Initial Magnetic Field Current Detection; Overload Gain - Delta ASDA-A3 Series User Manual

ASDA-A3

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
20%
40%
60%
80%
100%
120%
140%
160%
180%
200%
220%
240%
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.
Operating time
0 12 sec × PM.020
12.3 sec × PM.020
13.6 sec × PM.020
16.3 sec × PM.020
22.6 sec × PM.020
N/A
26.38 sec × PM.019
35.2 sec × PM.019
17.6 sec × PM.019
11.2 sec × PM.019
8 sec × PM.019
6.1 sec × PM.019
4.8 sec × PM.019
Load Operating time
260% 3.9 sec × PM.019
280% 3.3 sec × PM.019
300% 2.8 sec × PM.019
320% 2.5 sec × PM.019
340% 2.2 sec × PM.019
360% 2.0 sec × PM.019
380% 1.8 sec × PM.019
400% 1.6 sec × PM.019
420% 1.4 sec × PM.019
440% 1.3 sec × PM.019
460% 1.2 sec × PM.019
480% 1.1 sec × PM.019
500% 1 sec × PM.019
Linear Motor
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