SERIES 2000 GLOSSARY
Parameters Used in the Scroll Lists |
| NOTE: Several parameters are read only and some are for
diagnostic purposes only. Most of these types of parameters have been omitted
from this glossary. |
| |
Adc - Automatic
Droop Compensation (PD only control) |
| Permits manual setting of integral
(reset) value. This has the effect of moving the proportional band of resetting
the measured value to equal the setpoint. |
| bcd - BCD input
function |
| Permits installation of switch with
user can toggle among three different setpoints or programs. |
| Blocking Alarm
|
| A blocking alarm does not function
until setpoint is reached. Thereafter, if an alarm condition develops, the
alarm will change state. |
| cAL - Calibration
type |
| NOTE: There is a factory
recalibration - under cAL, select PV, then choose YES or factory. |
| CJC or CJC 30:1 -
Cold Junction Compensation |
| Compensates for large variations in
ambient temperature which otherwise would cause significant changes in
controller input accuracy and, therefore, controller output signals. For
example, in a 2404 instrument, a 30 degree change in ambient temperature will
cause only a maximum error of one degree. Eurotherm's INSTANT ACCURACY™
patented technology will sense ambient changes and correct for them.
Instruments without INSTANT ACCURACY will correct for CJC over 30 - 60 minutes.
|
| |
CYC.C - Cool cycle
time (0.2s to 999.9s) |
| |
The overall time that cooling is
permitted to cycle. For example, at a 1 second cycle time, if the instrument
requests a 40% output, that equals .4 second cooling on and .6 second cooling
off. |
| |
CYC.H - Heat cycle
time (0.2s to 999.9s) |
| |
The overall time that heating is
permitted to cycle. For example, at a 1 second cycle time, if the instrument
requests a 40% output, that equals .4 second heating on and .6 second heating
off. Fast cycling permits the best control and the longest heater life. Select
< 1 second when used with solid state relays, 10-20 seconds when used with
mercury contactors, and >60 seconds when used with mechanical
contactors. |
| |
dIAG - Diagnostic
alarm 'no'/'YES' |
| |
If "YES", alarm outputs
will be listed. |
| |
drA - Adaptive tune
enable |
| |
Makes it possible for the
controller to employ the adaptive tune feature. |
| |
drA.t - Adaptive
tune trigger level in display units. Range=1 to 9999 |
| |
Once setpoint has been reached and
control stabilized, adaptive tune trigger level is the distance away from
setpoint at which the controller will initiate a self-tune. Adaptive tune is
most beneficial in processes where conditions that affect change with some
frequency. |
| |
FASt - Fast run
through program (no/YES) |
| |
Permits user to quickly run through
program and check if outputs turn off or on as programmed. |
| |
FOP - Forced manual
output power |
| |
Provides choice or bumpless
auto/manual; that is, when manual mode is selected, a predetermined output
level will be activated. |
| |
FF.Pb - SP, or PV,
feedforward proportional band |
| |
Feed forward is used for ratio
control between two setpoints such as in a furnace temperature vs load
temperature application (not to be confused with true cascade control). |
| |
FF.tr - Feedforward
trim % |
| |
An offset that is added to or
subtracted from the feedforward value. |
| |
Func (LA, LB, or
LC) |
| |
Function of Digital Inputs used for
logic functions. A switch (dry contact closure switch) can be installed which
enables user to switch between the standard digital inputs functions. For
example: select setpoint 2, activate self-tune, go to manual output, freeze
integral calculations, etc. |
| |
Fwd.t - Feed
forward type |
| |
Forward setpoint based on output
power. |
| |
Gsch - Gain
schedule enable |
| |
The PID values for one setpoint
might not be appropriate for a setpoint which is significantly higher or lower
than another. If enabled, this feature permits a second set of PID values to be
used with a second setpoint which might be employed, for instance, at some
point during a running program. (See SP.2 and PID.2) in Configuration section
and SP2.L, SP2.H and SP 2 in operation section of manual.) |
| |
G.SP - PV at which
transfer from 'PID.1' to 'PID.2' takes place |
| |
Used in conjunction with gain
scheduling. When the characteristics of the process change and a new setpoint
(setpoint 2) in entered for which former PID values are not appropriate, G.5P
causes the second set of PID values to be used when setpoint is
approached. |
| |
Hb - Holdback type
(OFF, LO, HI or bAnd) |
| |
Present only in setpoint
programming controllers. "Holds" the ramp/dwell program and waits for
the furnace to "catch up". - Functions with Hb V (holdback value).
Restricts holdback, if not turned OFF, to heating segments (Lo) or cooling
segments (HI) of program, or can be set up to be employed during both heating
and cooling segments (bAnd). |
| |
Hb.tY - Holdback
Type for setpoint rate limit (OFF, Lo Hi, or bAnd) |
| |
Same as Hb, except that this
holdback is activated, if needed, during a ramp to setpoint which takes place
other than during the running of a program. |
| |
Hb V - Holdback
value (display units) |
| |
Present only in setpoint
programming controllers - Places a running program into a hold position. This
occurs when the process variable deviates from setpoint by the amount
established as the holdback value. |
| |
Hcb - High Cutback
(setpoint 1) |
| |
During an auto-tune sequence, this
parameter is automatically set by the controller. Hcb permits the user to set
the value of this parameter that is activated during the tuning of a cooling
control loop to prevent undershoot. If the control mode is auto, Hcb defaults
to three times the proportional band. |
| |
Hcb2 - Used in gain
scheduling. |
| |
See G.SP and Hcb. |
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HY1 (2, 3, and 4) -
Alarm 1 (2, 3, and 4) Hysteresis (in display units) |
| |
Used to prevent alrm relay
"chatter". The distance away from an alarm point that a process
variable must travel before the alarm condition resets. For example: alarm=300
and HY=2. The alarm activates at 300 and will not clear until 298. |
| |
In 1 - In 8 - Input
values for 8-point linearization |
| |
Enables user to customize input
scaling across an 8-point curve. Intended for use with custom sensors. |
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Latching Alarm
|
| |
A latching alarm remains in alarm
condition until it is reset. A non-latching alarm resets itself as soon as the
alarm ceases to exist. The alarm condition continues throughout the hysteresis
value. |
| |
Lbt - Loop Break
Time in seconds |
| |
When an output ceases to function
correctly, loop break time determines the period of time which elapses before
an alarm output changes state. For example: set Lbt at 300 seconds (5 minutes).
If the temperature is below setpoint and the Eurotherm increases the output but
nothing happens for 300 seconds, then the Lbt alarm will activate. Typical Lbt
conditions: heat contactor is broken, fuse is blown or thermocouple was not put
back into the machine. |
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Lcb - Cutback Low
(setpoint 1) |
| |
During an auto tune sequence, this
parameter is automatically set by the controller. Lcb permits the user to set
value of this parameter which is activated during the tuning of a heating
control loop to prevent overshoot. If the control mode is auto, Lcb defaults to
three times the proportional band. |
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Lcb2 - Used in gain
scheduling. |
| |
See G.SP and Lcb. |
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mV.1 - IP1 measured
value (at terminals) |
| |
Displays the analog value of input
1. Eliminates the necessity of using a meter to verify the input. Also provides
a means of determining if the sensing devise is wired backwards (will display
negative value). |
| |
mV.2 - IP2 analog
value (at terminals) |
| |
Only if DC input in Module 3
position. - Displays the analog value of input 2. See mV.1 above. |
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nSP - Number of
setpoints - 2, or (in 2400s only) 4 |
| |
This parameter permits selecting
number of setpoints stored in memory in the non-programmer instruments. The
programmer instruments automatically have 16 segments of ramp/dwell/ramp/…
setpoint profiling. |
| |
ont.C - Cool output
minimum on-line (secs). Auto (0.05s), or 1-999.9s |
| |
The minimum time cooling output is
on when the controller is set to auto control mode. Some compressor or valves
require a minimum on-time. |
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ont.H - Heat output
minimum on-time (secs). Auto )0.05s), or 1-999.9s |
| |
The minimum time heating output is
on when the controller is set auto control mode. Some Eurotherm solid state
relays require a minimum on-time (such as .2 seconds) in order to read amperage
or other partial load failure diagnostics. |
| |
OP.Lo - Low power
limit (%) |
| |
Set to (-100) for cooling; to 0 for
heating for most applications. Permits user to limit power if necessary. |
| |
OP.Hi - High power
limit (%) |
| |
Set to 0 for cooling; to 100 for
heating for most applications. Permits user to limit output power if
necessary. |
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out.n - Event
output states (OFF/on) |
| |
Establishes whether output is low
or high during a program event. |
| |
Pb - Proportional
Band in display units (setpoint 1) |
| |
The range of process values over
which linear gain action occurs before the output saturates at maximum or
minimum. Value should be as low as possible without causing oscillation. |
| |
Pb2 - Used in gain
scheduling. |
| |
See G.SP and Pb. |
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Pd.tr - Burnpless
Manual/Auto transfer when using PD control |
| |
When instrument control mode is
switched from auto to manual, output may change dramatically, shocking the
system (non-bumpless transfer). Selecting Pd.tr will cause output to change
gradually so that the system is not shocked. |
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PwrF - Power
Feedback |
| |
Enables controller to monitor and
correct for fluctuations across the supply voltage. For example: in a
"brownout", the instrument instantly increasing the output so the
heaters continue to deliver the same BTUs even though the voltage has dropped.
(Do not confuse this mnenomic with Pwr.F, power fail, in the programmer
configuration.) |
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Pwr.F - Power fail
recovery in the programmer list |
| |
Determines from what the instrument
is to do if power is interrupted during the running of a program. (Three
options: continue from last setpoint (SP; ramp, at last ramp rate, from PV to
SP; or reset the program.) |
| |
rEL.C - Relative
Cool Gain (setpoint 1) |
| |
Compensates for the different
quantities of energy needed to heat, as opposed to that needed to cool, a
process. For example: water cooling applications might be a rEL.C of 4 (cooling
is 4 times faster than the heat-up process). |
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rEL.2 - Used in
gain scheduling. |
| |
See G.SP and rEL.C. |
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rES - Manual Reset
(%) (setpoint 1) |
| |
Provides an opportunity for the
user perform the integral action rather than letting the controller
automatically calculate the value. |
| |
rrES - Run/Reset
|
| |
Digital input is open for run,
closed for reset. |
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rESr - Reset/Run
|
| |
Digital input is open for reset,
closed for run. |
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rES.2 - Used in
gain scheduling. |
| |
See G.SP and rES. |
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rm.SP - Remote
setpoint |
| |
Analog signal brought in from
another device. |
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rmt.t - Remote
setpoint trim |
| |
An offset - added to or subtracted
from analog signal brought in from another device. |
| |
Sb.OP - Sensor
Break Output Power (%) |
| |
Default output power in the event a
sensor-break condition arises. |
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Sbr.t - Sensor
break output |
| |
Enables user to establish whether
the output will freeze at the last output in existence at the time of a sensor
break (open sensing device or other problem at input of instrument), or go to a
pre-determined value. |
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SSEL - Select SP1
to SP16, depending on configuration |
| |
Permits the user to determine which
setpoint will be displayed. |
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SSr1 |
| |
If the Series 2000 has a LOGIC
output board installed and if the heat contactor is a TE10S/PDS1 smart
contactor, then selecting SSr1 permits the LOGIC board to activate the
contactor AND monitor for alarms from the contactor. |
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SSr2 |
| |
If the Series 2000 has a LOGIC
output board installed and if the heat contactor is a TE10S/PDS2 smart
contactor, then selecting SSr2 permits the LOGIC board to activate the
contactor AND monitor for alarms from the contactor AND monitor the amperage
flowing through the TE10S contactor. |
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Sync - Segment
synchronization (no/YES) |
| |
If YES, causes program of two or
more instruments to run synchronously. For example: instrument 1 is a
temperature programmer and instrument 2 is a carbon potential programmer. |
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SYNC - Synchronizes
program of two or more programmer instruments |
| |
If enabled,
programs of two or more instruments can be linked (through setting Sync to YES
in parameter list) through PDSIO to one clock so that the programs run
simultaneously. |
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td - Derivative
time in secs (setpoint 1) |
| |
Gives a fast response to large
change in the process value which aids in improving process stability. |
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tdz - Used in gain
scheduling. |
| |
See G.SP and td. |
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ti - integral time
in secs (setpoint 1) |
| |
Helps to achieve zero steady-state
control error by resetting the setpoint at intervals determined by integral
time. |
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ti2 - Used in gain
scheduling. |
| |
See G.SP and tl. |
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Val.L - Display
reading low |
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Displays reading which corresponds
to minimum linear input value - the low range of the sensing device. |
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Val.H - Display
reading high |
| |
Displays which corresponds to
maximum linear input value - the high range of the sensing device. |
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VAL.1 - VAL.3 -
Display values corresponding to the 8 input values ( in 1 - in 8) |
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These 8 input characterize a
custom, 8 point curve. |
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w.SP - Working
setpoint |
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the setpoint during calculations.
For example: the setpoint in a ramping controller may be 400 but the w.SP will
be the calculated number which will be 200, 201, 202, etc. |
| |
w.OP - Working
output |
| |
output level which is calculated by
the control algorithm based upon the currently selected setpoint. |
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