1. What are the main functions of KURTARAN devices? How do they operate?
KURTARAN devices are designed to return the elevator cabin to the one upper or lower floor and open the door in the event of a main power failure. They use maintenance-free, dry batteries and operate automatically a few seconds after a power failure. KURTARAN is a fully automatic system. When the main power is available, the batteries are charged optimally and the system waits ready to perform a rescue operation in case of a main power failure. In case of a main power failure, KURTARAN automatically takes over the control from the main system; the emergency lights of the cabin are immediately turned on and a warning massage is announced. The elevator cabin starts moving towards a lower or upper floor within three seconds ( in installations with a back up generator this duration is about 20 seconds). The cabin stops when it reaches a floor level and the doors open automatically. The cabin lights remain on for about 2 more minutes. The rescue operation is completed, and KURTARAN stays in a sleep mode until the power comes back. During this time no current is drawn from the battery. When the main power becomes available, the elevator resumes normal running mode.
2. Are the KURTARAN devices applicable for all types of main control panels of elevators, cabin doors and safety contacts?
KURTARAN devices are applicable for all types of main control panels of elevators, cabin doors and safety contacts. Please refer to Servosan for special cases.
3. How long a distance can the KURTARAN devices run between the two floors?
This depends strictly on the battery capacity. In KURTARAN devices, the capacity of the batteries are enough to make at least three evacuation operations with fully charged batteries. If we accept each operation as a maximum 3 meters, which can be considered as a normal distance between the two floors, so the minimum running distance should be 9-10 meters. Of course this distance depends on the loading of the elevator cabin and in actual cases it may be more than 10 meters.
4. What is the speed of the elevator cabin during an evacuation process?
The speed of the elevator cabin is about 1/10th of the nominal speed.
5. What happens if the main power comes back during an evacuation process?
The KURTARAN continues the evacuation operation as if the main power is still off. After completing its function, the control of the elevator is transfered to the main control panel.
6. In the event of power failure, what happens if there is a back-up electric generator in the system?
The activation time of the KURTARAN devices can be selected as either 2.5 or 20 seconds. If there is a back-up electric generator in the system, KURTARAN waits for 20 seconds to let the generator work. If the generator does not work within this duration, then KURTARAN operates.
7. What happens if the main power returns and fails again in a short time after an evacuation operation?
Although the batteries can not be charged in a short time, the capacity of the batteries should be enough to supply power during the next main power failure. As explained in item 3, the capacity of the batteries are selected to make at least three evacuation operations with fully charged batteries.
8. What happens if there are two independent and separate cabin doors?
There are two independent door control outputs, and hence two independent floor level sensing inputs in the KURTARAN devices. So, two independent cabin doors can easily be controlled.
9. Is it possible for one KURTARAN to operate with two elevators?
No it is not possible.
10. What is the use of the rotation sensor?
The rotation of the main motor is sensed and controlled by the use of the motion sensor.
11. Do the KURTARAN devices operate, if something fails in the elevator system although the main power still exists?
Due to the regulations, KURTARAN devices can only operate when all the safety contacts are closed. So if something goes wrong with the safety contacts, KURTARAN devices cannot operate. Ofcourse it can not operate if something is wrong with the machine itself. Refer to Servosan for special cases.
12. How are the batteries charged and how long does it take to charge them?
The 48V battery group is charged optimally by temperature-compansated constant voltage with limited current method. This charging technique ensures the longest life for the battery. The charging time is a maximum of 20 hours.
13. What is the avarage lifetime of the batteries?
The lifetime of the batteries is specified as 3-5 years at 20°C ambient temperature with stand-by use in their specs. However, the lifetime decreases strictly if the the ambient temperature rises above 30°C. Due to this and many other derating parameters, the practical lifetime may go down considerably.
14. What is the shelf life of the batteries?
The shelf life, that is, self discharge rates of the batteries is strictly dependent on the ambient temperatures. It is common practice to charge the batteries once every 6 months. Batteries should be kept in a dry and cool place.
15. Is there any current drawn from the batteries after the evacuation operation?
About two minutes after a succesfull evacuation, if the main power loss continues, the batteries are disconnected from the circuit to protect them from being discharged.
16. What is the ambient operating temperature of the KURTARAN devices and why is this important?
The ambient operating temperature of the KURTARAN devices is specified as 0°C - 45°C. This limit is specially determined by the operating temperature specs of the batteries.
17. What information is necessary to specify the KURTARAN devices for a specific application?
a) Main motor power ( KW, HP or PS)
b) Brake voltage ( Volts in DC)
c) Cam voltage ( Volts in DC)
d) The types of the door control unit, its supply voltage etc.
18. What are the differences between KURTARAN KGS and KURTARAN KU-S series?
KURTARAN KGS Series devices can be used with elevators with asynchronous motors and can drive the motors directly from the inverter within the KGS unit. This inverter can only drive the asynchronous motors. The evacuation operation is performed by the KGS unit itself.
The KU-S Series are used with synchronous gearless motors. During the evacuation operation, the KU-S device supply necessary power to the main controller and the main inverter to keep it in the evacuation mode. So the evacuation operation is performed with the main controller in this mode.
19. What are the main functions of KAPIMAT devices? How do they operate?
KAPIMAT is a battery powered device and supply either 110 / 220 V 50 / 60 Hz single phase or 220 / 380 V 50 / 60 Hz three phase power to open the car doors during a main power failure. It is a complete device with 24 V batteries, the charger, the transfer relay and the inverter circuit and packed in minimum dimensions. It is specially made for hydrolic elevators.