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PRESYS
Instruments
Levels 3 to 6 - Alarms
The indicator can have up to four physical devices for alarms: relays 1, 2, 3 and 4.
ALAR1, ALAR2, ALAR3 and ALAR4 mnemonics correspond to the configuration
levels for alarms 1 to 4, respectively. The connectors on the Power Supply Board for the
installation of each one of the relays are listed below:
Refer to section 4.3 on Optional Modules Installation for the installation details.
Each device can be configured as high (HI mnemonic), low (LO) or fail (FAIL)
alarm. The Fail alarm is activated when there is a sensor break, for inputs configured as
temperature (RTD or TC), 4-20 mA current or 1-5 V voltage. When configuring an alarm
as high or low is necessary to set its set point (SP) and hysteresis (HYST). There is no
configuration of these parameters for fail alarms.
Relays 3 and 4 may be configured as trip alarms for the temperature (RTD or TC),
4-20 mA current or 1-5 V voltage inputs, preventing the alarm to be activated in case the
sensor breaks or at the moment the sensor is reconnected. Trip alarms are enabled in
the GENERAL level by means of the TRIP mnemonic. To enable the trip function for
relay 3 or 4 (ALAR3 and ALAR4 options), select HI (high trip) or LO (low trip). To disable
the trip function, select ANNUL, so that the relay 3 or 4 works in the same way as
relays 1 and 2 do.
Once the trip type is selected, one must configure the parameters of the same
type of alarm (HI or LO) in the ALAR3 or ALAR4 level. Thus, if a high trip is selected, for
example, one must configure the high alarm (HI) and its parameters (SP and HYST).
When there is sensor break, the alarm of a trip relay ceases to be checked
temporarily (relay disabled), although it remains configured in the ALAR3 or ALAR4 level.
Right after the relay is disabled the state of the alarm is determined by the RL.F option
(shown after the selection of the alarm type). When configuring RL.F as RLS (release),
the relay is released from the alarm state of the input with the broken sensor (maintaining
the contact in the non-alarm position). When LAST is selected for RL.F, the relay
maintains the last alarm state presented by the input with the broken sensor. In this way,
for relay 3 with a high trip alarm and in alarm condition, for instance, the sensor break
would change the relay contact to the non-alarm position for RLS, while its position would
be maintained for LAST.
After the proper reconnection of the sensor to the input, one must apply a reset to
the disabled relay so that the instrument continues to check the alarm which was
disabled. The reset mode is defined by the RST.F option as automatic (AUTO) or
manual (MANU). RST.F is shown together with RL.F mnemonic after the selection of the
alarm type. For the automatic reset mode, the alarm relay is re-enabled as soon as the
instrument detects the sensor connection, while the manual reset mode requires the
operator to apply the reset in the operation level of the instrument. For the latter case,
Operation
Page 24
Relay
Board Connectors
MOD1 (Output 1)
1
MOD2 (Output 2)
2
MOD3 (Output 3)
3
MOD4 (Output 4)
4
DMY-2030-Light-5S-Energy
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