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Presys Instruments
LATCHED - configures the relay to be deactivated only after the end of the
alarm condition and the operator has performed the acknowledge of this alarm. The
acknowledgment of the alarm condition is performed within the normal operation
mode by pressing the ACK key until it is shown the mnemonic corresponding to the
relay one is looking for. Note that it will be shown only the relays configured with latch
operation which require acknowledgment in order to return to normal state. After
reaching the relay, press the ENTER key. If there is no alarm condition for this relay,
it will change its state. Continue pressing the ACK key to return to operation mode.
The LATCHED option is also allowed for leds. When the latched function is
enabled for a led and the channel to which the led is associated enters in alarm
condition, the led is turned on and remains in this state even after the alarm condition
is over. In order to turn the led off, one must press ACK when in operation level,
choose the mnemonic corresponding to the led and press ENTER. Continue pressing
the ACK key to return to operation mode.
RST - it allows the relays to be deactivated even when the alarm condition
which activated these relays is still present (relay reset).
In order to deactivate a certain relay with RST function enabled, one must
press ACK when in operation level, and choose the mnemonic corresponding to the
activated relay by pressing ENTER. Continue pressing the ACK key to return to
operation mode.
The relay will be activated again if the current alarm condition finishes and
then returns, or in case of occurrence of other alarm conditions which were not
presented before.
DELAY - causes the relay to be activated only after a certain time interval
defined by the user. Figure 17 below illustrates the delay operation for a high-alarm.
SAFE - provides safety to relays. The safety condition means the relays are
powered on when the instrument is on and there is no alarm condition, and the relays
are powered off when in alarm condition or in case of power failure.
Operation
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Fig. 17 - Relay with delay
DMY - 2015
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