YASKAWA GA800 Technical Reference page 306

5.6 Safe Disable Input
The Number of Possible Units to Connect
Power Supply
Internal power supply
(Drive 1)
External power supply
*1 This is when you use a maximum of 150 mA.
*2 24 V, 12 mA is necessary for each drive.
Use the this formula to calculate the number of units to connect:
• n: Number of units to connect
• Io
: Maximum current that can be supplied from the power supply (234 mA for the internal power supply)
max
• I
: Current consumed per MFDI (6 mA)
MFDI
• n
: Maximum number of MFDIs that can be activated at the same time (maximum of 8-channel)
MFDI
• I
: Current externally supplied for sensor power supply (maximum of 150 mA)
sensor
• I
: Current consumed by Safe Disable terminals H1 and H2 (12 mA)
safety
Note:
Round the values off to the first decimal place.
306
Figure 5.32 Connection Example to Use 24 V External Power Supply
MFDI
Yes
(8-channel input)
No
24 V Output
*1
Yes
No
*1
Yes
No
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YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Number of Drive Units
3
15
7
19
Different for different external power supply
*2
capacities