Ransburg MicroPak LECU5004 - Manual (Page 31)

MicroPak - Operation
Ransburg
28 LN-9218-00.13
DIAGNOSTICS
Fault Conditions
These are conditions that turn off the HV ON mode,
signal the operator and require an HV Reset signal
before HV can be turned on again.
Over Current
The MicroPak is designed to turn off HV anytime
the output current exceeds a threshold determined
by the Over Current Setpoint level. Overcurrent
setpoint is important and must be set to the lowest
functional setting. In an event where a HV cable
should fail or an electrical discharge may occur,
or if the applicator, supply lines, or other factors
cause abnormal increase in current, circuit will
shut off. Typical set point is 1.3 - 1.5 times the
normal running current during operation.
† In the Current Regulation mode, the
actual threshold is 30% higher than the
set point. This allows the set point to con-
trol the level at which the current is regu-
lated without having Over Current faults.
NOTE
Di/dt
The Di/dt Fault monitors the rate of change of
current and shuts down the High Voltage if this
exceeds a threshold. The operation is fully ex-
plained in the “Operations” section.
Overvoltage
The Over Voltage Fault monitors output kV feed-
back and shuts down the High Voltage if this
exceeds setpoint by more than 10 kV for more
than 5 seconds. This can occur when equipment
discharges too slowly after a voltage setpoint
reduction. An overvoltage fault is indicated on
the front panel by the FB led flashing on and off.
FB Fault
The Feedback Fault monitors the HV and Current
feedback signals from the cascade for abnormal
signal levels. When high voltage is off, a FB Fault
indicates, in general, one of two conditions: (1) an
open circuit in the connection between the control-
ler, caused by a broken wire or bad connection, or
(2) a situation where HV is actually present even
though the MicroPak is not generating it, either
from another HV source or because the MicroPak
has been recently turned off and there is a very
large amount of energy storage in the HV load,
causing the HV to decay very slowly. When high
voltage is on, a FB Fault indicates that there is
sufficient drive being sent to the cascade but no
feedback on either or both of the kV and Current
feedback signals. This could be caused by a
faulty or disconnected cable or a faulty cascade.
HV Held In Reset
This signal indicates the MicroPak is seeing an
HV Reset input and cannot turn on HV until the
HV Reset signal is removed.
Status Indications
The following indicates conditions which the op-
erator may need to know, but do not interrupt the
HV ON status:
kV Out of Tolerance (RP1000 mode)
This signal indicates a condition when, in HV ON
status, the kV feedback is over or under the kV
setpoint by 5% in direct charge modes and over
by 5% or under by 15% in Indirect Charge modes.
This is in effect in Remote Mode only. This con-
dition must be present for 5 seconds before the
signal goes active.
Under Current (RP1000 mode)
This signal indicates a condition where the out-
put current is lower than it should be (in order to
detect a failed or disconnected HV cable). This
is in effect in Indirect Charge Modes only.
† FM listed current overloads to approx.
50µA above the highest observed operating
current.
C A U T I O N !