YASKAWA
TOMPC71061753A YASKAWA AC Drive GA500 Installation and Operation Instruction
37
Table 1.11 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
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.
