Troubleshooting Guide; What This Chapter Contains; Fault Treatment Procedure - ABB PQFS Installation, Operation And Maintenance Instructions

11 Troubleshooting guide

11.1 What this chapter contains

This chapter presents the troubleshooting guide for the active filter. The filter fault
treatment procedure is described. Also, an overview of possible errors is given. Finally,
recommendations are made on how problems may be resolved.
WARNING: All troubleshooting and repair work described in this chapter should
only be undertaken by a qualified electrician. The safety instructions presented in
Chapter 2
WARNING: High AC and DC voltages may be present in the filter enclosure. Do not
open the panel and touch any filter parts unless you have ascertained that they do
not carry dangerous voltage levels.
WARNING: Under no circumstances close the main contactor manually. Failure to
adhere to this guideline may result in physical injury and/or in filter damage.
WARNING: Some checks may have to be made with the supply on and the filter
protective cover removed. These tests must be carried out only by authorized and
qualified personnel, in accordance with the local regulations. Apply the safety
guidelines that are presented in
guidelines may result in lethal physical injury.

11.2 Fault treatment procedure

All faults that occur are stored in the filter event log and are analyzed by the filter
controller. The event log is of the circular type and can store up to 200 events. It can be
accessed through [/Welcome/PQF Monitoring/Event logging]. Background information on
the event logging display is given in
A fault can either be non-critical or critical.
Depending on the type of critical fault and the number of occurrences, the filter, when
running, may either:
150 Troubleshooting guide ç Manual Power Quality Filter PQFS
of this manual must be strictly adhered to.
· A non-critical fault is a transient fault (e.g. a voltage spike). When a non-critical
fault occurs the filter may stop the switching of the IGBTs momentarily (< 40 ms)
but they will automatically restart. The only way to pick up this type of fault is to
analyze the event log. Given the transient/random character of this type of fault,
the filter performance will hardly deteriorate when it occurs.
· A critical fault is a fault that after occurrence cannot be successfully automatically
cleared by the system within a reasonable time. The time frame considered
depends on the error type. If the fault is considered critical by the system, the
label 'Critical' will be shown in the event logging window. In addition, the PQF
item in the PQF-Manager 'Welcome' screen will display the label 'ACK. FAULT.
Note however that if the fault disappears fast, this label disappears too.
Chapter 2. Failure to adhere with the safety
Section 7.8.3.