Spirax Sarco PLC User Manual

253.635.5275.253
Level Setup
Push
^
key to enter the screen shown in screen 20
Denition of the required value (set point).
Depending on the actual level, there are different control typologies:
1) ON-OFF level with ON-OFF Control valve
No level to be set.
2) ON-OFF level with ON-OFF Control pump
No level to be set.
3) Continuous level (4-20 mA) with ON-OFF Control valve
Set the value of operation level. Within protect parameters, it will be requested the setting of the diffe-
rential value relevant to the set value, for START-STOP control of the valve (e.g.: for a level set to 250
mm and a 20mm differential, the valve will be opened at a level lower than 230 mm, to shut at the set
value achievement of 250 mm).
4) Continuous level (4-20 mA) with ON-OFF Control pump
Act as step 3).
5) Continuous level (4-20 mA) with Modulating Control valve
Set the operation level value (mm). The valve will be controlled with 0-10 V modulating signal, in fun-
ction of the set value and of the proportional band set within protected parameters.
To enter the required set value, press
^
or
^
keys until the required set value will be visualized on the screen;
otherwise press the OK button. The value of set point unit now ashes.
Press
^
and
^
keys to enter the required value.
Press
^
to shift the cursor on the digit with value in tenth.
Then press
^
and
^
keys to enter the required value.
Again press
^
to shift the cursor on the digit with the value in hundreds.
Press
^
and
^
keys to enter the required value.
Press nally the OK key and afterwards the
^
key to shift to the next setting.
Bottom blowdown
When the system is provided with the bottom blowdown function, it is possible to set the duration of shutting
time (-- hours) and opening time (-- seconds). The length of opening is the time (expressed in seconds)
during witch the blowdown occurs; the length of shutting is the interval of the hours elapsing between two
bottom blowdown.
Setting of the interval time between bottom blowdown operations
In “automatic” mode, press the v key to enter the screen shown on screen 21. Press ^ or ^ key to set the
interval duration (hours) until the screen displays the required value. The interval is selectable from 00 to
99 with one-hour increments.
Press
^
and
^
keys to enter the required value.
Press
^
to shift the cursor on the digit with value in tenth.
Then press
^
and
^
keys to enter the required value.
Again press
^
to shift the cursor on the digit with the value in hundreds.
Press
^
and
^
keys to enter the required value.
Press nally the OK key and afterwards the
^
key to shift to the next setting.

Spirax Sarco PLC Specifications

General

Brand	Spirax Sarco
Model	PLC
Category	Controller
Language	English