Input Terminals - Mitsubishi Electric 800 Series Instruction Manual

4.2

Input terminals

Use the following safety parameters to select or change functions of terminals SX1 and SX2.
Pr. Name
S051 SX1/SX2 terminal function
selection
S061 SX1/SX2 terminal filtering
time
S066 SX1/SX2 terminal
mismatch permissible time
 Redundant input wiring
• Signals having the same function are input via terminals SX1 and SX2 with double wiring redundancy. The inverter
constantly verifies that the ON/OFF logic of the two input signals are consistent with each other to detect input faults. Use
Pr.S066 to set a time period during which a mismatch between the two input signals is allowed.
• When the two signals are still inconsistent for the time period set in Pr.S066 or longer, "E.SAF" (fault detail code 54) is
displayed. The following diagram shows an example of input mismatch fault detection.
Terminal SX1
Terminal SX2
 Self-diagnosis with test pulse signals
• Fault diagnosis of the input circuit is performed while the input signals are ON by inputting test pulse signals to temporarily
turn OFF the input signals.
• When a fault is detected, "E.SAF" (fault detail code 49) is displayed.
 Input terminal filter
• This function enables setting a time period to eliminate noises of input signals or test pulses from external devices.
• Set the time from when the signal is input until the inverter starts actual operation in Pr.S061. When test pulse signals are
superposed on input signals, consider the time required for turning OFF the test pulse signals.
• A longer filtering time is more effective for chattering prevention and noise elimination, but causes a delay in the response
of input terminals.
• Refer to the following table to set the filtering time.
Including switches or other devices without diagnosis function
Including devices with diagnosis function
NOTE
• The Pr.699 Input terminal filter is not applicable to terminals SX1 and SX2.
Initial Setting
value range
0 0, 6 0: No function
6: Brake feedback (SBCFB) signal
0.01 s 0.01 to 0.1 s Set the time from when the signal is input until the inverter starts
actual operation.
0.2 s 0 to 2 s Set a mismatch permissible time for redundant input signals.
Setting "0" disables detection of the input mismatch fault.
Pr.S066
ON
ON
ALM
Configuration
Test pulse signals superposed on device output signals
Test pulse signals not superposed on device output signals
Description
Pr.S066
ON
E.SAF
STO state
4 ms or more
Time required for turning
OFF device test pulse
signals plus 4 ms or more
4 ms or more
4. I/O Signals for Safety Sub-Functions
3
4
5
4
5
6
7
8
9
10
Filtering time
19
4.2 Input terminals