is circulated by pump (OP) from the sump of the gear casing through cooler (Co) and filter (OF) towards the bearings and timing gears. Valve (BV-Fig. 1.2) opens if the oil pressure should rise above a given value.
Instruction book F3/4 Circuit breakers, control circuit Circuit breaker for electronically controlled automatic condensate drains Overload relay, drive motor Auxiliary relay, loading Line contactor Star contactor Delta contactor Circuit breaker, control circuit Main transformer Transformer, control circuit Power supply terminals 1X4/5/6/7 Terminal strips Fig.
The regulator has a built-in function to automatically restart the compressor when the voltage is restored after voltage failure. For compressors leaving the factory, this function is made inactive. If desired, the function can be activated. Consult Atlas Copco. Warning If activated and provided the module was in the automatic operation mode, the compressor will automatically restart if the supply voltage to the module is restored within a programmed time period.
Instruction book 1.8 Control panel Fig. 1.12 Control panel Ref. Designation Function Start button Push button to start the compressor. LED (8) lights up indicating that the Elektronikon regulator is operative. Display Indicates messages concerning the compressor operating condition, a service need or a fault.
To cancel a programmed setting when programming parameters Delete To delete compressor start/stop commands Help To find the Atlas Copco internet address Limits To show limits for a programmable setting Mainscreen To return from a menu to the main screen (Fig. 1.13) Menu Starting from the main screen (Fig.
Page 22
Instruction book Warning Before connecting external equipment, stop the compressor and apply all safety precautions as mentioned in section 4. 2920 1452 02...
Instruction book Text on Figs. 2.1up to 2.4 Voltage supply entry Compressed air outlet Cooling air inlet Opening for transportation 4 slotted holes for horizontally pulling out of container only Cooling air outlet Hole pattern ducting Automatic drain, aftercooler Automatic drain, intercooler (10) Compressed air outlet, compensator (11) Mass (12) Water in/out, compensator...
Page 28
If cooling air ducts are installed, the maximum allowable pressure drop over the ducts is 30 Pa. Common ducting for several compressors is not allowed. For detailed information regarding ventilation proposals, contact your Atlas Copco Service Centre. Lay out the drain piping from automatic condensate outlets (EWD) towards the condensate collector.
Instruction book Text on Figs. 2.5 up to 2.8 (1) Minimum free area (2) Ventilation proposals 2.3 Electric cables Mains + earth cable 50Hz IEC Compressor Voltage Supply cables ZR/ZT55 200V 2x (3 x 70 + 35) mm² ZR/ZT55 230V 2x (3 x 70 + 35) mm²...
Page 34
Instruction book 60Hz IEC Compressor Voltage Supply cables ZR/ZT75 200V 2x (3 x 120 + 70) mm² ZR/ZT75 220-230V 2x (3 x 95 + 50) mm² ZR/ZT75 380V 3 x 120 + 70 mm² ZR/ZT75 440-460V 3 x 95 + 50 mm² ZR/ZT75 575V 3 x 70 + 25 mm²...
Page 35
Instruction book Fig. 2.9 Electrical connections Text on Fig. 2.9 (1) Customer's installation (2) Compressor motor, 440-460V 60Hz (3) Compressor motor, all voltages except for 440-460V 60Hz (4) Warning (5) Shut-down (6) Only for ZT 200-230V (7) Motor heater (8) Thermistor protection (9) Only for ZT 380-575V (10) Fan motor, external dryer.
Instruction book 2.4 Cooling water requirements The cooling water quality must meet certain minimum requirements. No general recommendation can encompass the effects of all combinations of the various compounds, solids and gases typically found in cooling water in interaction with different materials. This recommendation is a general guide line for acceptable coolant quality.
Page 38
Instruction book The RSI only indicates the equilibrium of scaling – descaling. Cooling water showing good RSI conditions can still be unsuitable due to other factors. From the table above, the RSI index should be between 5.6 and 7.5; otherwise, contact a specialist. The effect of pH is already calculated in the Rysnar index, but the pH itself has some additional limitations: Z-units 6.8 <...
Instruction book 3 OPERATING INSTRUCTIONS Safety precautions The operator must apply all related safety precautions including those mentioned in this book. Ambient conditions Consult section 7 for the limitations with regard to the ambient conditions and altitude operation. Moving/lifting The compressor can be moved by a lift truck using the slots in the frame. Make sure that the forks protrude from the other side of the frame.
Page 41
Instruction book Transport support (painted red), to be removed Fig. 3.2 Gear casing transport support, ZR 2920 1452 02...
Instruction book Transport bolt, to be removed Transport supports (painted red), to be removed Transport support (painted red), to be removed Figs. 3.3 Transport supports for gear casing and coolers, ZT 3.1 Initial start-up 1. Read the User manual for Elektronikon® regulator to familiarize yourself with all regulator functions. 2.
Instruction book On ZR Full-Feature, the inlet and outlet valves of the cooling water circuit of the regeneration cooler must be opened completely. 9. Check that the gear casing is filled with oil: oil must be visible in sight-glass (SG-Fig. 3.4). 10.
Instruction book 2. On ZR, open the water inlet valve and outlet valve (customer's installation). Opening of the water outlet valve can be overlooked if, after previous operation, the setting of this valve has not been disturbed. By-pass valve Oil drain valve, gear casing Oil filler cap Oil filter Oil level sight-glass...
3. The display will show a service message if a service plan interval has been exceeded or if a service level for a monitored component has been exceeded. Carry out the service actions of the indicated plans or replace the component and reset the relevant timer. Consult your Atlas Copco Customer Centre. See also section 4.1.
Instruction book 6. For ZR, if the compressor is installed in a room where freezing temperatures are expected, drain the cooling system completely: by opening the main drain valves in the water inlet and outlet pipes (customer's installation) by removing the drain plugs: 2-Fig.
Page 47
Instruction book High-pressure compressor element Water drain plug (painted green) Fig. 3.6 Water drain plug, HP compressor element (ZR compressors only) Water drain plug, oil cooler Fig. 3.7 Water drain plug, oil cooler (ZR compressors only) 2920 1452 02...
Page 48
Instruction book DP2/3 Water drain plugs (painted green) Cooler block Fig. 3.8 Water drain plugs, cooler block (ZR compressors only) 2920 1452 02...
(see section 4.1.4) 4.1.2 Service kits Atlas Copco Customer Centres will be glad to provide you with a wide range of service kits. Service kits comprise all parts needed for servicing components and offer the benefits of genuine Atlas Copco parts while keeping the maintenance budget low.
Elektronikon regulator. When reaching a level, a message will appear on the screen. After carrying out all service actions, the interval timers are to be reset using the key "Reset" in menu "Service". Consult your Atlas Copco Customer Centre.
Copco parts while keeping the maintenance budget low. All service kits are mentioned in the relevant Parts Lists. Atlas Copco Roto-Z oil Atlas Copco Roto-Z oil can be ordered in following quantities: Quantity Ordering number 20-litre can 2908 8501 01...
5.3 Safety valves Testing The valves can be tested on a separate compressed air line. If a valve does not open at the pressure specified in section 7.2, consult Atlas Copco. Warning Never run the compressor without safety valves. No adjustments are allowed.
Check water temperature and increase cooling water flow On ZR, restriction in cooling water system due to formation of scale or settling down of dirt Consult Atlas Copco Condensate is not discharged from condensate traps during operation Discharge flexible clogged...
Page 54
Aftercooler air outlet temperature too high On water-cooled compressors, check cooling water inlet temperature and increase water flow. If temperature cannot be decreased sufficiently, consult Atlas Copco On air-cooled compressors, clean cooler externally. If temperature cannot be decreased sufficiently, consult Atlas Copco...
Page 55
Instruction book 11 Condensate only discharged when test button is pressed Sensor dirty Clean sensor Air pressure below minimum pressure Increase air pressure 12 EWD continuously discharges air Control air blocked Check and correct as necessary Sensor dirty Clean sensor 2920 1452 02...
Instruction book 7 PRINCIPAL DATA 7.1 Readings on display (Fig. 1.12) Outlet pressure bar(e) Depends on pressure setpoint Maximum working pressure bar(e) See section 7.4 7.2 Settings of safety valves Low-pressure safety valve bar(e) High-pressure safety valve for ZT/ZR90 7.25 bar 60Hz bar(e) 11.0 compressors...
Instruction book 7.4 Compressor specifications 7.4.1 Reference conditions Absolute inlet pressure bar(a) Nominal working pressure bar(e) See below Relative air humidity Air inlet temperature °C Cooling water inlet temperature °C 7.4.2 Limitations Maximum air inlet temperature °C Minimum air inlet temperature °C Maximum cooling water temperature at inlet (at temperature rise of °C...
Instruction book 7.4.14 Specific data, ZT - 10.4 bar - 60Hz Unit ZT55 ZT75 ZT90 Nominal working pressure bar(e) Maximum working pressure - Pack bar(e) 10.4 10.4 10.4 - Full-Feature bar(e) 10.15 10.15 10.15 Power input at maximum working pressure - Pack 68.6 97.1...
Need help?
Do you have a question about the ZT55-ZT75-ZT90 and is the answer not in the manual?
Questions and answers
Причины перегрев 1 ступени компрессор ZT 75. Температура поднимается до 225гр и уходит в аварию. На улице 32гр плюс. Компрессор стоит в помещении.
Possible causes of overheating in the first stage of the Atlas Copco ZT 75 compressor, with temperatures reaching 225 degrees, include:
1. Blocked or insufficient cooling water flow, especially in open or closed cooling systems.
2. High ambient temperature exceeding 40°C.
3. Malfunctioning temperature sensors.
4. Faulty motor leading to overload.
5. Thermistor protection failure.
6. Inadequate ventilation or fan motor overload.
7. Dirty or clogged intercooler.
These issues can cause the compressor to exceed programmed shut-down temperature levels.
This answer is automatically generated
@Mr. Anderson Компрессор безмасляный, охлождение у него воздушное.
Добрый день. На панельке высветился значок красный и надпись ТРЕВОГА КОНВЕРТЕРА компрессор ZT90 безмасляный. В данный момент работает ZT75 без частотного регулирования а ZT90 стоит в ожидании когда если давление снизится на ZT75 то он включится в работу автоматически. Вопрос про ZT90 , почему высветился статус ТРЕВОГА КОНВЕРТЕРА? Где искать причину, что сделать? Спасибо за ответ.