Program features 155
Protection functions
The following functions can be used to check and ensure proper operation of elevator
control in different operating conditions: Speed match, Inverter overload, Motor stall
and Leveling overtime stop.
Other protection functions cover Thermal motor protection, DC voltage control and
Programmable protection functions.
Speed match
The Speed match function checks that the motor actual speed (speed estimate or
measured with an encoder, see parameter 22.01 SPEED FB SEL) follows the speed
reference within the desired window during acceleration, deceleration and when
running in a steady state (at set-point speed). The function also ensures that the
brake does not slip while the drive is in a stopped state with the brake closed.
You can enable the Speed match function with parameter 81.01 SPEED MATCH.
There are two parameters for defining the speed match deviation: 81.02 SPD STD
DEV LVL is used for checking the deviation in a steady state, whereas 81.03 SPD
RMP DEV LVL is used for checking the deviation during acceleration and
deceleration.
While the drive is running, it trips on fault SPEED MATCH if the following conditions
are met.
• The motor is running in a steady state and the difference of the motor actual
speed and the ramped speed reference is greater than the value of parameter
81.02 SPD STD DEV LVL for a period longer than defined with parameter 81.04
SPEED MATCH DLY.
Example: If parameter 81.02 SPD STD DEV LVL is set to 0.5 m/s, the drive will
not trip on fault SPEED MATCH as long the difference of the motor actual speed
and the speed reference does not exceed 0.5 m/s (that is, it does not go outside
the enclosed area in the figure below) for a period longer than defined with
parameter 81.04 SPEED MATCH DLY (0.5 s).
• The motor is accelerating/decelerating and the difference of the motor actual
speed and the ramped speed reference is greater than the value of parameter
81.03 SPD RMP DEV LVL for a period longer than defined with parameter 81.04
SPEED MATCH DLY.
Example: If parameter 81.03 SPD RMP DEV LVL is set to 0.6 m/s, the drive will
not trip on fault SPEED MATCH during acceleration/deceleration as long as the
difference of the motor actual speed and the ramped speed reference does not
exceed 0.6 m/s (that is, it does not go outside the enclosed area in the figure
below) for a period longer than defined with parameter 81.04 SPEED MATCH
DLY (0.5 s).
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