Chapter 4 Parameters|
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4-64 Revision 2016/03, 6ELE, V1.14
07.06
Motor Rated Slip (Motor 0) Unit: 0.01
Settings 0.00~20.00Hz Factory Setting: 3.00
To setup the rated slip of the motor.
Refer to the rated rpm on the nameplate of the motor and use the following equation to determine the slip.
Rated Slip =F-N
P/120
F: Rated frequency(Hz)
N: Rated rotation speed(RPM)
P: Number of poles (Pole)
Suppose the rated frequency is 60Hz, number of poles is 4, rated rotation speed is 1650rpm, then the rated
slip will be 60Hz-(1650rpm
4/120) = 5Hz.
This parameter is related to Pr07.03 Slip Compensation. In order to have the best result on slip
compensation, make sure that the correct values are filled in the parameters. Any incorrect setting may
disable the functions above and even damage the motor and the motor drive.
Related parameter: Pr07.03 Slip Compensation.
07.07
Slip Compensation Limit
Settings 0~250% Factory Setting: 200
This parameter is to provide a correction for the slip compensation by setting up a limit on the slip
compensation. That is to put a percentage on Pr07.06 Motor Rated Slip. If the motor’s speed is less than the
target value even after adjusting Pr07.03, the slip compensation gain might have reached its limit. At this
time, increase the percentage of the slip compensation limit and then verify the motor’s speed.
Related parameters: Pr07.03 Slip Compensation Gain; Pr07.06 Motor Rated Slip.
07.08
Torque compensation Time Constant Unit: 0.01
Settings 0.01~10.00 sec Factory Setting: 0.30
When a motor’s loading is heavier, its current might suddenly increase and suddenly decreases. Reason
why that happens is because the motor drive is doing current compensation to increase output torque. The
sudden increasing/ decreasing of current might shake work station. To solve this problem, increase the
torque compensation time constant.
07.09
Slip compensation Time Constant Unit: 0.01
Settings 0.05~10.00 sec Factory Setting: 0.20
When a motor’s loading is heavier, its current might suddenly increase and suddenly decreases. Reason
why that happens is because the motor drive is doing speed compensation to reach the same rotating speed.
The sudden increasing/ decreasing of current might shake work station. To solve this problem, increase the
slip compensation time constant.
When Pr07.08 and Pr07.09 are set to be 10 seconds, the longest compensation responding time, might
cause instability on the system.
07.10
Accumulative Motor Operation Time (Min.) Unit: 1
Settings 0~1439 Factory Setting: 0
07.11
Accumulative Motor Operation Time (Day) Unit: 1
Settings 0 ~65535 Factory Setting: 0
Pr.07.10 and Pr.07.11 are used to record the motor operation time. They can be cleared by setting to 0 and
time is less than 1 minute is not recorded.
07.12
Motor PTC Overheat Protection Unit: 1
Factory Setting: 0
Settings 0 Disable
1 Enable
07.14
Motor PTC Overheat Protection Level Unit: 0.1
Settings 0.1~10.0V Factory Setting: 2.4
When the motor is running at low frequency for a long time, the cooling function of the motor fan will be lower.
To prevent overheating, it needs to have a Positive Temperature Coefficient thermoistor on the motor and
connect its output signal to the drive’s corresponding control terminals.
When the source of first/second frequency command is set to AVI (02.00=1/02.09=1), it will disable the
function of motor PTC overheat protection (i.e. Pr.07.12 cannot be set to 1).
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