Variable Frequency Motor Controllers
Variable frequency drives have many advantages over
more simple, direct on line solutions:
- Eliminates high current requirements during startup and speed change on two speed, pole changing motors
- Achieves multiple speeds with a standard, single speed motor, which is simpler, smaller and less expensive than an equivalent two-speed, pole changing motor
- Superior speed control capability, including pre-set speeds
- Accurate overload protection by monitoring both the motor temperature and current
- Soft starting and speed change to avoid mechanical shocks to windlass and chain
- LCD display with a wide range of messages to help with programming and troubleshooting
Input & Output Terminals
| LABEL DESCRIPTION |
|---|
| 18 | Starboard power supply phase 3 |
| 19 | Starboard power supply phase 2 |
| 20 | Starboard power supply phase 1 |
| 21 | Starboard power supply phase neutral |
| 22 | Starboard motor power supply |
| 23 | Starboard motor power supply |
| 24 | Starboard motor power supply |
| 25 | Starboard brake resistor |
| 26 | Starboard brake resistor |
| 27 | Starboard motor brake |
| 28 | Starboard motor brake |
| 29 | Starboard pendant controller term 7 |
| 30 | Starboard pendant controller term 3 |
| 31 | Starboard pendant controller term 2 |
| 32 | Starboard pendant controller term 1 |
| 33 | Starboard motor thermistor |
| 34 | Starboard motor thermistor |
| LABEL DESCRIPTION |
|---|
| 1 | Port motor thermistor |
| 2 | Port motor thermistor |
| 3 | Port pendant controller term 1 |
| 4 | Port pendant controller term 2 |
| 5 | Port pendant controller term 3 |
| 6 | Port pendant controller term 7 |
| 7 | Port motor brake |
| 8 | Port motor brake |
| 9 | Port brake resistor |
| 10 | Port brake resistor |
| 11 | Port motor power supply |
| 12 | Port motor power supply |
| 13 | Port motor power supply |
| 14 | Port power supply neutral |
| 15 | Port power supply phase 1 |
| 16 | Port power supply phase 2 |
| 17 | Port power supply phase 3 |
|
Enclosure - Powder coated cabinet, IP56
The cabinet houses 2 VFD units (for pair of
windlasses), pre-wired with the necessary
isolators, fuses, relays and terminal strips. |
VFMC Cabinet Dimensions
| MODEL | MD 7.5 | MD 11 |
| W | 1000 mm | 1000 mm |
| H | 800 mm | 800 mm |
| D | 300 mm | 300 mm |
| Weight | 80 kg | 113 kg |
| Max Motor Size | 7.5 kW | 11 kW |
| IP Rating | 56 | 56 |
| Brake Resistor | 175U1847 | 175U1848 |
|
|
Brake Resistor
A Brake Resistor (an integral part of VFMC) is used to dissipate the electrical energy, generated when lowering the windlass. It is not installed in the same cabinet because it does not need to be in an accessible area. Once wired, it should provide years of trouble free service, without need for any maintenance or attention. Since it has protection rating IP 20, it should be installed in a suitably protected area. The Brake Chopper is not needed for controlling stern capstans.
| MODEL | 175U1847 | 175U1848 |
| Power | 10% 7kw | 10% 14kw |
| Resistance | 65 ohm | 40 ohm |
| W | 700 mm | 700 mm |
| H | 100 mm | 100 mm |
| D | 100 mm | 100 mm |
| Mounting Screw | 6mm | 6mm |
| Weight | 3 kg | 5 kg |
|
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