Toptech Systems MultiLoad II User Manual

Chapter 5 – Product Flow Control
176
Firmware Version 3/4.31.37
5.2.8 ANALOG VALVES
Analog valves are control valves that operate from a 4-20mA signal that indicates the proportional opening of the
valve.
An analog signal of less than or equal to 4mA will drive the valve completely closed (0%).
An analog signal of greater than or equal to 20mA will drive the valve completely open (100%).
An analog signal between 4mA and 20mA will drive the valve to a percent open between 0% and 100%.
An analog valve by itself does not target a flow rate, so the valve control signal will be adjusted by MultiLoad to
target a flow rate profile.
With FCM or I/O Board versions 037 and later, MultiLoad can handle analog valves through proper configuration
as follows:
Navigate to: Program Mode->Configuration->Equipment Setup and configure the following parameters:
Parameter
Setting
Screen Location
Flow Scan Time
0.200 Seconds
Meter Setup
Analog Valve Control
ENABLED
Meter Setup
4-20mA Increase Step
0.080 mA
Meter Setup
4-20mA Decrease Step
0.800 mA
Meter Setup
To change the speed of positive flow changes, modify the 4-20mA Increase Step.
To change the speed of negative flow changes, modify the 4-20mA Decrease Step.
5.3 SEQUENTIAL BLENDING (EXCLUDING SMP)
P
P
Premium
Regular
BV
T1
CV
M1
BV
Comp #1
Comp #2
Figure 5.3 Sequential Blending Application
The Sequential Blending feature is used when loading two to eight (2 – 8) components together in a compartment
to make a single product. Typically the components will be delivered one at a time through the same load arm,
using one flow meter and one digital control valve.
Block valves, which serve as component selection valves, must be used to ensure loading of the proper
component in the proper sequence. These valves can be motor operated (MOV) or they can be manually
operated. In case, a block valve status or feedback signal can be employed to verify that the valves are in the
proper position at all times during the loading sequence.
The flow profile control sequence used in Sequential Blending is very similar to the sequence used for single
product loading. The sequence is repeated for each component that is used in the product recipe. The first
component of the blend will cycle through the following phases:
- Low Flow Start
- High Flow
- 1st Stage Trip

Toptech Systems MultiLoad II Specifications

General

Brand	Toptech Systems
Model	MultiLoad II
Category	Control Unit
Language	English