Chromalox 1604-7 user manual Output, Alarms

Output level limiter:

-For one control medium: from 0 to 100 % .

-For two control mediums: from -100 to +100 %. This function may be operative at instrument start up for a programmable time (To avoid thermal shock and/or preheating the plant) otherwise it can be enabled by an external contact.

OUTPUT 1

Type: optoisolated 0-20 mA or 4-20 mA programmable.

Function: programmable as:

-control output (heating or cooling)

-retransm. of the measured value

-retransm. of the operative set point.

Scaling: programmable from -1999 to 9999.

Maximum load: 500 W. Resolution:

-0.1 % when used as control output.

-0.05 % when used as analog retransmission. Digital filter: it is possible to enable a digital filter, on the output retransmission, with the same time constant chosen for the read-out.

Output level indication (as control output only): from 00.0 to 100.0 %.

Output status indication: the indicator OUT 1 flashes with a duty cycle proportional to the output level.

OUTPUT 2

Type: relay SPST contact (NO or NC selectable by jumper).

Contact rated: 2 A at 250 V AC on resistive load.

Function: programmable as:

-control output (heating or cooling)

-Alarm 1 output

Output cycle time (when used as control output) programmable from 1 s to 99 s.

OUTPUT 3

Type: relay with SPST contact with rated current 2 A at 250 V AC on resistive load.

Function: programmable as:

-control output (heating or cooling)

-Alarm 2 output.

Output cycle time (when used as control output) programmable from 1 s to 200 s.

ALARMS

Actions: Direct or reverse acting.

Alarm functions: each alarm can be configured as process alarm, band alarm or deviation alarm. Alarm reset: automatic or manual reset programmable on each alarm.

Stand by (mask) alarm: each alarm can be configured with or without stand by (mask) function.

This function allows to delete false indication at instrument start up and/or after a set point change.

Process alarm:

Operative mode : High or low programmable.

Threshold : programmable in engineering unit within the input span.

Hysteresis: programmable from 0.1 % to 10.0 % of the input span (P4 - P3), or 1 LDS.

Band alarm:

Operative mode: Inside or outside programmable.

Threshold : programmable from 0 to 500 units.

Hysteresis : programmable from 0.1 % to 10.0 % of the input span or 1 LDS.

Deviation alarm

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1604-7-1-AB.p65 30 5/16/00, 10:50 AM