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MDS-D2/DH2 Series Instruction Manual
3.2 Emergency Stop Observation
3.2 Emergency Stop Observation
The double-protection for the emergency stop signal is provided and observes whether any abnormality is found in the
emergency stop signal. The whole system will be in the emergency stop state when one emergency stop signal is in
open state.
(1) Input circuit of an external emergency stop
Besides the emergency stop input from the NC controller, double-protection when an emergency stop occurs can
be provided by directly inputting an external emergency stop to the CN24 connector on the power supply unit. Even
if the emergency stop is not input from CNC for some reason, the contactors will be shut off by the external
emergency stop input from CN24 connector on the power supply unit. When the external emergency stop input and
contactor are installed, compliance with "EN60204-1 category1" is basically possible.
(a) Connection
(b) Rotary switch setting
When using the external emergency stop, the rotary switch on the front of the power supply unit must be set.
- Rotary switch setting: 4
CAUTION
1. The emergency stop signal input to the CNC side cannot be used as a substitute for the external emergency stop
function.
2. To provide double-protection when an emergency stop occurs, the emergency stop input of NC and the external
emergency stop input of power supply unit are always wired from same emergency stop switch.
3. The external emergency stop function is a function which helps the NC emergency stop.
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.
CN1A
CN4
CN4
1A EMG2
4A EMG1
CN23
CN24
OPT1
3 MC2
2
(
NC
)
1 MC1
EMG
MDS-D2/DH2-V1/V2/V3/SP/SP2
MDS-D2/DH2-CV
SH21 cable
(24VDC)
External emergency
stop switch
External emergency stop input
Mitsubishi NC
G391 cable
Alarm
Emergency
stop
Optical
communication
Emergency
stop
Alarm
Contactor shutoff
command