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Error
No.
Description
Led Indications
LED1
LED 2
LED4
Internal failure Reason
Action
Status of LED 1 and LED2 depends on safety
function state assigned to DI1 and DI2
Green
constant
74
Internal failure
MCB 150/151
•
First, power cycle
the frequency
converter or restart
the option by
42-90 Restart Safe
Option
.
•
If the problem
persists, contact
Danfoss
Red constant
75
Int Fail DI2 in
PUST: Reaction
STO
•
Safety input connected
to DI2 has illegal
signal level.
•
Sensor is broken
•
Check that configu-
ration of DI2
42-21 Type
parameter is set
correctly or that
the connected
sensor is installed
according to
specification.
•
Extend discrepancy
time on safe input
tab in MCT 10 safe
plug-in
14-22 Operation
Mode
.
Red constant
76
Int Fail DI1 in
PUST: Reaction
STO
•
Safety input connected
to DI1 has illegal
signal level.
•
Sensor is broken
•
Check that the
configuration of
DI1 (
42-21 Type
sub
index [0] is set
correctly or the
connected sensor
is installed
according to
specification.
•
Extend discrepancy
time on safe input
tab in MCT 10 safe
plug-in
14-22 Operation
Mode
.
Red constant
77
Int Fail failsafe
data CRC
mismatch:
Reaction STO
The CRC of the safety
option does not match
the stored CRC value on
the frequency converter.
Configure the safety
option with MCT 10
safe plug-in or by CRC
select/LCP copy
Red constant
Warnings and Alarms
Operating Instructions
MG34W302
Danfoss A/S © Rev. 2014-02-11 All rights reserved.
63
8
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Summary of Contents for VLT Safety Option MCB 150
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