Structured Variable Description
|
Structure Parameter |
Data Type |
Description |
|---|---|---|
|
wSpdNomDrv1 * |
WORD |
Nominal motor speeds of the drive 1 motor used in the distance calculation. Range: 0...6000 Scaling/Unit: 1 RPM |
|
rMotSpdLinDrv1 * |
REAL |
Linear speed of movement at nominal motor speed (wSpdNomDrv1). This is used in the distance calculation. Range: 0...5 Scaling/Unit: 1 m/s |
|
wRampDrv1 |
WORD |
Deceleration ramp for the drive 1. Range: 0...9999 Scaling/Unit: 0.1 s |
|
wScalFactDrv1 * |
WORD |
Scale factor for corrections of distance calculation. Range: 0...200 Scaling/Unit: 1% (default is 100%) Refer to detailed description below. |
|
wSpdNomDrv2 * |
WORD |
Nominal motor speeds of the drive 2 motor used in the distance calculation. Range: 0...6000 Scaling/Unit: 1 RPM |
|
rMotSpdLinDrv2 * |
REAL |
Linear speed of movement at nominal motor speed (wSpdNomDrv2). This is used in the distance calculation. Range: 0...5 Unit: m/s |
|
wRampDrv2 |
WORD |
Deceleration ramp for the drive 2. Range: 0...9999 Scaling/Unit: 0.1 s |
|
wScalFactDrv2 * |
WORD |
Scale factor for correction of distance calculation. Range: 0...200 Scaling/Unit: 1% (default is 100%) Refer to detailed description below. |
* optional, used for Stop on Distance
NOTE: It is ill-advised to use the “slow down” limit switch for the calculation of stop distance between two bridges/ trolleys. When using the photoelectric sensor between the both bridges/ trolleys the configured stop distance between slow and stop positions must be reduced relative the speed of each crane, for example, by 50% if both cranes are moving at the same speed. This can be achieved in user application.
A scaling factor of 0...200% used to adjust the calculated distance traveled to the real distance.
The overall distance calculation is as follows:
D = Scaling Factor * Σ (Actual Speed * ΔTime)
= Scaling Factor * Σ (Linear Speed * Actual Speed * Sample Rate / Nominal Speed)= i_wSclFct[%] * Σ(i_wLinSpd[m/s] * i_iActSpd[RPM] * i_wSmplRate[ms] / i_wNomSpd[RPM])
Example:
|
Nominal speed of motor in RPM |
1500 (from user) |
|
Nominal linear speed in m/s |
1.00 (from user) |
|
Scaling factor in % |
100 (from user) |
|
Actual speed in RPM |
750 (from drive) |
|
Sample rate in ms |
40 (from controller) |
Distance in current cycle = 100% * 1 m/s * 750 RPM * 40 ms / 1500 RPM = 0.02 m
This input corresponds to the deceleration ramp time of the drive.
Example:
|
Nominal speed of motor in RPM |
1500 |
|
Deceleration ramp in seconds |
5 |
|
i_wRampDrv1 |
50 |
NOTE: The parameter assumes a drive default ramp increment configuration of 0.1 seconds. The unit-base used for this parameter must be the same as that configured in the drive. Further, the drive deceleration ramp time must be the same as for this parameter as it is configured in the drive.
This means that the time needed to reach the zero speed from the nominal speed of 1500 RPM is 5 seconds.
