Ransburg 9060 LV Auto Cascade 80120-XXX - Manual (Page 36)

9060 Cascade Low Voltage Controller - Operation
31 CP-13-02.2
DI/DT CONFIGURATION
(For 80100-51X Units Only)
The 9060 Voltage Controller, model 80100-51X,
for use with the ATEX approved Aerobell 168
applicator, contains a di/dt (rate of change in
current with respect to time) safety overload
fault and is used in addition to the standard
current overload fault. This is an adjustable
setting which determines the maximum current
increase that can occur during a specific time
period. Both the time period and sensitivity of
the DI/DT configuration can be adjusted to
maximize detection.
The di/dt detection feature improves the ability
of the power supply to prevent discharges from
the applicator to a grounded object when the
object is approaching the applicator at fast
speeds. Slow rates of approach are typically
sensed by the current overload. The di/dt and
current overloads must be set correctly to
prevent discharges.
The controller monitors the output current
values and compares the average rate of
change over the selected time interval to the
user specified settings to determine if a fault
condition has occurred. If a fault occurs, the
unit with turn off the high voltage and display
the “dOL” fault code as shown in the “Fault
Descriptions” section of this manual.
(For 80100-51X Units ONLY)
Every time the high voltage is triggered
(turned on), there is a 4 second timer that
inhibits the DI/DT overload fault
while
the applicator is being charged. Ensure
that NO OBJECTS approach the bell dur-
ing charging.
!
W A R N I N G
Adjusting DI/DT Parameters
The di/dt safety overload fault is configured
based upon two (2) parameters; Sensitivity
(SE), and Sample Time Interval (SA). These
parameters can abe adjusted in the Parameter
Adjustment Mode. Refer to the “Parameter
Adjustment Mode” portion of the “Operation”
section of this manual for information on
adjusting these parameters.
The sensitivity (SE) parameter determines the
amount of current change that must be exceed-
ed during the sampling time interval. The
following table specifies the average amount of
current change that must occur during the time
interval to produce a fault based on each SE
setting.
Sensitivity Values
SE Setting
Average Rate of Change
(per sampling interval)
(Most Sensitive) 2.0 4uA
3.0 6uA
4.0 8uA
5.0 10uA
6.0 12uA
7.0 14uA
8.0 16uA
9.0 18uA
10.0 20uA
11.0 22uA
(Least Sensitive) 12.0 24uA
The sample time interval (SA) parameter
determines the number of samples that must be
collected before a rate of change calculation is
performed. This parameter can be set from 2 to
50 with a sample taken every 10 ms. This
produces a sample time interval range from
20ms to 500ms. Using a larger time interval
produces a di/dt configuration that is less
sensitive to current spikes which are averaged
out over the sample time interval and can be
used to remove nuisance faults.