Danfoss VLT AQUA Design Manual page 72

3. VLT AQUA Selection
Real-time clock (RTC) with back-up
The data format of RTC includes year, month, date, hour, minutes and weekday.
Accuracy of clock is better than ± 20 ppm at 25° C.
The built-in lithium back-up battery lasts on average for minimum 10 years, when frequency converter is operating at 40 °C ambient temperature. If
battery pack back-up fails, analog I/O option must be exchanged.
In applications where the motor is used as a brake, energy is generated in the motor and send back into the frequency converter. If the energy can not
be transported back to the motor it will increase the voltage in the converter DC-line. In applications with frequent braking and/or high inertia loads this
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increase may lead to an over voltage trip in the converter and finally a shut down. Brake resistors are used to dissipate the excess energy resulting from
the regenerative braking. The resistor is selected in respect to its ohmic value, its power dissipation rate and its physical size. Danfoss offers a wide verity
of different resistors that are specially designed to our drive code numbers can be found in section
3.7.10. Remote mounting Kit for LCP
The Local Control Panel can be moved to the front of a cabinet by using
the remote build in kit. The enclosure is the IP65. The fastening screws
must be tightened with a torque of max. 1 Nm.
Ordering no. 130B1113
Illustration 3.24: LCP Kit with graphical LCP, fasteners, 3 m
cable and gasket.
LCP Kit without LCP is also available. Ordering number: 130B1117
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Technical data
Enclosure:
Max. cable length between and unit:
Communication std:
Ordering no. 130B1114
Illustration 3.25: LCP Kit with numerical LCP, fasternes and
gasket.
®
MG.20.N3.02 - VLT is a registered Danfoss trademark
®
VLT AQUA Drive Design Guide
How to order
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IP 65 front
RS 485
3 m