Delta ASDA-A3 Series, User Manual, Page: 660 / 845

ASDA-A3 Linear Motor
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11
11.6.4 Initial magnetic field current detection
PM.011 (Initial magnetic field current detection) is a parameter used for the linear motor without
a Hall sensor. When the linear motor without a Hall sensor is powered on and the servo is
switched on for the first time, the servo drive outputs the current set in PM.011 and
automatically detects the motor initial magnetic field by the vibration of the motor to obtain the
current magnetic field data of the motor. The current affects the vibration level of the linear
motor during detection. The appropriate current can overcome the friction between the motor
and the mechanism to complete the initial magnetic field detection. Excessive current causes
the linear motor to vibrate too much, which may result in machine crashing. On the other hand,
when the current is too low, it may not be able to overcome the friction and complete the initial
magnetic field detection, which triggers AL052. For the settings of PM.011, refer to Chapter 8
Parameters.
11.6.5 Overload gain
The overload gain setting is for protecting the device. Under normal circumstances, set PM.019
and PM.020 to 100%. These parameters do not affect the motor operation. When setting these
parameters to above 100%, use the monitoring variable -91 to monitor whether the overload
(AL006) exceeds 100%.
Load Operating time Load Operating time
0 12 sec × PM.020 260% 3.9 sec × PM.019
20% 12.3 sec × PM.020 280% 3.3 sec × PM.019
40% 13.6 sec × PM.020 300% 2.8 sec × PM.019
60% 16.3 sec × PM.020 320% 2.5 sec × PM.019
80% 22.6 sec × PM.020 340% 2.2 sec × PM.019
100% N/A 360% 2.0 sec × PM.019
120% 26.38 sec × PM.019 380% 1.8 sec × PM.019
140% 35.2 sec × PM.019 400% 1.6 sec × PM.019
160% 17.6 sec × PM.019 420% 1.4 sec × PM.019
180% 11.2 sec × PM.019 440% 1.3 sec × PM.019
200% 8 sec × PM.019 460% 1.2 sec × PM.019
220% 6.1 sec × PM.019 480% 1.1 sec × PM.019
240% 4.8 sec × PM.019 500% 1 sec × PM.019
The time required for the motor protection level at the normal level to reach the overload level is
called the operating time. When the protection level reaches the overload level, AL006 is
triggered. The load ratio is based on 100%. When the ratio is above 100%, it is load increase
gain (PM.019); when the ratio is less than 100%, it is load decrease gain (PM.020). The load
ratio affects whether the load is accumulated. When the load accumulates over 100%, the
operating time must be taken into consideration, or else AL006 occurs. If the load ratio is below
100%, you do not need to consider the operating time.
Note: for detailed parameter description, refer to Chapter 8 Parameters.