8 Warnings and Alarms
8.1 Fault Types and Messages
This chapter provides troubleshooting tables for diagnosing fault conditions associated with the safety option.
The safety option differentiates between the fault types shown in
.
Fault type
Description
Effect on the system
Reset condition
Fatal Error
Severe exceptional error caused by the program run
in the safety option. Cyclic program sequence is no
longer possible for safety related reasons. The last
active function is displayed. The system is in stop
mode.
Output S37 is switched off
Reset possible by power
cycling the frequency
converter or restart the safety
option via
42-90 Restart Safe
Option
Alarm
Functional fault, caused by an external process. Both
systems continue to run cyclically and serve all
requests from the communication interfaces. Sensing
of the external process is also maintained.
Output S37 is switched off!
Reset possible via parameter-
izable input DI2, reset on
LCP/DI or via Field bus or via
42-90 Restart Safe Option
Table 8.1 Fault Types
Colour Mode
Description
Green Flashing
System OK, configuration validated
Green Permanent System OK, input or output activated
Yellow Flashing
System OK, configuration not yet validated
Red
Flashing
Alarm
Red
Permanent Fatal error
Table 8.2 LED Status Indicators
All external failures can be removed by giving a reset
signal (via LCP, DI2a and digital inputs on control card or
via fieldbus depending on configuration). All internal
failures can be removed by power cycle,
42-90 Restart Safe
Option
and configuration.
8.1.1 Messages
Any errors on the safety option are indicated on the
frequency converter display with different messages
The following options are available for detailed diagnostics
and fault detection
•
LEDs on the front of the safety option provide
information on operating states. The LEDs are
used to indicate the status of the option, i.e.
active safety functions, failures and warnings, if
any.
•
LCP text or info via bus display the status of the
safety functions (e.g. SS1a).
The following are displayed in online mode in the MCT 10
Set-up Software
•
Status of the safety option input and output
errors, messages and the corresponding remedies
are displayed in the expanded diagnostics system
of MCT 10 Set-up Software.
Warnings and Alarms
Operating Instructions
60
Danfoss A/S © Rev. 2014-02-11 All rights reserved.
MG34W302
8
8
Summary of Contents for VLT Safety Option MCB 150
Page 2: ......
