Delta MH300 Series User Manual

Chapter 17 Safe Torque Off FunctionMH300
17-9
17-7 Fault Codes and Troubleshooting Instructions
17-7-1 Fault Code Description
Refer to Pr.06-17–Pr.06-22 for the fault record; the relevant STO error code is 72 / 76 / 77 / 78. The
definition is as follows and in Table 4.
06-17
Fault Record 1
06-18
Fault Record 2
06-19
Fault Record 3
06-20
Fault Record 4
06-21
Fault Record 5
06-22
Fault Record 6
Display
72: Channel 1 (S1–DCM) safety loop error (STL1)
76: Safe Torque Off (STo)
77: Channel 2 (S2–DCM) safety loop error (STL2)
78: Internal loop error (STL3)
Fault code Name Description
76 (STo) Safe Torque Off Safe Torque Off function active
72 (STL1)
Channel 1 (S1–DCM)
safety loop error
S1–DCM internal loop detection error
77 (STL2)
Channel 2 (S2–DCM)
safety loop error
S2–DCM internal loop detection error
78 (STL3) Internal loop error
S1–DCM and S2–DCM internal loop
detection error
Table 17-4 Fault code description
17-7-2 Troubleshooting Instructions
Refer to the following instructions for troubleshooting when STO / STL1 / STL2 / STL3 appears on
the keypad. Refer to Chapter 14 Fault Codes.
ID No.
KPMH-LC01
Display
Descriptions
72
S1–DCM internal loop detection error
Possible cause and corrective actions

The short-circuit wire of S1 and DCM does not connect.
 Re-connect the short-circuit wire
 Hardware failure
After you make sure all the wiring is correct, if STL1 fault still
exists after cycling the power, contact with Delta.
76
Safe Torque Off function active
Possible cause and corrective actions

The switch of S1 / DCM, S2 / DCM act (OPEN: open loop)

Reset the switch (ON: conducting) and cycle the power

Delta MH300 Series Specifications

General

Brand	Delta
Model	MH300 Series
Category	DC Drives
Language	English