Extech Instruments 48VTR Instruction Manual page 6

Table I - Programming Level Parameters (default values) at a glance
1st Prog. Level
RAmp (0.0)
oPoF (0.0)
A1SP or timE
Note: Symbols shown are similar to the
actual LED meter displays, which show
parameters in mixed case.
Some parameters may not appear
depending upon the setting in P-L
(Parameter Lock) in 3rd programming
level
* Default value is dependent on the type
of input or output installed in the device.
6. FIRST PROGRAMMING LEVEL PARAMETERS
Press the SCROLL key to enter this level. Then use the SCROLL key to move through
the parameter list. Use the ARROW keys to change the setting. To return to normal
operation at any time, press the RETURN key once.
Note: The configuration of the controller will dictate which parameters will appear. For
example, the 'ramp' parameter will not appear if Parameter Lock is set to a value
of '2' or '0'. Also, A1SP will not appear in the parameter list if parameter A1FU
(alarm function) is set to a value of 8,9,10, or 11.
rAmp: Programmable rate of rise limit for PV. Permits the user to restrict the rate at
which the measured variable (PV) changes. Setting range: 0.0 to 100.0 units
per minute. Default = 0. The controller will monitor the changing PV and
override the controller output if necessary to limit the PV's rate of change.
oPoF: Output Offset. "Manual reset" function. The user can program a value (0.0 to
100.0%) which will then be added to the controller output percentage. For
example, if the oPoF parameter is set to 10.0%, the controller's output
percentage will always be 10% higher.
A1SP: Alarm Setpoint value. (Set the desired Alarm type in the A1Fu parameter,
refer to Appendix A for Alarm functions). Allowable setting range is limited by
parameter 'LoLt' and 'HiLt' (Low and High Limit) settings and the input type
selected. To lock out A1SP press the SCROLL and DOWN keys together for 4
seconds. Use same key-press to unlock A1SP.
timE: Programmable duration for the Event/Soak Alarm Output Timers. The range is
0 to 9999 minutes. Refer to Section 13 and Appendix A for details on
Soak/Event Timer functions.
7. SECOND PROGRAMMING LEVEL PARAMETERS
Press and hold the SCROLL and RETURN keys simultaneously to enter this level from
the previous programming level. To return to normal operation at any time, press the
RETURN key.
NOTE: This is the Manual Tuning programming level. Rather than attempting a manual
tuning it is strongly recommended that AUTO TUNING be used to automatically set
these parameters. If PID Tuning is unfamiliar to you, manual tuning can cause
severe process disturbances. Try Auto Tuning first and then use Manual tuning
afterward to fine tune the parameters if desired. For the instructions on how to initiate
an Auto Tune session, refer to Sec. 11
48VTR English 9/00
2nd Prog. Level
Pb (0)
Ti (240)
Td (40)
Ver. 2.7 5
3rd Prog. Level 4th Prog. Level
REmo (0)
P-L (4)
A1FU (2)
A1HY (0.1)
Act (1)
Unit (*)
Dp (*)
Ct (15)
HYST (0.1)
EroP (2)
Addr (0)
PvoF (0.0)
TYPe (*)
LoLt (0.0)
HiLt (500.0)
LoCA (0.0)
HiCA 1000
TunE (1)