YASKAWA GA700 Series Technical Manual page 272

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.
■
Enabling and Disabling the Drive Output ("Safe Torque Off")
Refer to Figure 5.31 for an example of drive operation when the drive changes from "Safe Torque Off" status to
usual operation.
272
Figure 5.30 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 SIEPC71061705H GA700 Series Technical Manual
Number of Drive Units
3
15
7
19
Different for different external power
*2
supply capacities