When the Pitagora controller is applied to installations equipped with closed loop gearless machines, comfort and precision can be optimized thus avoiding undesired effects such as rollback (typical of lifts with unbalanced load).
The following parameters can be adjusted to achieve optimal setting for your installation. It is suggested to follow the procedure from start to end in the proposed sequence.
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Starting phase adjustments
| Parameter | Description | Suggested adjustments | Default | |
|---|---|---|---|---|
| Geared | Gearless | |||
| F24 | Starting speed holding time | Do not change this value, unless the installation is equipped with digital positioning system (Magnetic readers) | 0,2 | 0,2 |
| H64 | Zero speed control time | Set value between 0,7 and 0,8 then increase to soften start phase ramp. Important: Enter the "Positioning" Menu and check parameters DIR-BRK (must be kept low: 0,1-0,2) and BRK-S (must be kept higher than H64) | 0,8 | 0,8 |
| H65 | Soft Starter activation | Do not change this value | 0,5 | 0,5 |
| L66 | RBC activation time at zero speed (Specifies the maximum time length for estimating an unbalanced load) | Do not change this value | 2 s. | 2 s. |
| L68 | RBC Proportional Gain (P constant) (specifies the P constant of the Automatic Speed Regulator to be used during RBC calculation time) | Motor overshoots: increase value by 0,25 Vibrations: decrease value by 0,25 | 10 | 1,8 |
| L69 | RBC Integral Time (I constant) (specifies the I constant of the Automatic Speed Regulator to be used during RBC calculation time) | Motor overshoots: decrease value by 0,001 Vibrations: increase value by 0,001 | 0,010 s. | 0,0003 s. |
| L73 | Unbalanced load compensation (specifies the I constant of the Automatic Position Regulator to be used during RBC calculation time) | Motor overshoots: increase value by 0,50 Vibrations: decrease value by 0,50 | 0 | 0,5 |
| L05 | Proportional gain current loop starting phase | It depends on the type of machine | 1,5 | 1,5 |
| L80 | Brake Control (Mode) | Do not change this value | 1 | 1 |
| L82 | ON delay time (specifies the delay time during which the inverter main circuit is kept activated) | Larger Brakes: decrease value by 0,1 Smaller brakes: increase value by 0,1 | 0,2 s. | 0,2 s. |
High speed phase adjustments
| Parameter | Description | Suggested adjustments | Default | |
|---|---|---|---|---|
| Geared | Gearless | |||
| L36 | P" Gain constant at high speed | Speed fluctuations: increase value by 0,25 Vibrations: decrease value by 0,25 | 10 | 2 |
| L37 | I" Time I constant at high speed | Speed fluctuations: decrease value by 0,01 Vibrations: increase value by 0,01 | 0,100 S. | 0,100 S. |
Low speed adjustments
| Parameter | Description | Suggested adjustments | Default | |
|---|---|---|---|---|
| Geared | Gearless | |||
| L38 | P" Gain constant at low speed | Motor stops: increase value by 0,25 Vibrations: decrease value by 0,25 | 10 | 2 |
| L39 | I" Time I constant at low speed | Motor stops: decrease value by 0,01 Vibrations: increase value by 0,01 | 0,100 S. | 0,100 S. |
Stopping phase adjustments
| Parameter | Description | Suggested adjustments | Default | |
|---|---|---|---|---|
| Geared | Gearless | |||
| F25 | DC Brake Parameters Stop Speed | Do not change this value | 0,1 | 0,1 |
| L38 | "P" Gain constant at low speed | Car unable to stay at floor: increase value by 0,25 Vibrations: decrease value by 0,25 | 10 | 2 |
| L39 | "I" Time I constant at low speed | Car unable to stay at floor: decrease value by 0,01 Vibrations: increase value by 0,01 | 0,100 s. | 0,100 s. |
| H67 | Stop speed holding time | Car unable to stay at floor: increase value by 0,25 (Max: 1,0 s) Important: Enter the "Positioning" Menu and check parameters BRK- DIR (must be kept at 2 s) and Stopping Boost (set between 1% and 2%) | 1,5 s. | 1,5 s. |
| L80 | Brake Control (Mode) | Do not change this value | 1 | 1 |
| L82 | ON delay time (specifies the delay time during which the inverter main circuit is kept activated) | Larger Brakes: decrease value by 0,1 Smaller brakes: increase value by 0,1 | 0,2 | 0,2 |
| L83 | Brake Control (OFF delay time) (specifies the delay time between stop speed and turning off of the brake signal) | Larger Brakes: decrease value by 0,1 Smaller brakes: increase value by 0,1 | 0,1 s. | 0,3 s. |
| E16 | Deceleration time # 9 (Last deceleration ramp) | Increase value by 0,5 to soften last ramp (max suggested value: 3 sec) | 1,80 s. | 1,80 s |
Case VVVF controllers with non-encoder based positioning systems
| Parameter | Description | Suggested adjustments | Default | |
|---|---|---|---|---|
| Geared | Gearless | |||
| F24 | Starting speed holding time | Set value between 0,7 and 0,8 | 1 | 0,1 |
| E12 | Acceleration at high speed | Speed fluctuations: increase value by 0,25 | 2 | 2 |
| E13 | Acceleration at low speed | Motor stops: increase value by 0,25 | 2 | 0,100 s. |
| C07 | Creep Speed (10% of high speed) | Motor stops: increase value by 0,1 Vibrations: increase/decrease value by 0,1 | 1,5 s. | |
| C11 | High Speed | If the car is unable to keep floor level, make sure the low speed phase is performed correctly by reducing high speed C11 to half of its value to check that low speed is kept for few seconds, then slowly increase C11. | See Nominal Value on the motor plate | 1 |
