ProMinent Aegis-II, Руководство по сборке и эксплуатации, Страница: 82 / 102

Programming the Outputs
Page 82 of 102
10.12.3 Varying Cycles:
Varying Cycles is not recommended for Pulse relays
6
– 9.
Note: WHEN “CONTROL Type” is set To Blowdown
Controls tower bleed on the ratio of the Tower to
Make-up conductivity.
The user selects the cycles of concentration for
three ranges of make-up conductivity and maximum
tower sump conductivity.
The controller measures the make-up conductivity
and controls bleed @ one of the three cycles of
concentration. If the tower sump exceeds the
maximum conductivity, the tower conductivity is
used to control the bleed & to reduce the sump
conductivity.
Where Used:
If your make-up changes seasonally or periodically
and you have a 2nd conductivity sensor installed in
the tower make-up line you can control using
Varying Cycles.
Where Not Used:
1. If the holding time or turnover time of the tower
is ‘long’ then the bulk of the tower water has not
changed when the make-up conductivity
changes & you may scale if hardness limited.
‘Long’ is site specific and a function of temperature,
water chemistry and treatment program.
2. If the make-up conductivity does not track the
component that limits the maximum cycles. For
example, hardness may increase with
conductivity but silica may not & you may be
silica limited.
Varying Cycles Setup:
1- To Set and adjust the Varying Cycle press
MENU
2- Scroll to the I/O Setup selection and press
OK
3- Scroll to select the desired relay
(1:Blowdown) and press OK
4- Scroll to Special Control and press OK
5- Scroll to Varying Cycle and press F1
6- Use Up/Down and Left/Right Arrow keys to Edit
the max conductivity value then press F2 in this
example If the tower sump exceeds
Max
Conduct, 3000 uS
, the bleed opens to limit the
conductivity.
7- Use Up/Down and Left/Right Arrow keys to Edit
the High Cycles value then press F2 in this
example
High Cycles
=
2.5
so the tower sump
would be nominally 2500 uS ( 1000 x 2.5).
8- Use Up/Down and Left/Right Arrow keys to Edit
the High Range value then press F2 When the
make-up conductivity less than
High Range
, in
this example
1000 uS
, the bleed controls @
High Cycles
9- Use Up/Down and Left/Right Arrow keys to Edit
the Med Cycles value then press F2 in this
example
Med. Cycles
=
4.25
so the tower sump
would be nominally 2762.5 uS ( 650 x 4.25).
10- Use Up/Down and Left/Right Arrow keys to Edit
the Med Range value then press F2 When the