Emheater EM12 Series, User Manual

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EM12 User’s Manual 5. Description of Function Codes
39
Note: Modifying this parameter will make the decimal places of all frequency-related parameters change and
corresponding frequency values change. Pay attention for this in on-site application.
b0-26
Acceleration/Deceleration time base frequency Default 0
Setting
Range
0 Maximum frequency (b0-13)
1 Set frequency
2 100 Hz
The acceleration/deceleration time indicates the time for the frequency inverter to increase from 0 Hz to the
frequency set in b0-26, figure 6-3 is the acceleration/deceleration time diagram. If this parameter is set to 1, the
acceleration/deceleration time is related to the set frequency. If the set frequency changes frequently, the motor's
acceleration/deceleration also changes.
5.2 Group b1: Start/Stop Control Parameters
b1-00
Start mode Default 0
Setting
Range
0 Direct start
1 Rotational speed tracking restart
2 Pre-excited start (AC asynchronous motor)
0: Direct start
If the DC braking time is set to 0, the frequency inverter starts to run from the startup frequency.
If the DC braking time is not 0, the frequency inverter performs DC braking first and then starts to run from the
startup frequency. It is applicable to small-inertia load application andto where the motor is likely to rotate at startup.
1: Rotational speed tracking restart
The frequency inverter judges the rotational speed and direction of the motor firstly, and then starts at the tracked
frequency. Such smooth start has no impact on the rotating motor. It is applicable to the restart of instantaneous
power failure of large-inertia loads. To ensure the perfect performance of rotational speed tracking restart, please set
the motor parameters correctly.
2: Pre-excited start (asynchronous motor)
It is valid only for asynchronous motor and used for building the magnetic field before the motor runs.
For pre-excited current and pre-excited time, see parameters of b1-05 and b1-06.
If the pre-excited time is 0, the frequency inverter cancels pre-excitation and starts to run from startup frequency.
If the pre-excited time is not 0, the frequency inverter pre-excites firstly before startup, improving the dynamic
response of the motor.
b1-01
Rotational speed tracking mode Default 0
Setting
Range
0 From frequency at stop
1 From zero speed
2 From maximum frequency
To complete the rotational speed tracking process within the shortest time, select the proper mode in which the
frequency inverter tracks the motor rotational speed.
0: From frequency at stop
It is the commonly selected mode.
1: From zero frequency
It is applicable to restart after a long time of power failure.
2: From the maximum frequency
It is applicable to the power-generating load.
b1-02
Rotational speed tracking ratio Default 20
Setting Range 1~100
In the rotational speed tracking restart mode, select the rotational speed tracking speed. The larger the value is, the
faster the tracking is. However, too large value may cause unreliable tracking.