130
System Manual – MOVIDRIVE® compact Drive Inverters
3
Explanation of the parameters
Parameters
P302 / P312 Maxi-
mum speed 1 / 2
Setting range: 0 ... 1500 ... 5500 1/min
The value set here cannot be exceeded by a setpoint selection. If n
min
> n
max
is set, then
n
max
applies.
P303 / P313 Cur-
rent limit 1 / 2
Setting range: 0 ... 150 % I
N
The internal current limitation is based on the apparent current. It is assigned to the
external current limitation (P120 AI2 Operating mode = 0 ... 10 V I-limit). Consequently,
the entry determines the 100 % value within which the external current limitation can
take effect. The current limit is automatically reduced in the field weakening range above
the frequency of 1.15 × f
trans
. This provides protection against the motor deviating from
the optimal operating point.
The current limit effective in the field weakening range can be calculated using the
following formula:
Current limit [%] = (1.15 × f
trans
/ f
act
) × Setting value of P303 / P313 [%]
f
Ist
is the current speed frequency.
P304 Torque limit
Setting range: 0 ... 150 %
The parameter limits the maximum torque of the motor. The entry acts on the setpoint
of the motor torque (k
T
× I
N_inverter
). The value is multiplied by the external current limit
and can be altered with analog input 2. This function is only effective in CFC and SERVO
operating modes. Refer to the "Project Planning" chapter for detailed information about
calculating the setpoint torque (Motor selection for asynchronous servomotors CFC and
synchronous servomotors SERVO).
P32x / P33x Motor compensation 1 / 2 (asynchronous)
P320 / P330 Auto-
matic adjustment
1/2
Setting range: ON / OFF
Only effective in the VFC and U/f operating modes. The function is only useful for single
motor operation. The inverter sets P322 IxR compensation 1 / P332 IxR compensation
2 automatically with each enable and saves the value. The inverter determines a basic
setting that is adequate for a great number of drive applications. The connected motor
is calibrated during the last 20 ms of the pre-magnetization time. The motor is not
calibrated if:
•
P320 Automatic adjustment 1 / P330 Automatic adjustment 2 = OFF
•
P700 Operating mode 1 / P701 Operating mode 2 = VFC & GROUP or VFC &
FLYING START
•
P323 Premagnetizing time 1 / P333 Premagnetizing time 2 has been reduced by
more than 30 ms in relation to the proposed value.
•
VFC n-CONTROL mode is selected and P730 Brake function 1 / P733 Brake function
2 = OFF.
In such cases, the set IxR value is used for calculating the winding resistance.
•
ON: Automatic adjustment.
•
OFF: No automatic adjustment.
NOTE
In the CFC and SERVO operating modes the current limit P303 must always be set
P304 Torque limit to ensure that speed monitoring is triggered reliably.
1
2
P6..
P60.
P600
Summary of Contents for MOVIDRIVE compact MCH41A
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