Precision Control Systems 1029C - Manual (Page 17)

MODEL 1029C 13 10/19/2007
FEEDBACK SELECTION
Connector P2 on the circuit board allows the selection of
feedback type. (See Figure 18 ).
True RMS is the default voltage feedback mode. Average
voltage feedback mode may be requested when ordering
the controller.
Voltage feedback may be selected by placing the jumper
across pins P2-4 and P2-7. (VFB)
Current feedback may be selected by placing the jumper
across P2-3 and P2-8. (IFB)
Power feedback, if factory installed, may be selected by
placing the jumper across P2-5 and P2-6. (PFB)
External feedback may be connected between terminals
P1-14 (Common) and P1-18 (FD. BK.) on the command
connector (See Figure 19 ).
A 0-5Vdc signal may be used for external feedback when
the jumper is placed across pins P2-2 and P2-9 (EXT).
A 0-100uA signal may be used for external feedback when
the jumper is placed across pins P2-1 and P2-10 (SJ).
Average voltage and True RMS voltage are of the
feedforward technique.
START-UP
Determine that the selected transformer tap corresponds to
the line voltage.
If the customer wishes to determine that the controller and
the command signals are wired and operating correctly
before applying power to the load, the following procedure
may be followed.
A load capable of drawing at least one amp must be
connected for the controller to operate properly.
1. Move the feedback jumper to pins P2-4 & P2-7 to select
Voltage FB. (See Figure 18 .)
2. Determine that terminals P1-10 & P1-11 are electrically
connected. Apply a command signal to the run
command signal input.
3. Set the command signal to zero before applying system
power. The load voltage should start at zero and
increase as the command signal is increased, reaching
optimum line output when command signal is maximum.
4. Remove system power from controller. Remove
electrical connection from between P1-10 & P1-11.
Apply a command signal to the idle command signal
input and repeat step 3.
The load voltage and current may be measured with any
meter. However, for accurate RMS voltage
measurements use a True RMS responding meter. Use
an average responding meter for average voltage
measurements.
5. When start-up tests have been completed, move the
feedback jumper to select the desired operating
feedback.
The controller was calibrated at the factory.
If adjustments appear necessary, see the zero and span
adjustment instructions on page 14 .
Care is urged whenever working near high voltages, and it
is recommended that installation and service be done by a
licensed electrician or experienced technician.