KEB COMBIVERT F5, Руководство по эксплуатации, Страница: 11 / 138

11
Electrical Connections
A line choke with minimum 3% impedance is required for all 230 V
inverters 50hp (size 20) and greater. A line choke with minimum 3%
impedance is required for all 480V inverters 100hp (size 23) and greater.
Alternately, an isolation transformer installed between the main line and
the elevator drive will satisfy the same requirement.
The line choke (or transformer) is used to prevent nuisance errors and
damage caused by voltage spikes. Additionally, the use of a line choke will
double the operational lifetime of the DC bus capacitors in the unit. At the
same time the choke will reduce the harmonic distortion of the line current
from very high values of 80-100% THiD to around 45% THiD.
If lower values of line current distortion are required, Contact KEB regarding
an applicable harmonic filter. With such a device it is possible to reduce the
harmonic distortion below 8% THiD.
The F5 series elevator drive is UL approved as a solid state motor overload
protection device. It is necessary to adjust the current trip level in param-
eter LM09 Electric Motor Protection Current (IM) or LM03 Motor Current
(PM). The function assumes the use of a non-ventilated motor. The func-
tion meets the requirements set forth in VDE 0660 Part 104, UL508C sec-
tion 42, NFPA 70 Article 430 part C. See the description for parameter
LM08 Electric Motor Protection for the trip characteristics.
A motor winding sensor can also be used for additional safety and the high-
est level of protection. Either a normally closed contact (rating: 15V / 6mA)
or a PTC (positive temperature coefficient) resistor can be connected to the
T1, T2 terminals on the inverter. The thermal device should be connected
as indicated in Sections 1.7 and 1.8.
The F5 Elevator drive can also accept a KTY type temperature sensor. This
sensor will give an analog temperature reading which can be displayed
directly in the diagnostic parameters. Additionally, a temperature level can
be set to give a warning signal to the controller to indicate the motor is be-
coming too hot. This allows the controller to stop taking calls or adjust door
open time in an effort to reduce motor temp. A KTY sensor is standard on
drive sizes with R-housing and above or as an added option to drive sizes
in housings H and below.
The KTY device is a solid state device. The approved model number is
KTY-84 (1000Ω at 100° C).
1.2.5. Line Chokes
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1.2.6. Motor Thermal
Protection