Engineering project references
From a 5.5 kW slewing motor to a pair of 500 kW grab crane drives, the motion determines what the drive must do.
Applications
Explore the recorded crane motions, drive ratings and field photographs. The shipyard shaft-generator entry is included as a related marine electrical reference.
The OEM specified high torque at low frequency, suspended-load sway control and mechanical brake sequencing across its crane and hoist range.
Customer record. Site and cabinet photographs accompany three motor nameplates. The 500 N·m value is the torque rating of the motor’s brake.
The ACC860 application record describes a second OEM that specified low-frequency torque, anti-sway and brake control. Its operator interface identifies separate hoist, radius-adjustment and slewing mechanisms.
Customer record. At a displayed radius of 50 m, one HMI screen showed 2.2 t actual against a displayed 2.5 t limit. These readings describe one machine state.
The customer used a ZPMC port crane. The project photographs show the quayside application and its hoist drive cabinet. A local keypad, incoming breaker and three-phase power conductors are visible inside the cabinet.
Customer record. The available feedback is photographic. A drive rating and measured operating results were not provided for this installation.
The drive application changes the elevation of the stacker/reclaimer boom. Boom angle governs the working position over the stockpile, while the belt on the boom performs a separate conveying duty.
Customer record. The project photographs show the machine and the cabinet assembly. The number of cubicles visible does not establish the number of luffing drives.
This South American operation used a Konecranes grab crane with two 500 kW variable-frequency drives for hoisting. Field images show the grab at different heights above and inside the process bay.
Customer record. The field images show the lifting application. Individual assignments to hoisting or grab closing and any synchronization method were not specified.
| Motion | Motor group | Drive group |
|---|---|---|
| Auxiliary hook | 2 × 400 kW | 2 × 500 kW |
| Main hook | 4 × 400 kW | 4 × 500 kW |
| Luffing | 2 × 400 kW | 2 × 500 kW |
| Slewing | 6 × 110 kW | 3 × 280 kW |
| Tool hanger | 2 × 75 kW | 2 × 90 kW |
| Travel | 2 × 75 kW | 2 × 90 kW |
Rectifier supply: 6 × 560 kW, 12-pulse.
The INOMAX ACS880 schedule assigns separate drives to the main hook, auxiliary hook and luffing motions. On the slewing axis, each 280 kW inverter controls two 110 kW motors.
Customer record. The project equipment list identifies ratings, quantities and model codes for six crane motions and the rectifier supply.
One crane-ship entry lists 250 / 355 kW. A second entry on the same project sheet lists eight 400 kW units. The figures are recorded separately because the sheet does not pair them with specific crane motions.
Customer record. The source sheet includes equipment photographs and power entries. Individual motor assignments and operating measurements are unspecified.
The shipyard reference shows quayside lifting equipment alongside open electrical cabinets. The source identifies the electrical application as a shaft generator.
Customer record. The images document the quayside setting and cabinet arrangement. The generator ratings are attributed only to the shaft-generator entry.
| Input | Output |
|---|---|
| 3-phase 380 V | 3-phase 380 V |
| 1-phase 220 V | 3-phase 220 V |
| 1-phase 220 V | 3-phase 380 V |
The buyer requested separate order codes, heavy-duty ratings and details of the step-up arrangement for the third version.
A crane-drive buyer requested small dedicated hoist drives with closed-loop vector control, encoder support, zero-speed holding and torque verification before the mechanical brake opens.
Customer record. INOMAX confirmed feasibility for the non-certified requirements. The requested model-specific certified safety package was unavailable. The enquiry carried no purchase commitment.
Drive functions
Bring a loaded hoist under motor control as the mechanical brake releases. Use current, speed range and duty from the actual motor plate.
Coordinate torque verification, brake release, feedback and brake-fault handling across loaded starts and stops.
The ACC program shapes travel speed commands during acceleration and deceleration to reduce suspended-load swing.
Match the braking duty to the load and cycle. A chopper and resistor or a regenerative active front end can be evaluated for a new installation.
Engineering FAQ
Selection questions for crane builders, retrofit teams and electrical integrators.
A replacement can be evaluated against the original drive code, motor and brake plates, encoder, PLC interface and space in the panel. For a hoist, include the brake sequence, rated and peak currents, lowering duty and mandatory safety functions. These determine whether a specific model can be offered.
The project plates show 12 A, 14 A and 16.9 A at 380 V. The connections, intermittent duties and speed ranges also differ. Supply the actual motor plate and load cycle so the drive current and overload rating can be selected for the axis.
The INOMAX ACC program described here estimates sway and shapes the speed reference without a dedicated swing sensor. Identify whether the motion is trolley travel, bridge travel or tower-crane slewing. Specify the load and rope-length range and how residual swing will be assessed.
Both are options to evaluate. Provide the suspended load, lowering speed, time per descent and cycles per hour. Those figures allow engineering to size a chopper and resistor or assess a four-quadrant active front end (AFE) against site power-system requirements.
A shared drum may call for torque sharing. Independent hooks may require position synchronization. Send the mechanical layout, encoders, brake arrangement, required position tolerance and response to a fault on either axis.
Provide the encoder type and supply, feedback resolution, PLC command interface, brake coil voltage, release time and available brake feedback. Engineering can then identify the appropriate feedback card, I/O and coordination sequence.
Ordinary brake logic coordinates operating torque and the mechanical brake. A procurement requirement for certified SBC needs model-specific certification and a safety manual. The evaluated package could not meet the requested certified STO, SBC, SS1, SLS, SOS, SDI and SSM functions at the specified SIL or PL levels.
A private-label enquiry included three versions: 380 V three-phase in/out, 220 V single-phase to 220 V three-phase, and 220 V single-phase to 380 V three-phase. Request the precise order code, continuous current and heavy-duty derating. For voltage step-up, the quotation should identify whether it is internal or external.
Send the axis list, motor and brake data, duty cycle, site conditions, mandatory certificates, quantity and required date. For private-label supply, identify the branding, documentation and firmware changes. The quotation can then define options, commissioning support, lead time and warranty.
Project enquiry
Send the motor and brake nameplates, the driven motion, the operating cycle and any mandatory certification.
Customer identities and selected engineering details are withheld to respect privacy and confidentiality agreements. INOMAX sales can share further technical information for a comparable project within the applicable permissions.
