Chapter 6 – Additive Control
Firmware Version 3/4.31.37
6.5.7 METHOD 4 – ANALOG ADDITIVE
This configuration assumes that a flow measurement device is metering the amount of additive entering the
product stream. It is assumed that there is no piston/cylinder and that the additive output port (4 – 20mA) is
commanding a drive of a pump, which controls the delivery of additive. Instead of incrementing the additive
totalizer at each injection or upon receipt of a feedback signal, this feature updates the additive totalizers based
upon measured flow.
Because the physical limitations of a piston/cylinder injector are eliminated, the Throw Time parameter is
irrelevant. The Volume Per Injection parameter is still valid, however. The Volume Per Injection parameter sets a
target pace that the system will inject, if necessary, in order to eliminate a deficit. To control better the drive of the
pump a PID loop is implemented. All three parameters can be changed to get a stay drive of the pump during
loading.
The Solenoid Shut Pulses parameter applies only to the Pulser Input additive method. The quantity of pulse
overruns due to valve action can be determined by performing the Additive Calibration test or the Additive
Diagnostic Test Injection. The quantity of excess pulses delivered for each test injection can be observed. When
the number of overrun pulses is determined, enter the number into this parameter to further reduce the overrun.
(See the Additive Calibration topic later in this chapter for details.)
6.5.8 CONFIGURING A ANALOG ADDITIVE
This topic describes the minimum configuration needed to get an additive to operate using this method.
Configuration of the following parameters is mandatory. You can accomplish this using the MultiLoad II
Configuration Tool or the MultiLoad II keypad in Program mode. Select the preset and additive desired.
Set this value to the FCM # where the additive is connected.
Set this value to zero for the internal I/O board. This should be
always a flow fcm2, because the only fcm who has an analog
output.
Select the port that will serve as the Additive Injection Output.
Note: A corresponding additive input port will automatically be
assigned. See the Additive Port Assignment description above.
Set this value to ‘AnlgMtr’. MultiLoad will control the pump speed
to inject continues the additive into the main line. Feedback we
receive via the pulser of the additive.
Additive Volume Per Injection
Enter the injection volume in the appropriate units.
This parameter is not applicable.
Enter the additive meter's K-factor in pulses per gallon.
The remaining parameters that apply to this additive method are optional. They are used to set up alarming,
pump outputs and permissive inputs. Some of the remaining parameters affect how the additive is delivered at
different stages of the load cycle. All Additive configuration screens and parameter descriptions are found in the
‘General Additive Setup’ section that follows.
The “Parameters for Additive Methods” table lists the parameters that apply to this method.
6.5.9 METHOD 5 – COMMON METER WITH MULTIPLE ADDITIVES
Method 4 permits multiple additives to be delivered through a common injector.
The injector must use an additive meter that provides a pulsed output to a Flow Control Module. This method of
additive metering is an extension of the Pulse Input approach (Method 3). The principles described in Method 3
apply to this method, also.
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