Basic Rescue Mode
Basic Rescue Mode is a function that is available when the drive is in Rescue Mode (P7-15 = 1), while using either UPS or Battery supply.
Basic Rescue Mode is the simplest Rescue Mode option in P7-02. When Basic Rescue Mode is selected the drive will simply follow the direction given by the Lift Controller. If the Digital Input corresponding to the run forward command is given the drive will run forward until the UPS/Battery runs out of power, the direction command is removed, a fault occurs or the Safety Chain is opened. The same is applicable for the reverse direction command.
When the drive is running forward the display will show uP and when running in reverse the display will show dn.
This function should be selected if the controller is used to select the running direction while in Rescue Mode regardless of load.
The image above shows how to program the drive to use Basic Rescue Mode
While running the drive will indicate direction of travel by the keypad either display uP or dn. When the display shows uP this indicates forward direction and dn indicates a reverse direction. The drive will show the travel speed in Hz next to uP or dn.
All Group 0 monitoring parameters are available to be monitored through the keypad or OptiTools Pro while running in Basic Rescue Mode.
In Rescue Mode the drive uses different parameters for the running gains. Use parameters P7-06 ( Rescue Mode Proportional Speed Loop Gain) and P7-07 (Rescue Mode Integral Speed Loop Gain) to improve the travel comfort in the same way you would use the normal gains.
These may need to be adjusted to smooth out ride quality and subsequently draw less current, persevering the UPS / Battery Supply.
Parameter Number | Parameter Name | Units | Default | Available Settings | Access | Change During Run | Scaling | Size (Bytes) | CAN Register | CAN Sub Index | Modbus Register |
|---|---|---|---|---|---|---|---|---|---|---|---|
P7-03 | Rescue Mode Speed | Hz / rpm / ft/s / m/s | 5.00Hz | P8-02 ... P8-01 | RW | Y *Does not take effect until next travel | 1 = 0.1 Hz | 2 | 22BFh | 0 | 703 |
P7-02 | Rescue Operation Function | N/A | 0: Basic Rescue Mode | 0: Basic Rescue Mode 1: Light Load Detection 2: UPS Easiest Direction based on Load Measurement 3: Energy Optimized | RW | N | N/A | 1 | 22BEh | 0 | 702 |
P7-06 | Rescue Mode Proportional Speed Loop Gain | % | 10.0% | 0.0 ... 400.0% | RW | Y | 1 = 0.1% | 2 | 22C2h | 0 | 706 |
P7-07 | Rescue Mode Integral Speed Loop Gain | ms | 50ms | 0 ... 1000ms | RW | Y | 1 = 0.1ms | 2 | 22C3h | 0 | 707 |
P7-15 | Rescue mode active | N/A | 0: Mains Supply | 0: Mains Supply 1: Rescue Supply | RO | N | N/A | 1 | 22CBh | 0 | 715 |
Setting | Function |
|---|---|
0 | Basic Rescue Mode |
1 | Light Load Detection |
2 | UPS Easiest Direction based on Load Measurement |
3 | Energy Optimized |
There are 3 types of rescue mode operation, the following points of consideration help select the most suitable mode:
If the controller is to choose the direction of travel, then mode 0 should be used.
Mode 1 and 2 lets the drive measure which is the easiest direction of travel to consume the least amount of energy from the UPS/Battery. Mode 1 selects while in Rescue Operation, Mode 2 selects while in normal operation.
Mode 3 is when the drive output should be switched off and controlled by the motor brake.
This parameter defines the motor speed during rescue mode operation (when Rescue mode Input is activated), the value is also controlled internally by the power limit function based on the UPS rating entered into parameter P7-04.
The actual achievable speed will be limited depending on a number of factors such as DC bus voltage level, motor, travel speed, system efficiencies, estimated value can be calculated as follows :
It should also be noted that the level of motor load will affect the available DC bus Voltage; in some cases it may be necessary to reduce the Rescue Speed further in order to prevent nuisance Under Voltage (“U-volt”) trips.
Sets the Rescue Mode P-Gain to improve speed stability during rescue operation.
Sets the Rescue Mode I-Gain to improve speed stability during rescue operation.
Displays the active supply that the drive is being operated from.
Setting | Supply |
|---|---|
0 | Mains Supply |
1 | Rescue Supply |