YASKAWA GA50U Series

18 Safe Disable Input
194 YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation
When the Safe Disable function is triggered during stop, close the circuit between terminals
H1-HC and H2-HC to disable “Safe Torque Off”. Enter the Run command after the drive
stops correctly.
• During Run
When the Safe Disable function is triggered during run, close the circuit between terminals
H1-HC and H2-HC to disable “Safe Torque Off” after clearing the Run command. Enter the
Stop command, then enter the Run command when terminals H1 and H2 are ON or OFF.
■ Safe Disable Monitor Output Function and Keypad Display
Refer to Table 18.3 for information about the relation between the input channel status, Safety
monitor output status, and drive output status.
Table 18.3 Safe Disable Input and External Device Monitor (EDM) Terminal Status
Input Channel Status
Safety Monitor
Output Status
Drive
Output
Status
Keypad
Display
READY
LED
MEMOBUS Register
0020H
Input 1
(H1-HC)
Input 2
(H2-HC)
MFDO
Terminal
(H2-xx =
21)
MFDO
Terminal
(H2-xx =
121)
bit C bit D
ON
(Close the
circuit)
ON
(Close the
circuit)
OFF ON
Baseblock
(Drive
ready)
Normally
displayed
READY:
Illuminated
0 0
OFF
(Open)
ON
(Close the
circuit)
OFF ON
Safety
status
(STo)
SToF
(Flashing)
ALM/ERR:
Flashing
1 0
ON
(Close the
circuit)
OFF
(Open)
OFF ON
Safety
status
(STo)
SToF
(Flashing)
ALM/ERR:
Flashing
1 0
OFF
(Open)
OFF
(Open)
ON OFF
Safety
status
(STo)
STo
(Flashing)
READY:
Flashing
0 1
Safety Function Status Monitor
The drive Safety monitor output sends a feedback signal about the status of the Safety function.
The Safety monitor output is one of the possible settings available for the MFDO terminals. If
there is damage to the Safe Disable circuit, a controller (PLC or safety relay) must read this
signal as an input signal to hold the “Safe Torque Off” status. This will help verify the condition
of the safety circuit. Refer to the manual for the safety device for more information about the
Safety function.
It is possible to switch polarity of the Safety monitor output signal with the MFDO function
settings. Refer to Table 18.3 for setting instructions.
Keypad Display
If the two input channels are OFF (Open), the keypad will flash STo [Safe Torque OFF].
If there is damage to the Safe disable circuit or the drive, the keypad will flash SToF [Safe
Torque OFF Hardware] when one input channel is OFF (Open), and the other is ON (Short
circuit). When you use the Safe disable circuit correctly, the keypad will not show SToF.
If there is damage to the drive, the keypad will show SCF [Safety Circuit Fault] when the drive
detects a fault in the Safe disable circuit. Refer to the chapter on Troubleshooting for more
information.