Error
num‐
ber
Description LED indications
90 Internal er-
ror: Memory
error S1.
Reaction:
STO.
Severe excep-
tional error
caused by the
program run
in the safety
option.
Perform 1 of the follow-
ing actions:
• Power cycle the
drive.
• Restart the safety op-
tion via parameter
42-90 Restart Safe Op-
tion.
• If the problem per-
sists, contact Dan-
foss.
Status of LED1 and LED2 de-
pends on the safety unction
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.
91 Internal er-
ror: Under-
voltage Vuc2
PLL.
Reaction:
STO.
92 Internal er-
ror: Overvolt-
age Vuc2
PLL.
Reaction:
STO.
93 Internal er-
ror: Under-
voltage Vuc2
Core.
Reaction:
STO.
94 Internal er-
ror: Overvolt-
age Vuc2
Core.
Reaction:
STO.
95 Internal er-
ror: Under-
voltage Vuc2
SDRAM.
Reaction:
STO.
96 Internal er-
ror: Overvolt-
age Vuc2
SDRAM.
Reaction:
STO.
Maintenance, Diagnostics, and
Troubleshooting
Installation Guide | VLT®Safety Option MCB 152
AN327351953089en-000101 / 130R0578
66 | Danfoss A/S © 2020.02