Mitsubishi Electric MEsoftstart/I01 Users, Installation & Instruction Manual page 40

Wiring terminal X3 (Pro) – Communications and Control inputs
The green wiring terminal X3 on the top side of the soft starter (refer Figure 19) provides access to the wiring terminals for the
PC Interface and is where the Auto/Maintenance, remote start and reset signals to the soft starter, should be connected.
Table 14: Communication and Control I/O wiring terminals on the Pro models
Terminal Terminal name
X3-1
RS-485 A and -B
X3-2
X3-3 RS-485 Ground
X3-4 Over Alarm
X3-5 Over Alarm Return
X3-6 Fault / Incoming Alarm
Fault / Incoming Alarm
X3-7
Return
X3-8 Auto / Maintenance
X3-9 Return
X3-10 Remote Start
40 Wiring
Terminal function description
Communication port for control expansion. Two wire RS485-A and RS485-B terminals. Functionality to be
defined.
Output: Motor overload alarm. This output is activated when the measured current is higher than the
frame size or higher than the Motor Overload Current (MOLC) parameter in the configuration.
Output: This is a configurable output and can be set to either be an indication of 3 phase power present
in the soft starter OR a fault detected by the soft starter.
The Fault output is reset when the user presses RESET on the TFT or via the PC interface or remote reset.
Input: Auto / Maintenance. When this signal is active the Soft starter is in 'Auto' and control will be
possible from any remote location via RTU, TCP, PLC discrete inputs AND the TFT or Pot HMI on the
box. When this signal is not active the Soft starter is in 'Maintenance' and the control will be possible
from local location only i.e. via TFT or Pot HMI.
NOTE that this is a normally-closed switch connection. If not used the terminals must be
bridged or the soft starter will be in Maintenance.
This is the return signal for Auto/Maintenance input AND Remote Start input.
Input: When the soft starter is configured for 'REMOTE' control, this input will start the soft starter.
This is an input signal to the soft starter and may be used to remotely start the motor from e.g. a PLC
controller. The controller should use the Ready Relay output (refer Table 12 X1-1 and X1-2) to be able
to detect when the soft starter is ready to start the motor.
NOTE that the system must be configured for REMOTE operation (refer paragraph 6.7.1).
Close this contactor to start the motor, open it to Stop the motor.
Figure 26 – Terminal X3 (Pro) – wiring example