Brand: Fläkt Woods
Category: Electric Motors
Document Type: Installation Guide
Language: EN
Installation Guide for MT Series
Uploaded: Nov. 21, 2025, 7:56 p.m.
Warranty Information
Ignoring these instructions may invalidate the warranty.
Use: These motors are designed for industrial drive applications. They are suitable for normal ambient temperatures between -25°C and +40°C, and a maximum altitude of 1000m. Ensure proper ventilation and avoid exposure to dust, vibration, and extreme temperatures. For single-phase motors with electrolytic capacitors, reforming may be necessary after prolonged storage.
Handling: Motors should be stored indoors in dry, vibration-free, and dust-free conditions. Unprotected surfaces should be treated with anti-corrosive paint. Rotate shafts periodically to prevent grease migration. Anti-condensation heaters, if fitted, should be energized. For transport, use locking devices for cylindrical-roller or angular contact bearings.
Lifting: Use only designated lifting lugs. Ensure lifting equipment is appropriate and hooks fit the lugs. Avoid damaging auxiliary equipment and cables.
Troubleshooting and error codes
| TROUBLE | CAUSE | WHAT TO DO |
| Motor fails to start | Blown fuses | Replace fuses with proper type and rating. |
| Overload trips | Check and reset overload in starter. | |
| Improper power supply | Check to see that power supplied agrees with motor name plate and load factor. | |
| Improper line connections | Check connections with diagram supplied with motor. | |
| Open circuit in winding or control switch | Indicated by humming sound when switch is closed. Check for loose wiring connection. Also, ensure that all control contacts are closing. | |
| Motor stalls | Mechanical failure | Check to see if motor and drive turn freely. Check bearings and lubrication. |
| Short circuited stator | Indicated by blown fuses. Motor must be rewound. | |
| Poor stator coil connection | Remove end bells, locate with test lamp. | |
| Rotor defective | Look for broken bars or end rings. | |
| Motor may be overloaded | Reduce load. | |
| One phase may be open | Check lines for open phase. | |
| Wrong application | Change type or size. Consult manufacturer. | |
| Overload | Reduce load. | |
| Motor runs and then dies down | Low voltage | Ensure the name plate voltage is maintained. Check connection. |
| Open circuit | Fuses blown, check overload relay, stator and push buttons. | |
| Power failure | Check for loose connections to line, fuses and control. | |
| Motor does not come up to speed | Not applied properly | Consult supplier for proper type. |
| Voltage too low at motor terminals because of line drop | Use higher voltage or transformer terminals or reduce load. | |
| Starting load too high | Check connections. Check conductors for proper size. | |
| Broken rotor bars or loose rotor | Check load motor is supposes to carry at start. Look for cracks near the rings. A new rotor may be required, as repairs are usually temporary. | |
| Motor takes too long to accelerate and/or draws high amp | Open primary circuit | Locate fault with testing device and repair. |
| Excessive load | Reduce load. | |
| Low voltage during start | Check for high resistance. Adequate wire size. | |
| Defective squirrel cage rotor | Replace with new rotor. | |
| Wrong rotation | Applied voltage too low | Get power company to increase power tap. |
| Wrong sequence of phases | Reverse connections at motor or at switchboard. | |
| Motor overheats while running underloaded | Overload | Reduce load. |
| Frame or bracket vents may be clogged with dirt and prevent proper ventilation of motor | Open vent holes and check for a continuous stream of air from the motor. | |
| Motor may have one phase open | Check to make sure that all leads are well connected. | |
| Grounded coil | Locate and repair. | |
| Unbalanced terminal voltage | Check for faulty leads, connections and transformers. |