Table of Contents
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the less responsive the controller will be to process changes. Set Ct for the
slowest rate possible without causing process oscillations; this will help to
prolong the life of the relay. Not used with analog outputs or ON/OFF control.
Set Ct to '1' second for the 24VDC Pulsed Voltage output option and '0' seconds
for the 4-20mA analog output option. Parameter 'Ct' is not used when ON/OFF
control is activated.
C Ct: Secondary Output 2 Cycle Time (same as Ct above except it is for the Secondary
Control Output)
Hyst: Primary Control Output 1 Hysteresis (used with ON/OFF control). Users can
create a deadband region from 0.0 to 25.5% of SPAN. Note: The SPAN is the
range 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. Select a setting from Table II below.
Set
OUT 2 ALM 2 ALM 1 OUT 1 Set OUT 2 ALM 2 ALM 1 OUT 1
0
OFF
OFF
1
OFF
OFF
2
OFF
OFF
3
OFF
OFF
4
OFF
ON
5
OFF
ON
6
OFF
ON
7
OFF
ON
Addr: Controller address used with the RS-485 communications option so that a PC can
recognize a specific 96VTR controller from among a group of 96VTRs or other
connected interface devices. Setting range is "0" to "31". Default = 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
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:
Set to '00' for J type thermocouple
Set to '01' for K type thermocouple
Set to '02' for T type thermocouple
Set to '03' for E type thermocouple
Set to '04' for B type thermocouple
Set to '05' for R type thermocouple
NOTE: To change a controller configured for a Thermocouple input to an RTD or
linear input, hardware modification is required. Please contact Extech for details.
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 setting is limited by the range of the
type of input used (refer to Section 2.2 for ranges).
Table II - Error Code Settings for Parameter 'EroP'
OFF
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
8
ON
OFF
9
ON
OFF
10
ON
OFF
11
ON
OFF
12
ON
ON
13
ON
ON
14
ON
ON
15
ON
ON
Set to '06' for S type thermocouple
Set to '07' for N type thermocouple
Set to '08' for RTD Pt100 ohm (DIN)
Set to '09' for RTD Pt100 ohm (JIS)
Set to '10' for Linear mode (analog)
8
OFF
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
o
higher than the
o
difference by
96VTR
Ver. 2.0 11/99
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