96VTR Datasheet, PDF(8/15 Page) Extech Instruments Corporation.

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96VTR Datasheet, PDF (8/15 Pages) Extech Instruments Corporation. – 1/4 DIN Process Controller

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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.

Table II - Error Code Settings for Parameter âEroPâ

Set OUT 2 ALM 2 ALM 1 OUT 1 Set OUT 2 ALM 2 ALM 1 OUT 1

0 OFF OFF OFF OFF 8 ON OFF OFF OFF

1 OFF OFF OFF ON 9 ON OFF OFF ON

2 OFF OFF ON OFF 10 ON OFF ON OFF

3 OFF OFF ON ON 11 ON OFF ON ON

4 OFF ON OFF OFF 12 ON ON OFF OFF

5 OFF ON OFF ON 13 ON ON OFF ON

6 OFF ON ON OFF 14 ON ON ON OFF

7 OFF ON ON ON 15 ON ON ON 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 2o higher than the

actual temperature across the range, the user can eliminate the 2o difference 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:

Set to '00' for J type thermocouple Set to '06' for S type thermocouple

Set to '01' for K type thermocouple Set to '07' for N type thermocouple

Set to '02' for T type thermocouple Set to '08' for RTD Pt100 ohm (DIN)

Set to '03' for E type thermocouple Set to '09' for RTD Pt100 ohm (JIS)

Set to '04' for B type thermocouple Set to '10' for Linear mode (analog)

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).

96VTR Ver. 2.0 11/99

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