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zero speed and at maximum speed. During each subsequent

start and stop, the starter dynamically adjusts its control to

ensure the motor's actual performance matches the selected

profile throughout the start. The starter increases power to

the motor if the actual speed is too low for the profile, or

decreases power if the speed is too high.

5.3 Starting Modes

5.3.1 Constant Current

Constant current is the traditional form of soft starting,

which raises the current from zero to a specified level and

keeps the current stable at that level until the motor has

accelerated.

Constant current starting is ideal for applications where the

start current must be kept below a particular level.

700%

600%

500%

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100%

400%

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10% 20% 30% 40% 50%

Rotor speed (% full speed)

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Current (% motor full load current)

1: Initial current (Par. 1-5)

2: Current limit (Par. 1-4)

3: Full voltage current

5.3.2 Current Ramp

Current ramp soft starting raises the current from a specified

starting level (1) to a maximum limit (3), over an extended

period of time (2).

Current ramp starting can be useful for applications where:

•

the load can vary between starts (for example a

conveyor which may start loaded or unloaded). Set

the initial current (Par. 1-5) to a level that will start

the motor with a light load, and the current limit

(Par. 1-4) to a level that will start the motor with a

heavy load.

•

the load breaks away easily, but starting time

needs to be extended (for example a centrifugal

pump where pipeline pressure needs to build up

slowly).

•

the electricity supply is limited (for example a

generator set), and a slower application of load will

allow greater time for the supply to respond.

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10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

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CURRENT (% Motor Full Load Current)

ROTOR SPEED (% Full Speed)

Full Voltage Stator Current

Current Limit (e.g. Par. 2 = 400% x FLC)

Initial Current (e.g. Par. 3 = 250% x FLC)

Ramp Time

(eg Par. 4 = 10 secs)

5.3.3 AAC Adaptive Acceleration Control

To use AAC Adaptive Acceleration Control to control starting

performance:

1. Select Adaptive Control from the Start Mode menu

(Par. 1-3)

2. Set the desired Start Ramp Time (Par. 1-6)

3. Select the desired Adaptive Start Profile (Par. 1-13)

4. Set a start Current Limit (Par. 1-4) sufficiently high

to allow a successful start. The first AAC start will be

a Constant Current start. This allows the MCD 500

to learn the characteristics of the connected motor.

This motor data is used by the MCD 500 during

subsequent AAC Adaptive Acceleration Control

starts.

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Time

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Speed

1. Early acceleration

2. Constant acceleration

3. Late acceleration

4. Start ramp time (Par. 1-6)

Table 5.1 Adaptive Start Profile (Par. 1-13)

Application Examples MCD 500 Operating Instruction

30 MG.17.K3.02 - VLT

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