Integrating STEIDLE Lubrication with a PLC Network

Centralized lubrication is often treated as a mechanical service, yet modern presses, production lines and CNC machines depend on it for consistent friction control, reduced wear and uptime. Connecting a STEIDLE installation to a programmable logic controller changes it from a timed routine into a monitored process with clear alarms, operating data and controlled starts.

A successful design defines which decisions belong to the PLC, which remain inside the lubrication equipment, and where local protection must take over if communications fail. The pump may run from a solenoid valve while the PLC receives pressure-switch, flow-switch or level feedback. A SCADA workstation can display the same status without becoming part of the safety function.

Australian plants should plan for real operating conditions rather than a generic factory model. Facilities around Melbourne, Sydney and Perth commonly combine imported production assets with locally built conveyor, packaging and maintenance systems. Controllers may operate from 240 V and 50 Hz supplies, while motor starters, three-phase distribution and network cabinets must suit the site’s AS/NZS electrical requirements.

Imported German components also require clear procurement boundaries. Pumps, nozzles, hoses, oil, spare parts, pneumatic pumps, transmission pumps and micro-lubrication equipment should be matched to one another and to the PLC input/output schedule. Pricing, availability and lead times can be confirmed through the Shenzhen office before control panels or cable schedules are released.

Map the control and lubrication architecture

Begin with a point-to-point drawing rather than a network diagram. Label the reservoir, pump or pumps, primary manifold, distribution hoses, nozzles, pressure and flow switches, solenoid valves, and any level or temperature sensor. Mark which points use centralized lubrication and which use micro-lubrication, because their metering requirements and fault responses may differ.

The control boundaries can be separated as follows:

Control layer	Main responsibility	Typical exchange with the PLC
PLC and machine control	Cycle logic, recipes and interlocks	Run demand and equipment status
STEIDLE lubrication equipment	Metering fluid and distributing it to points	Start command with pressure or flow feedback
Local protection	Overload, pressure limit and emergency functions	Hardwired fault or permissive
SCADA or historian	Trends, alarms and maintenance records	Read-only status and selected measurements

Nozzle layout affects whether a pressure reading represents healthy delivery throughout the system. A practical explanation of centralized nozzle positioning highlights why blocked passages, excessive hose lengths and unsuitable fittings can produce misleading results.

During commissioning, compare the physical drawing with the actual pipe and hose route. Each pressure zone should be identifiable, and every nozzle should have enough clearance for inspection. This is particularly important where a machine builder has added sensors or altered guarding after the original lubrication system was installed.

Select PLC signals and communications

Treat hardwired discrete input and output as the dependable starting point. A PLC output can operate a relay or suitable solenoid driver for the pump, while separate inputs receive pressure-switch, flow-switch, level or pump-running signals. Galvanic isolation, appropriate voltage ratings and surge protection should follow the STEIDLE documentation and the plant’s electrical design.

Network communication can provide richer diagnostics, but it should not be assumed to be available on every pump or controller. Where supported, an industrial gateway may translate PROFINET, EtherNet/IP or Modbus TCP messages between the PLC and a compatible lubrication controller. SCADA platforms such as Ignition or FactoryTalk can collect trends through the plant historian, firewall rules and approved industrial protocols.

The PLC program should describe the operating sequence rather than a collection of isolated commands. A typical recipe includes a pre-lubrication time, a permitted pressure range, a maximum continuous run and the response to a failed start. An adjustable parameter set can reduce commissioning effort, but each value needs a documented limit so an operator cannot accidentally disable essential protection.

Design safe interlocks and local fallbacks

The most important interlock is usually the relationship between lubrication and machine movement. A press or CNC machine may require a successful pre-lubrication cycle before motion is permitted. After startup, a pressure loss might trigger a controlled stop rather than an immediate shutdown, depending on the machine’s hazard assessment. The correct safe state must be decided by the risk assessment, not copied from another installation.

For plants handling fuels, chemicals or dusty materials, electrical equipment in a hazardous area may need certification under AS/NZS IEC 60079. This is relevant to mining operations around Perth and other industrial sites where a standard control cabinet cannot simply be moved into a classified zone. Network cables, gateways, solenoids and sensors must remain suitable for the specified area classification.

Safe Work Australia guidance, state and territory work health and safety laws, and the site’s lockout and isolation procedures should also shape the control design. Final electrical connections and alterations may need to be completed or checked by a licensed electrician. Keep local manual controls available for maintenance, but make clear whether local operation bypasses PLC interlocks and who is authorised to use them.

Commission with staged checks and acceptance criteria

Test the interface before involving the mechanical system. Use the PLC simulator or force inputs to prove that every alarm, permissive and output behaves as shown on the drawings. Then perform an offline test of pump starting, solenoid operation and feedback polarity with the fluid circuit isolated or depressurised.

For high-speed press applications, high-speed press installation practices provide a useful reference for nozzle clearance, hose restraint and contamination control. These checks become more important where a missed lubrication event can damage a die or interrupt a tightly timed production cycle.

Pre-start verification

• Confirm that drawings, I/O schedules, cable labels and equipment manuals use the same equipment tags.
• Check supply voltage, earth continuity, output loading and network address assignments against the approved design.
• Inspect hoses, fittings, nozzle directions, reservoir capacity and pump rotation before energising the system.

Live acceptance checks

• Record pressure and flow readings at every critical zone during startup, steady running and normal shutdown.
• Force a simulated fault to confirm alarm creation, event logging, machine interlocks and operator messages.
• Repeat the operating cycle at the normal production recipe and compare results with the agreed acceptance limits.

Complete commissioning with an as-built I/O schedule, updated drawings, backup files and a short operating guide. Include the approved fluid type, clean-out procedure, inspection intervals and a clear definition of when maintenance personnel should call the Shenzhen office for replacement parts or technical support.

Plan support, spares, and a phased rollout

Long-term reliability depends on stocking the right consumables and documenting their compatibility. A useful spare holding may include pump seals, drive components, solenoid coils, nozzle tips, hose assemblies, filters and seals. The quantity should reflect expected lead times rather than a generic percentage of installed equipment, particularly for imported metric fittings and specialised pump assemblies.

Fluid selection must match the machine, the STEIDLE components and the required viscosity. For specialist fluid matching or supporting documentation, send a lubricant supply enquiry with the machine model, operating temperature, lubricant specification and quantity estimate. Keep the selected product details in the maintenance system so a replacement order cannot introduce an incompatible oil.

For a phased rollout, begin with one machine or a non-critical production area, then expand after the PLC sequence and alarm response have proved stable. Confirm pricing, availability, accessories and delivery dates through the Shenzhen office before ordering. To move from design to installation, send the plant layout, machine cycle sequence, fluid requirements, PLC model, I/O schedule and target commissioning date, and request a complete STEIDLE quotation with compatible equipment, spare parts, lead times and integration support.