Super Systems AC20 User Manual

Page 53

The Burn off sequence is the following:
- The Burn off output (OUT 4)will be turned ON for a programma-

ble period (by "Gr. 8 - "t.bOF" [R.H01] parameter).

- At the end of this period, OUT 4 will be turned OFF and the

Purge output (OUT 5) will be turned ON for a programmable
period (by "Gr. 8 - "t.PrG" [R.H02] parameter).

- At the end of this period, OUT 5 will be turned OFF, the

procedure is completed and the normal control is resumed.

NOTES:

NOTES:
a)During the Burnoff and Purge procedures the control output,

the Adaptive algorithm and alarm status are frozen.

b)During the Burnoff and Purge procedures the input span 0 to

1500mV will be enabled, independently of the primary
controlled variable selected.

c)If a power down occurs, the current Burn off status and timings

will be lost (if automatic burn off was set, the timer will start
again from the value set by the "bF.tr" [R.H03] parameter).

Status

Purge
OUT5

Off

Burnoff
OUT4

Off

Burnoff
timer

Purge
timer

Time

Controlled
variable
(% CP)

Instrument in
AUTO mode

Automatic Burnoff
interval "bF.tr"
parameter

Acting by keys,
external contact or
serial link

Time

Automatic Burnoff
interval "bF.tr"
parameter starts
again

Instrument
functions kept
frozen

Burn off and purge

Burn off and purge
description

description