Barber-Colman 7EM Instruction Manual - page 18
18
Setpoint Access
When the device is in the AUTO mode and the “normal
display mode,” the setpoint can be directly accessed and
modified.
1) Press the
s
or
t
key (and hold for 3 seconds); the
setpoint will start to change.
2) Once the desired setting is reached, wait 3 seconds
before pressing a key and the new setpoint will be used.
Manual Reset of the Alarms
If the alarm has been configured as a lached alarm, the
alarm status will persist after the alarm condition has
disappeared.
To reset the alarm, press the FUNC key to select the
“n.rS” parameter (the display will show “n.rS” and “OFF.”
Use the
s
and
t
keys to select “ON” and press the
FUNC key again.
The alarm reset action will only be successful if the alarm
condition has disappeared.
Autotuning (Smart AT) Function
Autotuning is automatically optimizes the control action.
To enable autotuning, press the AT key for more than 1.5
seconds. The autotuning LED will light or flash according
to the algorithm selected. When autotuning is enabled,
it is possible to display but not modify the control
parameters (PB, TI, TD. For rC, see P23). Press the AT
key for more than 1.5 seconds to disable autotuning and
return to the normal (PID) control mode. Once autotuning
is turned off, the instrument maintains the calculated
control parameters, but allows the parameters to be
modified.
NOTES:
1) When ON/OFF control is programmed (PB = 0),
autotuning is disabled.
2) Autotune enable/disable can be protected by the
safety lock password (see P26 in the Configuration
Procedure).
Enable/Disable the Control Output
With the instrument in the “normal display mode,” press
and hold (for 5 seconds) the
s
key and the FUNC key to
disable the control outputs. The device will function as
an indicator. All control outputs will be off and the word
“OFF” will be appear on the lower display. Alarms will
be in a non-alarm condition.
Press and hold (for 5 seconds) the
s
key and the FUNC
key a second time to restore the control status. If the
alarm standby has been configured, alarms will respond
as though it were a powerup condition.
Lamp Test
Pressing the
t
+ FUNC keys initiates a Lamp Test. All
display segments and LED’s will light with a 50% duty
cycle. No timeout is applied to a lamp test. Pressing
the
t
+ FUNC keys returns the instrument to the “normal
display mode.”
OUT 1 Heater Breakdown Alarm
The instrument measures the OUT 1 current and
generates an alarm if the current is lower than the “Hbd”
setpoint. A fault condition is shown by the “AL2/HB”
LED flashing and by the “AL2/HB” relay status. Press
the
s
key to display the current. The lower display will
show the current in engineering units (a 2 digit number
followed by the letter “A.” The
s
key will return the
instrument to the “normal display mode.”
The load current is sampled only if the power output has
been applied to the load for a minimum time of 50 ms. If
no load current measurements are going to be performed
for one cycle (CY1), the displayed current value will start
to flash. In configuration, parameter P16 is used to select
the type of contact (N.O. or N.C.) used to drive the load.