Ariens Path-Pro 136E User Manual download pdf (Page 35)

30°F,

or 11° to

17°C.

Observe

the system’s approach to SP. If the load

temperature overshoots SP, increase RT to 2.00 minutes.

Then raise SP by 20 to

30°F,

or 11 to

17°C

and watch the approach to

the new set point.

If RT is advanced too far, approach to the set point will

be very sluggish. Repeat as necessary until the system rises to the new

set point without overshooting or approaching the set point too slowly.

Calibration Offset Adjustment: You may want your system to control

to a temperature other than the value coming from the input sensor.

If so,

measure the difference (as much as

±90°F

±50°C)

between that tem-

perature,

perhaps at another point in the system, and

the

process value

showing in the alphanumeric display. Then enter the amount of CAL offset

you want. Calibration offset adds or subtracts degrees from the value of

the input signal.

The LOPWR and HIPWR Parameters

The LOPWR and HIPWR parameters allow you to limit the duty cycle of the

beat output to minimum and maximum values. The LOPWR parameter is used

to generate a minimum duty cycle regardless of the duty cycle

calculated

the

PID

circuit.

LOPWR Example:

LOPWR

20%

The

PID

circuit calls for a duty cycle of 10%. The LOPWR parameter overrides

the

PID

circuit and outputs a duty cycle of 20%.

For the HIPWR parameter, a maximum duty cycle is generated regardless

the duty cycle calculated by the

PID

circuit.

HIPWR Example:

HIPWR

80%

The

PID

circuit calls for a duty cycle of 100%. The HIPWR parameter over-

rides the

PID

circuit and outputs a duty cycle of 80%. These two parameters

help insure that an “idle” duty cycle is always applied, or that the heaters

cannot apply full power to the thermal system.

Where To Go From Here

Once you have tuned your Series 920, continue to Chapter 6 to learn how to

program your Series 920 for your system.

WATLOW

Series 920 User’s Manual

How To Tune The Series 920, Chapter

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Ariens Path-Pro 136E User Manual Page 35

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