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3.8 Timers
3 Supporting functions
Technical description
124
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VM59.EN001
3.8.
Timers
The VAMP protection platform includes four settable timers
that can be used together with the user's programmable logic or
to control setting groups and other applications that require
actions based on calendar time. Each timer has its own
settings. The selected on-time and off-time is set and then the
activation of the timer can be set to be as daily or according the
day of week (See the setting parameters for details). The timer
outputs are available for logic functions and for the block and
output matrix.
Figure 3-3 Timer output sequence in different modes.
The user can force any timer, which is in use, on or off. The
forcing is done by writing a new status value. No forcing flag is
needed as in forcing i.e. the output relays.
The forced time is valid until the next forcing or until the next
reversing timed act from the timer itself.
The status of each timer is stored in non-volatile memory when
the auxiliary power is switched off. At start up, the status of
each timer is recovered.
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