YASKAWA GA700 Technical Manual page 227

Place one short circuit between terminals H1-HC and one between terminals H2-HC to disable "Safe Torque
Off" when the Safe Disable function is triggered during stop. Enter the Run command after the drive stops
normally.
• During run:
Place one short circuit between terminals H1-HC and one between terminals H2-HC to disable "Safe Torque
Off" after clearing the Run command when the Safe Disable function is triggered during stop. Enter the Run
command after entering the STOP command regardless of whether terminals H1 and H2 are ON.
■
Safe Disable Monitor Output Function and Keypad Display
Refer to Table 4.24 for information on the relationship between each status of the input channel, Safety monitor
output, and drive output.
Input Channel Status
Input 1 Input 2
(H1 - HC) (H2 – HC)
ON ON
(Short circuit) (Short circuit)
OFF ON
(Open) (Short circuit)
ON OFF
(Short circuit) (Open)
OFF OFF
(Open) (Open)
Safety Function Status Monitor
The drive Safety monitor output sends a feedback signal regarding the Safety function status. The Safety monitor
output is one of the possible settings available for the multi-function digital output terminals. A controller (PTC or
safety relay) must read this signal as an input signal to maintain the "Safe Torque Off" status in the event that the
Safe Disable circuit is damaged. Refer to the manual for the safety device for more information on the Safety
function.
It is possible to switch polarity of the Safety monitor output signal using the multi-function digital output
functions settings. Refer to
Keypad Display
The keypad will flash STo [Safe Disable Signal Input] when both input channels are OFF (Open).
The keypad flashes SToF [Safe Disable Signal Fault] when one input channel is OFF (Open), and the other is ON
(Short circuit) to indicate that either the Safe disable circuit or the drive are damaged. The keypad will never
display SToF when the Safe disable circuit is used correctly. Refer to the chapter on Troubleshooting for more
information.
The keypad displays SCF [Safe Circuit Fault] when the drive detects a fault in the Safe disable circuit to indicate
that the drive is damaged. Refer to the chapter on Troubleshooting for more information.
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Validating Safe Disable Function
Perform the following Safe Disable input test when replacing parts or performing maintenance after completing
all necessary wiring to start the drive. Keep a record of the test results.
• Ensure that the keypad flashes STo [Safe Disable Signal Input] when both input channels are OFF (Open) and
confirm that the motor is not running. Also check that the motor is not running.
• Monitor the ON/OFF status of the input channels and ensure that multi-function digital output assigned to the
EDM function operates as shown in
The ON/OFF status of the multi-function digital output may not display correctly on the keypad if one or more
of the following are true:
– Incorrect parameter settings
– A problem with an external device
– There is a short or disconnection in the external wiring.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Table 4.24 Safe Disable Input and EDM Terminal Status
Safety Monitor Output
Multi-function Multi-function
Digital Output Digital Output
Terminal
(H2-xx = 21) (H2-xx = 121)
OFF
OFF
OFF
ON
Table 4.24 for setting instructions.
Table 4.24.
Drive Output
Status
Terminal
Baseblock
ON
(Drive ready)
Safety status
ON
(STo)
Safety status
ON
(STo)
Safety status
OFF
(STo)
4.4 Safe Disable Input
LED Status
Keypad Display
Ring
Normally
Ready: Lit
displayed
SToF
ALM/ERR:
Flashing
(Flashing)
SToF
ALM/ERR:
Flashing
(Flashing)
STo
Ready: Flashing
(Flashing)
4
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