Filter
Top Products
3 - 7
MDS-D2/DH2 Series Instruction Manual
3.2 Emergency Stop Observation
[2] Example of emergency stop circuit
The following diagram shows an example of the emergency stop circuit (EN60204-1 Category 0) in which an
off delay timer (TM1) is installed as a power shutoff method independent from the NC emergency stop input.
The required safety category may be high depending on the machine and the Safety Standards may not be
met. Thus, always pay special attention when selecting the parts and designing the circuit.
Provide a mechanism that shuts off the power even if the CNC system fails.
POINT
Stop Categories in EN60204-1
Category 0: The power is instantly shut off using machine parts.
Category 1: The drive section is stopped with the control (hardware/software or communication network), and then the
power is instantly shut off using machine parts.
(Caution) Refer to the Standards for details.
Refer to Section 9.2.5.4.2 in EN60204-1: Safety of Machinery Electrical Equipment of Machines - Part 1.
TM1
GND
R
RA1
R
GND
EMG
CPU
&
ASIC
SV1/2
CN1A/B
CN24
GND
CPU
&
ASIC
CPU
&
ASIC
MBR*
CN4
CN4
L11
L21
L11
L21
MC1
CN20
MBR*
P
N
L1
L2
L3
MC
MC-OFF*
RA
MC2
R
NC Emergency stop
NC Emergency stop
NC Unit
Servo/Spindle
Drive Unit
Power Supply
Unit
External
Emergency
Switch
Motor
Brake
AC
Reactor
External
Contactor
Setting the off delay timer (TM1) time
Set the TM1 operation time so that it functions after it has been confirmed that
all axes have stopped.
If the set time is too short, a power supply alarm occurs, and the spindle motor
will coast to a stop.
tm ҈ All axes stop time