Ransburg MicroPak Controller A11789 - Manual (Page 20)

0 to 10VDC kV setpoint input. When in local
mode, the over-current setpoint is adjusted by
using the uA Adjust Knob. When in remote mode
the overcurrent setpoint is adjusted by potenti-
ometer R21 if dipswitch SW3-1 is OFF, or by the
remote 0 to 10VDC over-current setpoint input if
dipswitch SW3-1 is ON.
Feedback Fault Indicator
Glows yellow whenever a feedback fault occurs.
The feedback fault monitors the HV and current
feedback signals from the cascade for abnormal
signal levels. A feedback fault indicates a pos-
sibleopen circuit between the controller and the
cascade located in the Evolver applicator. Check
the low voltage cable and its’ connections for the
cause. When high voltage is on, a feedback fault
may also indicate a defective cascade. If the
Feedback Fault Indicator comes on and flashes,
this indicates a board malfunction. In this case,
the MicroPak Control Unit should be removed
from service and sent back to Ransburg for re-
pair.
Local/Remote Switch
Determines whether the MicroPak Control Unit
is in local or remote mode. In local mode the kV
and over-current setpoints come from the front
panel kV and μA Adjust Knobs, respectively. In
remote mode, the kV setpoint comes from the
remote analog 0-10VDC kV input and the cur-
rent setpoint comes from either R21 at the top of
the MicroPak process Board (see Figure 6A) or
from the remote analog 0-10VDC Over-Current
Setpoint input, depending on the setting of dip-
switch SW3-1.
Microamp Meter Display
Displays current in millionths of amps (micro-
amps) being drawn from the applicator electrode.
OPERATING
PROCEDURES
(See Figures 2 & 8 for Operating Controls)
Typical Local Mode
1. Ensure the AC power, safety ground, low volt-
age cable, and interlock connections are made
as described in the “Installation” section of this
manual.
2. Turn the high voltage adjustment knob fully
counter-clockwise.
3. Turn the AC Power ON/OFF switch (see Fig-
ure 2) to the ON position. When the AC power
is on the green CPU Indicator on the front of the
discreet I/O module will illuminate.
4. Turn the MicroPak ON/OFF switch to the ON
position. The kV and μA displays will come on
along with the yellow MicroPak Power Indicator
located above the switch.
5. Momentarily push the High Voltage Enable
Switch to the ON position. Assuming dipswitch
SW3-3 is off, the red High Voltage On Indicator
should turn on.
6. Using the kV Adjust Knob set the kV output to
the desired value as displayed on the kV Meter.
Ensure the over-current setpoint is set above,
or at for current control, the maximum expect-
ed current, or an overload fault will occur. The
over-current setpoint can be adjusted by turning
the μA Adjust Knob with the View/Change Set-
point Switch held in.
7. To turn high voltage off, momentarily move the
High Voltage Enable Switch to the OFF position.
8. When finished spraying, turn the AC Power
ON/ OFF Switch (see Figure 2) to the OFF posi-
tion to prolong the life of the internal fan.
MicroPak Controller - Operation
18
Ransburg
CP-06-01.1