Print Date 12/05/15 Page 31 of 32 S7600-00MA-08
3.4 AUTOMATIC CONTROL
The E2023 Controller Unit also enables various forms of automatic control such as dual Exciter/Drive
changeover, muted/reduced power operation etc. or any normal combination of them.
For dual Exciter/Drive changeover, the E2024 AUTO – SELECT A – SELECT B switch must be set to
AUTO. For muted/reduced power operation, the AUTO – MUTE – START switch must be set to
AUTO.
3.4.1 Exciter/Drive Control and Monitoring
When dual Exciter/Drives are connected to the E2023, to enable monitoring and set-up, press [MODE]
then the soft key on the horizontal row beneath ‘Drives’ on the LCD display. (note that a single
Exciter/Drive can also be monitored or controlled in this way).
The LCD display will then indicate which Exciter/Drive is selected and will indicate whether it is
‘normal’ or ‘fail’. If the other Exciter/Drive is passive (i.e. in a muted state) the display will show ‘????’
By pressing the soft key beneath ‘Act/Pas’ the non-selected Exciter/Drive can be toggled between
muted (passive) or demuted (active). This choice can also be made using remote control.
When the E2024 AUTO – SELECT A – SELECT B switch is set to SELECT A or SELECT B (i.e
manual control), the top row of the display shows which Exciter/Drive A or B would be preferred or
forced when AUTO control is later selected. A or B can be selected using the soft keys, the rear panel
inputs or remote control.
When the E2024 AUTO – SELECT A – SELECT B switch is set to AUTO, the top row of the display
shows the number of automatic changeovers (0 to 4) since it was last reset. Exciter/Drive A or B can
again be preferred or forced by using the soft keys, the rear panel inputs or remote control.
Any such control action resets the automatic changeover counter to zero, the ‘0’ flashing for
approximately 30 seconds to indicate that no actual changeover can take place during this ‘settling’
period. An automatic changeover can then occur if the selected Exciter/Drive fails (by either a
continuous ‘fast’ status failure for 2 seconds or a continuous ‘slow’ status failure for 10 seconds). If the
non-selected Exciter/Drive is ‘passive’ the changeover will always take place. If the non-selected
Exciter/drive is ‘active’ the changeover will only occur if it is registered as not failed. A changeover will
increment the counter, the new displayed number again flashing for approximately 30 seconds to
indicate that no further changeover can take place during this new ‘settling’ period. If the originally
selected Exciter/Drive then becomes ‘good’ again (by both ‘fast’ status and ‘slow’ status being
continuously ‘good’ for 2 seconds) it will not be automatically re-selected unless the newly selected
drive itself fails.
Changeovers can occur up to 4 times, after which any further changes are prohibited until the counter
is automatically reset to zero after a period of about one hour after the final changeover (or sooner by
manual local or remote intervention).
To display the output power again, press [MAIN] as previously described.
3.4.2 Muting and Reduced Power Operation
When muting or reduced power control is required, to enable monitoring and set-up, press [MODE]
then the soft key on the horizontal row beneath ‘Power’ on the LCD display.
The LCD display will then indicate the various muting and high/low power settings available (automatic
local/ remote, manual and external). The four soft keys below the LCD display allow local selection of
the MUTE/START and HIGH/LOW (power) settings used when AUTO control is selected. These
settings can also be made using remote control. To allow the system to settle, any such control action
also resets the automatic Exciter/Drive changeover counter to zero and prevents any changeover for a
period of 30 seconds (see section 3.4.1).
