Deif PPU 300 - 13. Troubleshooting Guide; Troubleshooting Introduction; Troubleshooting with SWBD Control

13. Troubleshooting
13.1 Introduction
13.1.1 Finding the source of the problem
For some system problems, the controller activates an alarm. The operator may therefore think that there is a problem with the
controller, even though the actual problem is in the system.
It is not possible to describe every possible system problem. Troubleshooting requires an understanding of the system, a logical and
systematic approach, and careful observation of the system reactions to the troubleshooting actions.
This chapter describes using switchboard control for troubleshooting, as well as troubleshooting for some of the most common
alarms.
More information
See the Designer's handbook for more information regarding alarms.
More information
See Troubleshooting in the Commissioning guidelines for troubleshooting regulators and terminal damage.
13.2 Using SWBD control for troubleshooting
13.2.1 Introduction to SWBD control
The exact procedure for operating the system under SWBD control depends on the switchboard design. Follow the guidelines from
the switchboard supplier when operating the system under switchboard control. Class societies require that certain minimum
protections are included in the switchboard. For example, there must be a synchronisation check before closing a breaker.
DANGER!
Only trained operators should operate the system under switchboard control. Even though the controller protections are
active, the operator can create undesirable conditions during switchboard control. The operator actions can also disrupt the
power supply.
13.2.2 Troubleshooting the system under SWBD control
Problem
Any unexpected behaviour or situation in the system.
Solutions Make sure that the problem is not from the controller.
Tools Switchboard inputs and switchboard instruments.
Before you start
As far as possible, ensure that the system will be able to supply the required power while the controller is under SWBD control.
General information about SWBD control
When you place a controller under SWBD control, the controller stops controlling the GOV and AVR regulators. All logic for the
genset (start and stop) and breaker (open and close) is deactivated. The controller's protections remain active.
DANGER!
During SWBD control, the controller protections will respond to alarm situations. However, the controller will not prevent
you from creating alarm situations.
OPERATOR'S MANUAL 4189341099G UK Page 123 of 130