Evoqua WALLACE & TIERNAN MFC, Instruction Manual

Page: 108 / 268

108
WT.050.580.000.DE.IM.0714
Functions
MFC
4.
Loop rise time too high (Display: "Ts = > 8h")
The time is determined by a measurement, which the control loop
requires at a 100 % dosing rate of the dosing system or the dosing
pump, to increase the actual value to 50 % of the measuring range.
This measurement is indicated by the message "9: Ts!" and may
take up to 4 hours.
If any of the error conditions described above occur, adaption is
interrupted. The measuring amplifier indicates an error message.
The "old" parameters Xp and Tn are not changed.
Determination of the control
parameters with known Tu and
Ts times
If the loop times Tu and Ts are already known or if these cannot
be determined automatically due to specific system conditions, the
loop times can be entered into the "Tu" and "Ts" menus. When Tu
or Ts are saved, the control parameters Xp and Tn are also
calculated and entered into the menus.
4.10 Interfaces
Various interfaces are available to externally link the MFC.
RS232 The RS232 interface serves to connect:
• A laptop or PC for a Firmware update
(Download the latest firmware version with an update program
and update instruction from the homepage (www.evoqua.com
Matching RS232 connecting cable: Ref. W3T164565).
• A printer
Specification of the RS232 interface for printer operation:
• Data transfer 9600 baud
• Parity even
• Word length 8 bit
A log is printed for eachday (see “Log printout" on page 109).
Daily log Each daily log consists of:
• Log header
• Line diagrams
• Release of daily min. and max. values
Log header The supplied measurements and the corresponding parameters
are printed in the log header. The date of the last calibration is also
documented.