Extended drive curve

 

Starting jerk

 

 

Here, you can define the starting behaviour of the elevator via these parameters

 

AR

Total duration of start operation until the transition of the acceleration ramp

VA

Starting speed

AR-Type

You can choose between a static and dynamic starting behaviour

 

static (0)

The set value acceleration ramp does not start before the time AR has elapsed

 

dynamic (1)

As soon as the actual speed has exceeded a minimum threshold (VA/2), the set value acceleration ramp starts

 

By selecting adequate starting parameters, you can reach a "soft" starting behaviour. The elevator will start smoothly and without any jerking.

 

Floor-to-floor correction (SC)

 

If the drive command (3) is cancelled during the acceleration ramp, a floor-to-floor travel operation is initiated. The shape of this floor-to-floor travel operation, however, can only be influenced significantly using the parameters SC and R-SC if the drive command is canceled early, so that there is a sufficient distance available for the required shape of the curve. If the travel command is canceled a short time before the final speed is reached, the shape of the curve cannot be varied.

 

(1)

High values for SC result in high speeds and correspondingly short travel times.

(2)

Low values for SC result in low speeds and correspondingly long travel times.

 

Rounding (R_SC)

With R_SC the rounding of the curve can be set:

R_SC = 0:              no rounding

R_SC = 1000:        maximum rounding

 

Speed transitions

As a standard, high speed V4 is used as the basis for the set value ramps. That means, HL and B relate to this speed. If acceleration is to be done to another speed, e.g. V2, the calculation of the acceleration time is done such that the acceleration is the same as in the case of acceleration to V4. As a result the ramp times are shorter by the factor of the selected speed divided by V4. In the case of speed transitions with a small difference this means that small ramp times with small roundings are generated, which can result in an uncomfortable driving behaviour.

Using the following parameters, this calculation based on the constant acceleration can be avoided, and the required sections of the travel curve can be set individually.

 

Activation is done by entering values greater than 500 msec, smaller values are automatically set to 0 and ignored by the travel curve calculator.

 

T V4 -> Vz

With this parameter, the transition time (independent of the speed difference) can be set from V4 to one of the intermediate speeds V3 or V2.

HL-V3

Acceleration ramp for intermediate speed V3.

B-V3

Deceleration ramp for intermediate speed V3.

HL-V2

Acceleration ramp for intermediate speed V2.

B-V2

Deceleration ramp for intermediate speed V2.

 

S-REF

If a reference signal is available and is to be evaluated, the distance of the reference signal to the flush landing level must be entered here.

 

Activation of reference function:

By setting parameter S_REF to values > 0, the function is activated.

The required system data (transmission, pulley diameter and suspension) must be entered correctly.

The reference function is only possible for speeds V3 and V4!

 

Terminal Functionality:

If the function is activated, the V0 terminal is used for connection of the reference signal. For this reason, speed V0 is not used in this case. Note that some control systems (wrongly) use V0 for inspection travel operations - this is no longer possible if the reference function is activated. In this case V1 must be used.

 

Reference signal of elevator control:

When the zone reached, the reference signal must be switched to +24 V and remain on High until the end of the travel operation.

 

Info

For more details, please refer to the VVVF controller manual.

 

 

Version 002 / Date: 17.09.2007