Athena 4000 Series Manual de operação - Página 10

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How To Set

The Auxilliary

Deviation Type: B, C or D

Output

The Deviation auxiliary output is triggered when the temperature deviates from the main setpoint by a preset

amount. Units can be ordered with high, low or common high/low trip points.

(Optional)

Full Scale Type: E

The full scale auxiliary output is triggered when temperature goes above its setting. The setting can be

placed anywhere within the span of the unit.

Setting

To set either type or auxiliary output press and hold the "read" switch to the left. The display will indicate the

present setting. Adjust set II to the desired trip point in either actual or deviation degress, whichever applies.

The output on terminals 5, 6, and 7 will be energized when the auxiliary setting is exceeded.

Optional 3 Mode

Installation

(PID)

The Series 4000 is available with optional plug-in PID. To install this option in the field, simply plug the

3-mode card into the connector located next to the output module socket and then cut jumpers (2) labeled

M (see bottom board drawing for location, Figure 5).

NOTE: : Each process

will tolerate differing

How to Set 3 Mode (PID) Action

warm-up curves.

3-Mode (PID) action automatically corrects for errors in proportionally controlled processes.

Often, a fast warm-

up is more important

than the elimination

of overshoot. If it is

important to eliminate

overshoot, a slower

setting should be used,

but it will also add to

the time it takes the

process to reach the

setpoint.

In general, it is

best to maintain the

tightest parameters

possible (narrow

proportional band,

faster reset, faster rate)

that still deliver optimal

process response.

If temperature

settles above or

below setpoint, use

manual reset for trim

adjustment.

Maintenance

Some preventive maintenance steps on the controllers are:

For slow processes, move the switch located on the 3-mode board to slow (S), proportional band

wide, and go to step 4; otherwise:

Set the switch to the fast position (F) for very fast and/or low mass processes. Use the middle

position for most others as a first try.

Set the proportional band located on the front panel to full wide (270 degrees clockwise).

Plug controller in. Turn your process on.

Observe warm-up. If it takes the process too long to reach the setpoint, make the switch setting

faster. If, on the other hand, it overshoots the setpoint by an amount that is not acceptable, a

slower switch setting should be tried.

Turn proportional band pot 1/4 turn toward narrow (counter-clockwise). Process could begin to

oscillate again. If it doesn't, proceed to step 7. If it oscillates, back up 1/8 turn clockwise.

Tighten proportional band by turning the pot counter-clockwise. Observe the process. If oscillation

continues, widen back by 1/8 turn. Continue until the process stabilizes.

Keep the controller fairly clean, and protect it from dirt, oil, and corrosion. An optional dust cover is

available for use in hostile environments.

Periodically recheck all electrical connections

Since the front panel and the meter face are plastic, do not use solvents to clean them.