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Optidrive P2 Elevator User Guide V2.30
49
Advanced Features
www.InvertekDrives.com
P3-12 = 3 (UPS Easiest direction based on Load measurement)
In this mode the direction of travel is controlled by the drive, the travel direction is based on the direction which consumed the least
amount of load (Load measurement) when the drive was last enabled with mains 400V supply operation.
The load measurement is performed during the Motor Brake Release Time (P3-07).
The accuracy of the load measurement depends on the application specifics, accuracy can be improved by increasing the
measurement time (P3-07).
The outcome of the load measurement can be monitored in parameter P0-62 (0 = easiest direction is Upwards, 1 = easiest direction
is Downwards, 2 = Balanced).
If the load measurement could not be performed (balanced load situation) then the drive will instead :
o
Switch to P3-12= 1 (Light Load detection test) in Geared (Induction) systems.
o
Switch to P3-12 = 0 (direction from controller) in gearless systems.
Rescue Mode speed limitation and tuning.
The actual speed will be limited depending on the drives internal DC bus voltage level as shown in the below calculation.
Rescue Mode Speed Limit = DC Bus Voltage (P0-20) x Motor Rated Frequency (P1-09)
1.7 X Motor Rated Voltage (P1-07)
It should also be noted that the level of motor load will affect the available DC bus Voltage; in some cases (More likely on Geared (Induction)
Motors) it may be necessary to reduce the Rescue Speed further in order to prevent nuisance Under Voltage (“
”) trips.
Rescue mode P-gain (P7-17) is available for adjustment to improve speed stability during rescue operation.
Motor presence check before opening mechanical brake.
To ensure that the motor is connected, the drive has a function which checks that at each start command all 3 phases of the motor (Geared
(Induction) and Gearless) are connected prior to releasing the electro-mechanical brake.
Par
Parameter Name
Minimum
Maximum
Default
Units
P3-18
Motor Connected Check
0.0
100.00
15
%
This value (% of motor rated current) must be achieved before the brake is released, if not then it is assumed the motor is not
connected and the drive will trip “
” or “
” (size 2).
If P3-18 is set to a value of zero then the motor connected check function is disabled.
The default value of 15 is in general suitable for most applications, this value can be reduced in order to reduce the audible noise when the
test is performed, an exact value is one in which the audible noise level is acceptable but the drive still detects each of the motor phases
should they not be connected.