Zener 8000 Application Manual page 15

Application SW08020: Pump PID 2 [Advanced Pump PID Control]
Idle Mode based on Flow Switch Input
This application configures a digital input D3(35) for a flow switch input. The flow switch provides a more
simple setup process ('load % threshold' is not used). When the flow switch provides an 'open contact' (no
flow) into D3 (terminal 35) for the 'Idle delay' period, the ZENER 8000 will enter idle mode. It will operate in
conjunction with the above 'load %' method if configured.
NOTE: If there is no switch available or installed a link must be fitted between terminal 1 & 35.
Idle Mode Adjustments
The following steps will help find the settings for Idle Mode.
STEP 1. Select the operator display that displays the following
[Press ENTER to step through the displays]
Note: You may also need to set the minimum speed to 30Hz or less to do the following test
STEP 2. Select one of the following methods to determine the initial idle settings.
Method 1: Operate the ZENER 8000 in PID Mode and close the discharge valve. The speed should decrease and
the pressure should remain at the set point. Take the Load % and the speed reading. Stop the Pump
or open the discharge valve.
Method 2: Operate the ZENER 8000 in local mode. Close the discharge valve. Press the FWD/▲ button to start
and increase the speed until the set pressure is reached. Take the Load % and the speed reading. Stop
the pump.
Note this value: ________Hz
Note this value: ________%
MIN Speed (Hz)
Idle Threshold %
Time before Idle
Resume Pumping @
Page 14 Document: IM00127 RevB
0 (default)
20% (default)
5 sec (defaut)
25% below SV
18/04/18
Speed in Hz
% Load
30.0Hz 500kPa
36% 800 rpm
Adjust to value equal to or higher than the minimum
operating speed for the pump.
Speed (Hz) value recorded in step 2 for "idle" to operate. This
must be set to a level which will allow a 'no flow' condition (eg.
Flow switch operation').
Set at approximately 2-3% higher than the above recorded
'load%' value. Eg. Load % = 32% at dead head, set to 35%
This is not required if using a flow switch. To turn Idle
operation OFF adjust this to 0%.
Increase / decrease if required
This must be longer than the time for the 'idle trigger' to
indicate a flow. ie. flow switch or 'Load %'
Adjust if required.
Reduce the value if required to 'wake' at a higher pressure.
Increase the value if required to 'wake' at a lower pressure.
Actual Pressure PV
28.0Hz 400.0kPa
36% 800 rpm
Adjust the 'Idle' Settings.
Refer to page 15
This must be less than the