DSE Model 7560 ATS and Mains Controller Operators Manual
44 057-017 7560 OPERATING MANUAL ISSUE 10.2 10/02/09 AM
7.3 ROCOF / VECTOR SHIFT
When configured to run in parallel with the mains (utility) supply, the module monitors for ROCOF /
Vector shift trips according to the module’s configuration settings. This is included within the module
and will detect failure of the mains supply during parallel operation with the generator.
NOTE:- This protection operates only when in parallel with the mains supply and is
disabled at all other times.
Should either of these alarms operate, the module will perform either a controlled shutdown
(electrical trip) of the generator or will instigate the mains failure function. This operation must be
manually reset :
1) Press
button. The engine will stop if it is still running and the alarm is cleared.
2) Activate digital input configured to “Clear ROCOF/Vector shift” if this has been provided.
3) Press
and
button together and hold for 5 seconds. The ROCOF/Vector shift
instrument is displayed and all ‘peak hold’ values are reset, clearing the ROCOF/Vector shift
alarm.
For details on activating and configuring the ROCOF/Vector shift protection you are referred to the
75xx for Windows configuration software manual.
7.3.1 MAINS DECOUPLING TEST MODE
To aid the testing of the mains decoupling features in the controller, a special test mode is included.
This is activated by placing the module into STOP mode and enabling the ‘test mode’ in the module’s
front panel ‘running editor’, described elsewhere in this document.
This allows a ‘one shot’ test of the mains decoupling protection, enabling the Test Engineer to inject
the necessary test signals into the DSE control and timing the reaction from application of the signal
to activation of a DSE output configured to ‘combined mains decoupling’.
The actual testing of mains decoupling must be left to experienced engineers and is outside the
scope of DSE support.
