Extech Instruments 48VTR Instruction Manual page 8

dP: Decimal Point selection.
00
01
02
03
Ct: Control Output Cycle Time. Range: 0 to 100 seconds. This is the period of
time the controller waits between output percentage changes. The longer the
time set here, the less responsive the controller will be to process changes.
Set Ct for the longest period of time possible without causing process
oscillations; this will help to prolong the life of the relay.
NOTE: Set 'Ct' to '0' seconds for the 4-20mA analog output option. Parameter
'Ct' is not used when ON/OFF control is activated.
Hyst: Hysteresis for ON/OFF control output. Users can create a deadband region
from 0.0 to 25.5% of SPAN. The SPAN is the region that extends from the
user-programmable Low Limit (LoLt) value to the High limit (HiLt) value.
Hysteresis is used to eliminate control relay chatter by creating a deadband
that extends from the setpoint down or up (depending upon the relay's
function) where no relay action can occur.
EroP: Error Protection. The desired state to which the Control and Alarm relay
outputs default in the event of controller error.
Addr: Not used. Set to 0.
PVoF PV Offset. Permits the user to offset the PV indication from the actual PV. For
example, if the thermocouple used is producing readings 2
actual temperature across the range, the user can eliminate the 2
by programming a "-2" value at this parameter. Overall range of the setting is -
180 to +180. The default value is '0'.
tyPE: Sensor input selection. Select from the list below:
J type thermocouple
00
K type thermocouple
01
02 T type thermocouple
E type thermocouple
03
04 B type thermocouple
05 R type thermocouple
S type thermocouple
06
07 N type thermocouple
RTD Pt100 ohm (DIN)
08
RTD Pt100 ohm (JIS)
09
10 Linear mode (voltage or current input)
LoLt: Low limit (of Span or Range). Set the Low Limit lower than the lowest
expected SV and PV display. Note that the low limit is restricted to the limits
specified for the type of input selected.
HiLt: High limit (of Span or Range). Set High Limit higher than the highest expected
SV and PV display. Note that the high limit is restricted to the specification for
the type of input selected.
48VTR English 9/00
no decimal point
0.1 resolution
0.01 resolution (cannot use this setting for temperature inputs)
0.001 resolution (cannot use this setting for temperature inputs)
0 OFF
OFF
1
2 ON
3 ON
Ver. 2.7
OFF
ON
OFF
ON
Note: The controller can be
ordered in one of four input types;
Thermocouple, RTD, Voltage or
Current.
Conversion from one input type to
another requires a hardware
modification. Contact Extech for
information.
7
o
higher than the
o
difference