Phase Orientation Selection
The drive has two functions that allows for the direction of either the motor or encoder to be swapped without needing to rewire the motor or encoder terminals. This allows for easy retrofits or replacements.
The sections below detail the process to swap either the motor or encoder directions via parameters.
When using the Universal Encoder Module, the encoder direction must match the motor direction.
To check this look at the the signs of both P0-18 (Rotor Speed) and P0-19 (Encoder Speed) to see if they match. If they are opposite then set P6-02 so it matches the motor direction. For example if P0-19 has a negative sign but the motor is rotating forward (clockwise, looking at the sheave face on) then swap the value of P6-02 so the encoder matches the motor sign.
For example when using the default motor phase orientation (P11-09 = 0), if the encoder channels are swapped so B leads A (B wires are in A marked terminals in the Universal Encoder Module) and a forward command is given the motor will spin forward but the encoder feedback will read that the motor is running in reverse. This can cause trips and performance issues.
Rather than swapping the cables a parameter change can be performed to swap the encoder's orientation. By using P6-02 (Encoder Feedback Direction) the direction of the encoder can be selected. In the example above you would set P6-02 to 1 so that the encoder direction is reversed and matches to motor direction. Now when a forward command is given both the motor and encoder will show that the motor is running forward.
Note
If you are using a PM motor the encoder offset (P6-09) will be different when P6-02 is changed. An Encoder Offset Auto-tune will need to be performed to re-calculate the encoder offset when P6-02 is changed. To do this you will need to Auto-tune the drive again by setting P4-08 to 2.
Below is a step by step process to change the encoder phase direction with no re-wiring required that is valid for both Induction Motor and Permanent Magnet Motor applications in Closed Loop.
Make sure that the drive has been commissioned correctly and is powered on.
Make sure that the encoder data has been entered and P6-05 is set to ZERO. We will be running in Open Loop to check the encoder direction.
The best practice is to start with the lift car in a balanced position so if the direction is wrong then you will not hit either the top or bottom of the shaft.
Prepare to monitor P0-18 and P0-19 on either the Drive Keypad, PC Tool or Mobile App.
Run the drive at around 10% of your maximum speed.
While the drive is at a stable speed check the values sign in P0-18 and P0-19, both should be the same sign (either both positive or both negative).
The image below shows an example where P0-18 and P0-19 have an opposite sign, in this case the encoder is rotating in reverse (Channel B lead Channel A and the motor is rotating forward with a phase orientation of U, V, W and P11-09 = 0). Which if not changed will cause trips, or poor performance.
The two traces show that when the drive is given a forward run command the motor runs forward (Red - P0-18) but the encoder runs in reverse (Green - P0-19)
If P0-19 is an opposite sign to P0-18 (like the image above from Step 6) then change P6-02's value to the other option (if 0 change to 1 and vice versa).
Run the drive again at 10% speed to check the signs in P0-18 and P0-19 now match. The image below now shows the Motor (Red - P0-18) and Encoder (Green - P0-19) signs running in the same direction.
If both signs now match enable the encoder by setting P6-05 to 1.
Note
If you are using a Permanent Magnet Motor with either an EnDat or SinCos encoder you will need to perform another Auto-tune by setting P4-08 to 3, so the Encoder offset is correct before running the drive in closed loop.
Parameter Number | Parameter Name | Units | Default | Available Settings | Access | Change During Run | Scaling | Size (Bytes) | CAN Register | CAN Sub Index | Modbus Register |
|---|---|---|---|---|---|---|---|---|---|---|---|
P0-18 | Rotor Speed | Hz / rpm / ft/s / m/s | 0.0 | -P8-01 ... P8-01 | RO | N | 1 = 0.1 | 2 | 200C | 0 | 10018 |
P0-19 | Encoder Feedback Speed | Hz / rpm / ft/s / m/s | 0.0 | -P8-01 ... P8-01 | RO | N | 1 = 0.1 | 2 | - | - | 10019 |
P6-02 | Encoder Feedback Direction | N/A | 0: Clockwise Direction | 0: Clockwise Direction 1: Anti-Clockwise Direction | RW | N | N/A | 1 | 2259h | 0 | 602 |
Changes the direction of the incremental signals of the encoder feedback signal.
Setting | Function |
|---|---|
0 | A leads B when an Up command is given (Clockwise Direction) |
1 | B leads A when an Up command is given (Anti-Clockwise Direction) |
Incorrect motor phase orientation can lead to trips including speed error trips (Sp-Err) and situations where the elevator car moves in the wrong direction to the given direction command. To rectify this without having to rewire the drive use P11-09 to select the output phase orientation. Setting 1 swaps the output phases from the standard U,V,W to U,W,V. This allows the user to correctly retrofit or install the drive without having to switch off power and manually swap the output phases.
Note
When swapping the motor direction the drive must be stopped and the Safety Chain should be open.
The Post-Ramp and Pre-Ramp speed sign will not change from the direction input. For example if the motor is given a forward direction and the phases are swapped via P11-09, then the drive will run in reverse but the Pre-Ramp and Post-Ramp will still show a forward sign as that was the command given to the drive.
Below is a step by step guide to adjusting the motor phase direction with no rewiring required.
Make sure that the drive has been commissioned correctly and is powered on.
The best practice is to start with the lift car in a balanced position so if the direction is wrong then you will not hit either the top or bottom of the shaft.
Monitor P0-18 and the actual motor sheave/car travel direction and your selected running direction.
Run the drive in a direction at 10% of maximum speed. For this example forward is the direction chosen.
Check P0-18 sign matches the sheave direction. When running forward (clockwise) P0-18 value should be positive and the lift car should move upwards. When running in reverse (anti-clockwise) P0-18 should be negative and the lift car should be downwards.
If P0-18 is negative when running after a forward command this means the sheave is spinning in the opposite direction.
To change this set P11-09 to the opposite value that it currently set.
Run the drive again and check that P0-18 has changed sign to match the direction of the lift car.
Parameter Number | Parameter Name | Units | Default | Available Settings | Access | Change During Run | Scaling | Size (Bytes) | CAN Register | CAN Sub Index | Modbus Register |
|---|---|---|---|---|---|---|---|---|---|---|---|
P0-18 | Rotor Speed | Hz / rpm / ft/s / m/s | 0.0 | -P8-01 ... P8-01 | RO | N | 1 = 0.1 | 2 | 200C | 0 | 10018 |
P11-09 | Output Phase Sequence | N/A | 0: U, V, W | 0: U, V, W 1: U, W, V | RW | N | N/A | 1 | 2455h | 0 | 1109 |
Select the motor phase orientation.
Setting | Orientation |
|---|---|
0 | U, V, W |
1 | U, W, V Direction of motor rotation when operating in a forward direction will be reversed |