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. |
| 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. |
| 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. |
| 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. |
| Lcb2
- Used in gain scheduling. |
| See G.SP
and Lcb. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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.) |
| 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). |
| rEL.2
- Used in gain scheduling. |
| See G.SP
and rEL.C. |
| 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. |
| rESr
- Reset/Run |
| Digital input
is open for reset, closed for run. |
| rES.2
- Used in gain scheduling. |
| See G.SP
and rES. |
| rm.SP
- Remote setpoint |
| Analog signal
brought in from another device. |
| 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. |
| 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. |
| SSEL
- Select SP1 to SP16, depending on configuration |
| Permits the
user to determine which setpoint will be displayed. |
| 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. |
| 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. |
| 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. |
| 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. |
| td
- Derivative time in secs (setpoint 1) |
| Gives a fast
response to large change in the process value which aids in improving process
stability. |
| tdz
- Used in gain scheduling. |
| See G.SP
and td. |
| 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. |
| ti2
- Used in gain scheduling. |
| See G.SP
and tl. |
| Val.L
- Display reading low |
| Displays
reading which corresponds to minimum linear input value - the low range
of the sensing device. |
| Val.H
- Display reading high |
| Displays
which corresponds to maximum linear input value - the high range of the
sensing device. |
| VAL.1
- VAL.3 - Display values corresponding to the 8 input values ( in 1 - in
8) |
| These 8 input
characterize a custom, 8 point curve. |
| w.SP
- Working setpoint |
| 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. |
|
