
Appendix 8. Instruction Manual for Compliance with UL/c-UL Standard
A8 - 3
2. Operation surrounding air ambient temperature
The recognized operation ambient temperature of each units are as shown in the table below. The
recognized operation ambient temperatures are the same as an original product specification for all of
the units.
Classification Unit name
Operation ambient
temperature
NC control panel 0 to 55°C
Base I/O unit 0 to 55°C
Remote I/O unit 0 to 55°C
CNC system
I/O module 0 to 55°C
Power supply unit 0 to 55°C
Servo drive unit 0 to 55°C
Spindle drive unit 0 to 55°C
Option unit, Battery unit 0 to 55°C
AC
servo/spindle
system
Servo motor, Spindle Motor 0 to 40°C
3. Notes for CNC system
3.1 Selection of external power supply unit
An UL recognized 24Vdc output power supply unit should be used to CNC system.
The “PD25” power supply unit provided by Mitsubishi will be changed to UL recognized product since
September 2000.
4. Notes for AC servo/spindle system
4.1 General Precaution
It takes 10 minutes to discharge the bus capacitor.
When starting wiring or inspection, shut the power off and wait for more than 15 minutes to avoid a
hazard of electrical shock.
4.2 Installation
MDS-B/C1 Series have been approved as the products, which have been installed in the electrical
enclosure. The minimum enclosure size is based on 150 percent of each MDS-B/C1 unit combination.
And also, design the enclosure so that the ambient temperature in the enclosure is 55°C (131°F) or less,
refer to the manual book
4.3 Short-circuit ratings
Suitable for use in a circuit capable of delivering, it is not more than 5kA rms symmetrical amperes.
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