48VTR Datasheet, PDF (7/14 Pages) Extech Instruments Corporation. – 1/16 DIN Process Controller

Pb:
Proportional band value. Setting range from 0.0 to 100.0% of controller's
Span. Default = 10.0. Set Pb to 0.0% for ON/OFF control action. This value
is automatically calculated by activating the AUTO TUNE function. If desired,
the user can later adjust this parameter to better suit the application.
ti:
Integral (Reset) value. 0 to 3000 seconds setting range. Default = 240. This
value is automatically calculated by activating the AUTO TUNE function. If
desired, the user can later adjust this parameter to better suit the application.
td:
Derivative (Rate) Time. 0 to 3000 seconds setting range. Default = 40. This
value is automatically calculated by activating the AUTO TUNE function. If
desired, the user can later adjust this parameter to better suit the application.
8. THIRD PROGRAMMING LEVEL PARAMETERS
Press and hold the SCROLL and RETURN keys simultaneously for 5 seconds to enter
this level from the second programming level. To return to normal operation at any time,
press the RETURN key.
rEmo: Unused (must be set to ‘0’)
P-L: Parameter Lock. This security feature locks out selected programming levels
or single parameters prohibiting tampering and inadvertent programming
changes. Depending upon setting, only certain Level 1 parameters display.
A1Fu:
A1HY:
Act:
unit:
Setting
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Parameter Lock-out effect
All parameters adjustable (Level 1 parameters: A1SP only)
Same as ‘0’ (level 1 parameters: Ramp and A1SP)
Same as ‘0’ (level 1 parameters: oPoF and A1SP)
Same as ‘0’ (level 1 parameters: Ramp, oPoF, and A1SP)
Same as '0', but level 4 is locked out
Same as '1', but level 4 is locked out
Same as '2', but level 4 is locked out
Same as '3', but level 4 is locked out
Same as '0', but levels 3 and 4 are locked out
Same as '1', but levels 3 and 4 are locked out
Same as '2', but levels 3 and 4 are locked out
Same as '3', but levels 3 and 4 are locked out
Same as '0', but levels 2, 3, and 4 are locked out
Same as '1', but levels 2, 3, and 4 are locked out
Same as '2', but levels 2, 3, and 4 are locked out
Same as '3', but levels 2, 3, and 4 are locked out
Alarm Function. Select the desired Alarm or Timer function from the alarm
functions list in Appendix A.
Hysteresis for Alarm. The Setting range is 0.0 to 25.5% of the controller's
span settings. The controller's Span extends from the value programmed in
'LoLt' to the value programmed in the 'HiLt' parameter (Low and High Limits).
Hysteresis is used to eliminate relay "chatter" by creating a deadband that
extends from the alarm setpoint down or up (depending upon the alarm type)
where no relay action can occur. The larger the hysteresis value the less the
possibility of relay chatter.
Output control action. Set to "0" for cooling (direct) action or "1" for heating
(reverse) action.
Unit of measure selection. Program as follows:
0
degrees F
1
degrees C
2
Process inputs
48VTR English 9/00 Ver. 2.7
6