
10. EMERGENCY STOP SIGNAL
B–64113EN/01
256
To configure an emergency stop circuit in compliance with JIS safety
standards(*), observe the following cautions. Compliance with these JIS
safety standards is a prerequisite for complying with the EC Machine
Instructions.
The method for shutting off the motor power section in the amplifier is
based on an IGBT (transistor) rather than an electromechanical scheme.
When configuring an emergency stop circuit, therefore, install a line
contactor on the power input line for motor power in the power supply
module in order to ensure electromechanical shut–off, and apply voltage
to the control coil of the contactor via the contactor control output of the
power supply module.
A failure in the amplifier may disable the output relay of the power supply
module from going off, thus preventing the line contactor from shutting
off the power, even when the emergency stop command input (*ESP) of
the amplifier becomes low.
To secure motor power shut–off, design the emergency stop circuit in a
redundancy configuration. To be specific, the emergency stop circuit
must have a direct line contactor shut–off route based on an emergency
stop switch that is independent of the shut–off function of the amplifier.
If a spindle amplifier module is used, shutting off the motor power line
during spindle rotation disables the spindle from stopping quickly
because the power regenerative function does not work, allowing the
spindle to coast. So, provide the redundancy circuit mentioned above
with a delay function based on an off–delay timer that allows a usual stop
time.
Refer to the following material for detailed descriptions about cautions
related to safety circuits.
A–71429–S13J: About Requirements for Safety Circuits and
Configuration Samples
To get a copy of this material, contact your FANUC sales representative.
NOTE
Examples of important safety standards. Enclosed in
parentheses are corresponding European standards.
JIS/TR B 008 and 009 (EN292–1/2)
General matter related to machine safety
JIS B 9960–1 (EN60204–1) Stop categories
JIS B 9705–1:2000 (EN954–1) Safety categories
JIS B 9703:2000 (EN418) Emergency stop
Cautions for config-
uring an emergency
stop circuit in com-
pliance with safety
standards