Barber-Colman 7EM Instruction Manual - page 17
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P23 Automatic modification of relative cooling gain
Available only when P4 = HC.
OFF
= Autotuning (Smart AT) does not modify
“relative cooling gain.”
ON
= Autotuning modifies “relative cooling gain.”
P24 Output maximum rate of change
Sets the maximum rate of change of the power output.
P24 is programmable from 1 to 10% of the control output.
When over 10%, the upper display is blank and the rate
of change has no limit.
P25 Parameter display parameters
Available when P18 is different from 0.
OFF
= Protected parameters are not displayed.
ON
= Parameters are always displayed.
P26 Autotuning (Smart AT) enable/disable
0
= Autotuning disabled.
1
= Autotuning enabling/disabling is not
protected by safety lock.
2
= Autotuning enabling/disabling is protected by
safety lock.
P27 Maximum value of the proportional band set by
autotuning
Available only when P26 is different from 0.
Can be programmed from P28 or P29 value to 99.9.
P28 Minimum value of the proportional band set by
autotuning in heating control only
Available only when P26 is different from 0 and P4 = H.
Can be programmed from 1.0% to P27 value.
P29 Minimum value of the proportional band set by
autotuning in heating/cooling control only
Available only when P26 is different from 0 and P4 = HC.
Can be programmed from 1.5% to P27 value.
P30 Minimum value of integral time settable by
autotuning
Available only when P26 is different from 0.
Programmable from 00.1 (10 seconds) to 02.0 (2 minutes).
P31 Extension of the anti-reset windup
Range from -30 to +30% of the proportional band.
NOTE:
A positive value increases the high limit of the
anti-reset windup (over setpoint) while a
negative value decreases the low limit of the
anti-reset windup (under setpoint).
This completes the configuration procedure. The display
should show “COnF”. Close switch V2, see configuration
procedure Figure 2.
OPERATING MODE
1) Remove the instrument from its case.
2) Close switch V2 (see configuration procedure Figure 2).
3) Re-insert the instrument in its case.
4) Switch on the instrument.Operating Key Functions
FUNC
= The new setting of the selected parameter
is stored and the next parameter is
displayed (in increasing order).
AT
= Enable/disable the autotuning (Smart AT)
function (hold for two seconds).
s
= Increases the setting of the selected parameter
or displays the heating load current.
t
= Decreases the setting of the selected
parameter.
NOTE:
There is a 10 second time-out for parameter
modification. If no keys are pressed during this
time period, the instrument automatically goes
to the “normal display mode” and the last
parameter is not changed.