Error
num‐
ber
Descrip‐
tion
LED indications
72 Internal er-
ror: Pro-
cessor er-
ror.
Reaction:
STO
– Perform 1 of the following
actions:
• Power cycle the drive.
• Restart the safety option
via parameter 42-90 Re-
start Safe Option.
• If the problem persists,
contact Danfoss.
Status of LED1 and LED2 de-
pends on the safety function
state assigned to DI1 and DI2.
If safe fieldbus
is enabled, the
status of LED3
depends on the
safe fieldbus
status. Other-
wise, LED3 is
off.
Red
con-
stant.
73 Internal er-
ror: Safe
output
switch 1.
Reaction:
STO
74 Internal er-
ror: Safe
output
switch 2.
Reaction:
STO
75 Internal er-
ror: DI2 in
PUST.
Reaction:
STO
• Safety
input
connec-
ted to
DI2 has
illegal
signal
levels.
• Sensor
is bro-
ken.
• Check that the configu-
ration of DI2, parameter
42-21 Type, is set correct-
ly or that the connected
sensor is installed ac-
cording to specification.
• Extend the discrepancy
time on the safe input
using the VLT® Motion
Control MCT 10 Safe
Plug-in.
76 Internal er-
ror: DI1 in
PUST.
Reaction:
STO.
• Safety
input
connec-
ted to
DI1 has
illegal
signal
level.
• Sensor
is bro-
ken.
• Check that the configu-
ration of DI1 (parameter
42-21 Type, sub-index
[0]) is set correctly or
that the connected sen-
sor is installed according
to specification.
• Extend the discrepancy
time on the safe input
using the VLT® Motion
Control Tool MCT 10
Safe Plug-in.
Maintenance, Diagnostics, and
Troubleshooting
Installation Guide | VLT®Safety Option MCB 152
AN327351953089en-000101 / 130R0578
62 | Danfoss A/S © 2020.02
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