Extech Instruments 48VTR Instruction Manual page 14

Programming Level 1
A1SP (Alarm Setpoint): Set to 600
annunciator.
Tuning the Controller (Level 2 parameters)
The best plan of attack with tuning is running the Auto Tune utility. Auto Tune will
automatically program the controller to respond with little process oscillation around
setpoint and minimal overshoot on oven heat-up. Run the Auto Tune utility per section 11
in this manual. Running Auto Tune supersedes programming Level 2 parameters.
Programming Level 3
A1Fu (Alarm Function): Set to '2' which is an absolute process alarm, meaning that the
alarm is fixed. In this case the alarm will be fixed at 600
programmed above in Level 1.
A1HY (Alarm Hysteresis): Set to '0'. Hysteresis is similar to 'deadband'. A region
extending from the alarm setpoint up or down, depending upon the alarm type, where
no relay action can occur to eliminate relay chatter.
Act (Action): This is control output action. Set to '1' for heating.
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unit: Set to '1' for
dp (decimal point): Set to '0' for no decimal point
Ct (Cycle time): To start off with, set to approx. 6 seconds. This can be re-adjusted later
after the process is observed. Cycle time is the rate at which the controller will make
adjustments to the heater. Set for the longest time possible (to save relay life) without
causing process oscillations.
tYPe: Set to '1' for a K Type Thermocouple
LoLt and HiLt (Low Limit / High Limit): Set these to 0
the Range/Span limits setting).
Calibration (Level 4 parameters)
Calibration is rarely required. If calibration must be performed refer to Section 10 for
details or contact Extech.'
48VTR English 9/00
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F. Temperature at which the alarm will switch on the
F
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13
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F value is
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