5.6 Safe Disable Input
212 YASKAWA SIEPC71061753C GA500 Technical Manual
Figure 5.25 Connection Example to Use 24 V External Power Supply
Number of Possible Drives to Connect
Power Supply Digital Inputs 24 V Output Number of Drives
Internal power supply
(Drive 1)
Yes
(7-channel input)
Yes
*1
1
No 13
No
Yes
*1
4
No 17
External power supply -
Different for different external power
supply capacities
*2
*1 This is when you use a maximum of 150 mA.
*2 24 V, 12 mA is necessary for each drive.
Use this formula to calculate the number of units to connect:
• n: Number of units to connect
• Io
max
: Maximum current that the power supply can supply (234 mA for the internal power supply)
• I
MFDI
: Current consumed per MFDI (6 mA)
• n
MFDI
: Maximum number of MFDIs that can be activated at the same time (maximum of 7-channel)
• I
sensor
: Current externally supplied for sensor power supply (maximum of 150 mA)
• I
safety
: Current consumed by Safe Disable terminals H1 and H2 (12 mA)
Note:
Round the values to the first decimal place.
■ Enabling and Disabling the Drive Output (“Safe Torque Off”)
Refer to Figure 5.26 for an example of drive operation when the drive changes from “Safe Torque Off” status to
usual operation.
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