Danfoss VLT MCB 150 Operating Instructions Manual page 64

Warnings and Alarms
Error
No. Description
Internal failure
70 Int fail speed
limit SLSa :
Reaction STO
71 Int fail speed
limit SLSb :
8 8
Reaction STO
72 Internal failure
MCB 150/151
73 Internal failure
MCB 150/151
62
Operating Instructions
Reason Action
•
Happens during ramping to
SLS limit, see 68.
Happens during speed below
SLS limit:
•
If speed is above cut-off
•
speed at activation point
and 42-53 Start Ramp is set
to "No", this error occurs.
•
Noise on the feedback
signal (incl. quantisation
noise) is larger than
expected.
•
Load change takes place,
do as in above point)
See 70 See 70
•
•
•
•
Danfoss A/S © Rev. 2014-02-11 All rights reserved.
Led Indications
LED1
Change 42-53 Start
Ramp to "Yes" and
set 42-54 Ramp Down
Time accordingly.
Increase 42-50 Cut Off
Speed or decrease
42-51 Speed Limit to
get a larger tolerance
First, power cycle the
frequency converter
or restart the safety
Status of LED 1 and LED2 depends on
option by
safety function state assigned to DI1
42-90 Restart Safe
Option. Secondly, try
to make a general
reset of the safety
option with the
"Administration"
button (safety option
goes back to blank
initial state)
If the problem
persists, contact
Danfoss
First, power cycle the
frequency converter
or restart the safety
option by
42-90 Restart Safe
Option.
If the problem
persists, contact
Danfoss
LED 2 LED4
Green
constant
Red constant
Red constant
Red constant
and DI2
Red constant
MG34W302