IDEC MicroSmart - Manual (Page 110)

3: I NSTALLATION AND W IRING
3-16 « FC4A M ICRO S MART U SER ’ S M ANUAL »
Power Supply
All-in-One Type CPU Module (AC and DC Power)
Power Supply Voltage
The allowable power voltage range for the all-in-one type MicroSmart CPU module is 85 to 264V AC for the AC power
type and 16.0 to 31.2V DC for the DC power type.
Power failure detection voltage depends on the quantity of used input and output points. Basically, power failure is
detected when the power voltage drops below 85V AC or 16.0V DC, stopping operation to prevent malfunction.
A momentary power interruption for 20 ms or less is not recognized as a power failure at the rated voltage of 100 to 240V
AC or 24V DC.
Inrush Current at Power-up
When the all-in-one AC or DC power type CPU module is powered up, an inrush current of a maximum of 35A (10- and
16-I/O type CPU modules) or 40A (24-I/O type CPU module) flows.
Power Supply Wiring
Use a stranded wire of UL1015 AWG22 or UL1007
AWG18 for power supply wiring. Make the power supply
wiring as short as possible.
Run the power supply wiring as far away as possible from
motor lines.
Grounding
To prevent electrical shocks, connect the or terminal
to a proper ground using a wire of UL1007 AWG16. The
grounding also prevents malfunctioning due to noise.
Do not connect the grounding wire in common with the
grounding wire of motor equipment.
Caution
• Use a power supply of the rated value. Use of a wrong power supply may cause fire hazard.
• The allowable power voltage range is 85 to 264V AC for the AC power type CPU module and
16.0 to 31.2V DC for the DC power type CPU module. Do not use the MicroSmart CPU module
on any other voltage.
• On the AC power type CPU module, if the power voltage turns on or off very slowly between 15
and 50V AC, the CPU module may run and stop repeatedly between these voltages. If failure or
disorder of the control system, damage, or accidents may be caused, provide a measure for pre-
vention using a voltage monitoring circuit outside the
MicroSmart .
• Use an IEC 60127-approved fuse on the power line outside the
MicroSmart . This is required
when equipment containing the MicroSmart is destined for Europe.
100-240
V AC
L N
24V DC
+ –
+
–
AC Power DC Power