3: I
NSTALLATION
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IRING
FC5A M
ICRO
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MART
U
SER
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S
M
ANUAL
FC9Y-B1268
3-19
Slim Type CPU Module and Expansion Interface Module (DC Power)
Caution
Use a power supply of the rated value. Use of a wrong power supply may cause fire hazard.
The allowable power voltage range for the slim type MicroSmart CPU module, expansion interface
module FC5A-EXM2, and expansion interface slave module FC5A-EXM1S is 20.4 to 26.4V DC. Do
not use the MicroSmart on any other voltage.
If the power voltage turns on or off very slowly, the MicroSmart may run and stop repeatedly or I/
O operation may fluctuate at a voltage lower than the rated voltage.
When MicroSmart I/O signals are connected to a device which may cause a major accident in case
of an error, take a measure to secure safety, such as providing a voltage monitoring circuit outside
the MicroSmart.
Use one power supply to power the CPU module and the expansion interface module or expansion
interface slave module.
When using a separate power supply, power up the expansion interface module or expansion
interface slave module first, followed by the CPU module, otherwise the CPU module causes an
error and cannot start and stop operation.
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.
Power Supply Voltage
The allowable power voltage range for the slim type MicroSmart CPU module is 20.4 to 26.4V DC.
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 20.4V DC, stopping operation to prevent malfunction.
A momentary power interruption for 10 ms or less is not recognized as a power failure at the rated voltage of 24V DC.
Inrush Current at Powerup
When the slim type CPU module, expansion interface module, or expan-
sion interface slave module is powered up, an inrush current of a maxi-
mum of 50A flows.
24V DC
+ –
+
–
Power Supply Wiring
Use a stranded wire of UL1015 AWG22 or UL1007 AWG18 for power sup-
ply wiring. Make the power supply wiring as short as possible.
Run the power supply wiring as far away as possible from motor lines.
For a power supply wiring example of expansion interface modules, see
page 2-77.
Grounding
To prevent electrical shocks, connect the
terminal to a proper ground
using a wire of UL1015 AWG22 or UL1007 AWG18. The grounding also
prevents malfunctioning due to noise.
Do not connect the grounding wire in common with the grounding wire of motor equipment.
Separate the grounding wires of the MicroSmart and external devices which can be a possible noise source.
Use a thick wire for grounding the MicroSmart and make the grounding wire as short as possible to make sure that noises
from external devices can be conducted to the ground effectively.
AS-Interface Master Module
The AS-Interface bus uses a dedicated 30V DC power supply (AS-Interface power supply). For AS-Interface power supply
and power supply wiring, see pages 24-3 and 24-7 (Advanced Vol.).
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
