Wiring Precautions; Safety Stop Function (Standard Model / Ethernet Model) - Mitsubishi Electric 800 Series Instruction Manual

2.6.6

Wiring precautions

• It is recommended to use a cable of 0.3 to 0.75 mm
• The wiring length should be 30 m (200 m for terminal FM) at the maximum.
• Do not short across terminals PC and SD. Doing so may cause an inverter failure.
• Use two or more parallel micro-signal contacts or twin contacts to prevent contact faults when using contact inputs since
the control circuit input signals are micro-currents.
Micro signal contacts
• To suppress EMI, use shielded or twisted cables for the control circuit terminals and run them away from the main and
power circuits (including the 200 V relay sequence circuit). For the cables connected to the control circuit terminals,
connect their shields to the common terminal of the connected control circuit terminal. When connecting an external power
supply to terminal PC, however, connect the shield of the power supply cable to the negative side of the external power
supply. Do not directly earth (ground) the shield to the enclosure, etc.
• Always apply a voltage to the fault output terminals (A, B, and C) via a relay coil, lamp, etc.
2.6.7 Safety stop function (Standard model / Ethernet
model)
 Function description
The terminals related to the safety stop function are as follows.
Terminal
symbol
*1
Input terminal as the safety stop channel 1.
S1
*1
Input terminal as the safety stop channel 2.
S2
*1
Common terminal for S1 and S2.
PC
Output terminal used for fault detection and fault indication
display.
SO
The terminal is ON (conducted) while no internal safety circuit
*2
failure exists.
SOC Open collector output (terminal SO) common
*1 In the initial status, terminals S1 and PC and terminals S2 and PC are respectively shorted with shorting wires.) To use the safety stop function,
remove all the shorting wires, and then connect to the safety relay module as shown in the connection diagram.
*2 When any fault listed on the next page occurs in the internal safety circuit, the corresponding indication is shown on the operation panel.
NOTE
• Terminal SO can be used to display a fault indication and to prevent restarting of the inverter. The signal output from terminal
SO cannot be used to input a safety stop signal to other devices.
56
2. Installation and Wiring
2.6 Control circuit
Twin contacts
2
for the connection to the control circuit terminals.
Terminal function description
Status of both the circuit between terminals S1 and PC and the
circuit between terminals S2 and PC
Open: Safety stop is activated.
Shorted: Safety stop is not activated
OFF: Internal safety circuit fault
ON: No internal safety circuit fault
*2
*2