20
Error Messages
Overrange or underrange and sensor break indications
This device is capable of detecting process variable faults
(OVERRANGE, UNDERRANGE or SENSOR BREAK). An
OVERRANGE condition will appear as:
An UNDERRANGE condition will appear as:
A sensor break will be signalled as:
- For TC input: OVERRANGE or UNDERRANGE
(selected by a solder jumper)
- For RTD input: OVERRANGE
Sensor lead short circuit detection:
- On RTD input, a special test is provided to signal
OVERRANGE when input resistance is less than 15
Ohms (short circuit sensor detection).
Output action on Over/Underrange:
- The instrument is set for one output and an
OVERRANGE is detected, then OUT 1 turns OFF (if
reverse acting or ON ( if direct acting).
- Instrument is set for heating/cooling and an
OVERRANGE is detected, then OUT 1 turns OFF and
OUT 2 turns ON.
- The instrument is set for one output only and an
UNDERRANGE is detected, then OUT 1 turns ON (if
reverse acting) or OFF (if direct acting).
C2 Output 2 cycle time. Available only if P4 =
HC and Pb is different from 0 only. Range
from 1 to 200 s.
rC Relative cooling gain. this parameter is
skipped if Pb = 0 (on-off action) or P4 = H.
Range from 0.20 to 1.00. When SMART AT
function is enabled, the rC parameter is
limited in accordance to the selected coolant:
•0.85 to 1.00 when P6 = Air
•0.80 to 0.90 when P6 = OIL
•0.30 TO 0.60 when P6 = H2O
OLP Deadband/overlap between H/C outputs.
OLP is skipped if Pb = 0 (on-off action) or P4
= H. A negative OLP value shows a
deadband while a positive value shows an
overlap. Range from -20 to 50.
rL Setpoint low limit. Range from minimum
range value (P2) to rH. When P2 has been
modified, rL will be realigned to it.
rH Setpoint high limit. Range from rL to full scale
value (P3). When P3 has been modified, rH
will be realigned to it.
rP Ramp applied to the setpoint changes.
Range from 1 to 100 digit/min. Above this
value the display shows “Inf” and the transfer
will be a step transfer.
OLH Control output high limit. Skipped if Pb = 0
(on-off action) Range:
•0 to 100% when P4 = H
•-100 to 100% when P4 = HC.
tOL Time duration of the output power limiter. tOL
is skipped if Pb = 0 (on-off action). Range
from 1 to 100 min. Above this value the
display shows “Inf” and the limit will be ever
enabled. The tOL can be modified but the
new value will become operative only at the
next instrument start up.
Hbd Setpoint of heater breakdown alwrm. Hbd
is available only when P16 is different from
OFF. Range within the current transformer
range (see P17).
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