13.3.3. Evacuation in the lower load direction:
Performing the evacuation in the lower load direction can help to minimize the power
requirement during the evacuation operation. It is highly recommended to use this facility when
the evacuation direction is not mandatory.
During each travel, ADrive determines the lower-load direction which depends on the weight
imbalance between the car and the counter-weight. This information is output from TO1 terminal
and it may be used by external devices which need this information.
Method of “Evacuation in the lower-load direction” maybe activated or deactivated by the “12.2-
DIRECTION” parameter.
- On evacuation, if 12.2 parameter is set to “BD:EASIEST DIR.”, ADrive will ignore the
direction command from the controller and will move automatically towards the “lower-load
direction”
- If 12.2 parameter is set to “BD:COMMAND DIR.”, TO1 lower-load direction output must be
read by the controller and the controller must give the appropriate evacuation direction
command to the driver.
During evacuation, exact stopping point depends on the car-load. The floor level may be missed
slightly.
13.3.3.1. Back-up Power Requirement Calculations for Evacuation Towards
Lower-Load Direction:
As the car will be moved in the same direction in which the gravity forces the system to move, the
back-up power will only be used to slow down the car and (if the system is nearly balanced) to
accelerate the car.
If the travel speed on evacuation is set too low, this will elongate the travel time and will cause the
brake coil to consume energy for a longer period. Because of this, setting the evacuation speed to a
value between %15 and %35 of nominal motor speed is recommended. Evacuation speed is
limited by “12.3-BAT.Speed” (V4) parameter. Even if it is possible to move faster by back-up
power, the driver will not allow the car to exceed the speed set by this parameter.
If the distances between floor levels are long, the evacuation time will be long which means the
power consumption will be higher. While calculating the back-up power requirements, this fact
must also be considered.
The voltage of the connected back-up power must be set in the parameter “12.1-BAT.VOLTAGE”.
a) With battery supply:
60 VDC battery voltage is sufficient. While determining the capacity required for the batteries, a
rule of thumb is, choosing the batteries such that battery capacity in Ah’s will be at least 1/3
rd
of
the motor current in A’s. For example; at least a 7Ah battery must be used for a 21A motor.
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