Emergency Stop Observation - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual
12 Appx. 3: Protection Function

12.2 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.
(a) Connection
Mitsubishi NC
OPTH1
EMG
External emergency stop input
(24VDC)
(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 (CN9B).
2. To provide double-protection when an emergency stop occurs, the emergency stop input of NC and the external
emergency stop input of drive unit are always wired from same emergency stop switch.
3. The external emergency stop function is a function which helps the NC emergency stop.
MDS-E/EH-V1/V2/V3/SP/SP2
Emergency
stop
Alarm
CN1A
Optical
communication
CN4
G380 cable
External emergency
stop switch
MDS-E/EH-CV
Emergency
stop
Alarm
CN4 CN23
SH21 cable
CN24
1A EMG2
4A EMG1
485
3 MC2
Contactor shutoff
2 (NC)
command
1 MC1
IB-1501229-F