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Programming the Outputs
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
Page 82 of 102
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