Athena 3020 Series Gebruiksaanwijzing - Pagina 10

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Output Function

Switches

NOTE:

Reconfigured or

field-modified units

should always be

checked to assure

that output switch

positions are cor-

rect.

Adjustments

How to Configure Output Function Switches

There is a switch assembly on the bottom board (see bottom

board illustration). This four-position switch regulates cycle

time and output selection. It is factory-configured for the plug-

in output ordered. Check the output function chart to make

sure the configuration is correct for your application. Figure 5.

Switches 1&2: These switches act together to select either

proportional current output or one of the time

proportioning cycle times. (See the output

function switch chart.) Use longest times to

get best relay life expectancy. If meter shows

temperature swings following each "on" cycle,

select a faster time to reduce "ripple."

Switch 3: Selects either on/off or proportional action.

"On" provides proportional action. "Off" pro-

vides on/off action.

Switch 4: Selects output for either mechanical or solid

state relays.

On: Provides slow proportional times for

Off: Provides 20 mAdc when used with the "F"

NOTE: Switch 4 changes the cycle times in conjunction with

switches 1 and 2. Check output function switch chart.

Proportional Band Adjustments for All Outputs

The proportional band adjustment widens or narrows the

band over which proportional action occurs. Too narrow a

band can cause the temperature to swing about the setpoint.

This can be seen on the deviation meter. Too wide a band

can cause an error between the setpoint and the actual tem-

perature (droop error) as measured at the sensor.

Proper setting of this adjustment is the point where the tem-

perature swings just stop. When adjusting the proportional

band control, do so in small increments, allowing time

between each adjustment for the process to stabilize.

Turning the adjustment in a clockwise direction widens the

proportional band and should reduce swings to straight line

control with most processes.

Offset (Manual Reset)

After the proportional band is set, the process temperature

may stabilize at a point other than the setpoint, high or low, as

shown on the deviation meter. This can be corrected with the

offset (manual reset) adjustment. If the deviation meter indi-

cates a low temperature, turn the offset (manual reset) adjust-

ment clockwise (+ direction) until the deviation meteris at

zero. Turn the offset (manual reset) adjustment counter-clock-

mechanical relays

module or fast time proportioning times

when used with "S" or "T" modules.