Mitsubishi Electric C80 Series Connection And Set Up Manual page 299

C80 Series Connection and Setup Manual
21 Appx.4: Precautions for Compliance to UL/c-UL Standards
(1) Selection of external 24VDC power supply unit (The unit shall be prepared by the machine tool builder.)
This NC system complies with the UL Standards on the condition that the stabilized power supply unit supplying
24VDC to each unit is a UL-approved part of SELV/limited power LPS or Class 2. For initial setup, see the chapter
of "Flow of the initial setup".
Use a UL-approved part for the stabilized power supply unit supplying 24VDC to each unit.
(2) Unit ambient temperature
CNC CPU module complies with the UL Standards on the condition that the unit is used at a temperature less than
the maximum ambient temperature given in "4.1 Installation Environment Conditions". Make sure that the maximum
ambient temperature of each unit does not exceed the temperature given in "4.1 Installation Environment
Conditions".
IB-1501452-C 268