model 2704 controller installation and operation handbook - Soliton
model 2704 controller installation and operation handbook - Soliton
model 2704 controller installation and operation handbook - Soliton
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<strong>2704</strong> Controller Programmer Operation<br />
6.4. PROGRAMMER TYPES<br />
The programmer can be configured as Time to Target or Ramp Rate. A time to target<br />
programmer requires fewer settings <strong>and</strong> is simple to use since all segments are the same. A<br />
time to target programmer can, in general contain more segments than a ramp rate.<br />
6.4.1. Time To Target Programmer<br />
Each segment consists of a single duration parameter <strong>and</strong> a set of target values for the<br />
profiled variables.<br />
1. The duration specifies the time that the segment takes to change the profiled variables<br />
from their current values to the new targets.<br />
2. A dwell type segment is set up by leaving the target setpoint at the previous value.<br />
3. A Step type segment is set up by setting the segment time to zero.<br />
6.4.2. Ramp Rate Programmer<br />
Each segment can be specified by the operator as Ramp Rate, Dwell or Step.<br />
1. Each profiled setpoint must complete its segment before the programmer will move to the<br />
next segment. If one ramp reaches its target setpoint ahead of the other variables, it will<br />
dwell at that value until the other variables have completed. The program will then move<br />
to the next segment.<br />
2. The duration parameter for a segment is read only. In this case the dwell period can be<br />
changed when the program is in Hold..<br />
3. The duration is determined by the longest profile setting.<br />
6.4.3. Segment Types<br />
A segment type can be defined as Profile, Go Back or End.<br />
6.4.3.1. Profile<br />
A profile segment may be set as:-<br />
Ramp<br />
Dwell<br />
Step<br />
The setpoint ramps linearly, from its current value to a new<br />
value, either at a set rate (called ramp-rate programming), or in a<br />
set time (called time-to-target programming). You must specify<br />
the ramp rate or the ramp time, <strong>and</strong> the target setpoint, when<br />
creating or modifying a program.<br />
The setpoint remains constant for a specified period at the<br />
specified target. When creating programs the target is inherited<br />
from the previous segment. When editing an existing program it<br />
is necessary to re-enter the target value. This allows the dwell<br />
target to be matched to a go-back segment.<br />
The setpoint steps instantaneously from its current value to a<br />
new value at the beginning of a segment.<br />
Installation <strong>and</strong> Operation H<strong>and</strong>book. Part No HA026502 Issue 1.0 Apr-00 6-9
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