Basler Electric BE350 - Manual (Page 2)

Publication
9166800893
Revision
-
Instructions
Date
09/10
Page
2 of 4
CAUTION
The exciter field dc resistance must be no less
than 21 ohms.
If the exciter field dc resistance is less than 21 ohms and
the full-load field current does not exceed the maximum
continuous current rating of the controller, a resistor of
sufficient wattage must be added in series with the field to
increase the total resistance to 21 ohms.
FREQUENCY COMPENSATION
The frequency compensation feature improves system load
pickup performance by restraining voltage recovery until
the frequency has also started to recover. Figure 3
illustrates the underfrequency characteristics of the BE350.
The corner frequency range is set for 50 hertz or 60 hertz
by connecting the Corner Frequency jumper to the
appropriate terminal. Refer to Controls, Jumpers for details
about selecting the corner frequency range.
The corner frequency setting is adjusted by the
Underfrequency control (potentiometer). Clockwise rotation
of the Underfrequency control increases the corner
frequency and counterclockwise rotation decreases the
corner frequency. If user adjustment of the factory-set
potentiometer is desired, follow the Preliminary Setup and
System Startup procedures.
INSTALLATION
Mounting
The BE350 controller may be mounted on the generator in
any convenient position. Figure 4 shows the mounting
dimensions. Dimensions are shown in inches with
millimeters in parenthesis.
The recommended mounting hardware is two #8 or M4
screws tightened to a torque of 9 inch-pounds (1 newton
meter). Nylon-lined locking nuts are recommended when
installing the controller with loose hardware.
Connections
BE350 controller terminals consist of quarter-inch, quick-
connect tabs.
Figure 5 shows typical connections for the BE350
controller.
OPERATING PROCEDURES
The following procedures can be used when adjusting the
BE350 controller. Symptoms caused by certain generator
system problems or a faulty controller are included along
with suggested remedies.
CAUTION
Meggers and high-potential test equipment must
not be used. Use of such equipment could damage
the semiconductors contained in the controller.
Preliminary Setup
Complete the following steps before proceeding with
system startup.
1.
Verify that the BE350 specifications conform with the
requirements of the generator system.
2. Ensure that the controller jumpers are positioned as
follows.
a.
If a remote voltage adjust rheostat will not be
used, ensure that the Voltage Adjust Rheostat
jumper is connected across terminals 6 and 7.
b. If a 55 hertz corner frequency for a 60 hertz
system is desired, connect the Corner Frequency
jumper to the 60 Hz terminal. If a 45 hertz corner
frequency for a 50 hertz system is desired,
connect the Corner Frequency jumper to the
50 Hz terminal.
3. Ensure that the connections between the generator
system and the controller are correct.
4. Set the BE350 Voltage control fully counterclockwise
and the remote voltage adjust rheostat (if used) to the
center position.
5. Adjust the BE350 Stability control fully clockwise. This
provides the most stability and the slowest response.
6. If user adjustment of the Underfrequency control is
required, start with the potentiometer adjusted to the
fully counterclockwise position. Then, slowly adjust the
potentiometer clockwise to set.
System Startup
NOTE
Use an average-reading voltmeter for all voltage
readings.
1. Perform the steps under Preliminary Setup.
2. Start the prime mover and bring it up to rated speed.
Generator voltage should build up.
3. Slowly adjust the BE350 Voltage control (or remote
voltage adjust rheostat) until the generator voltage
reaches the nominal level.
If the voltage does not build up to the rated level,
check the generator output for excessive load or a
short-circuit.
4. Apply and remove the generator load to verify stability.
If the generator responds too slowly or hunts
(oscillates), check the generator output for excessive
load or a short-circuit. Adjust the controller’s Stability
control with no load applied.
5. Check regulation under normal operating conditions. If
the regulation is poor:
a.
Verify that the prime mover is operating at rated
speed.
b. Verify that the voltmeter is connected to the same
point as the controller sensing.
c. Use an average-sensing voltmeter (not an rms-
sensing voltmeter).