Publication:
Rev
First Printing
04/90
Copyright
9 1606 00 991
F
Revised
06/2000
1997-2000
Basler Electric
Phone 618 654-2341
Route 143 Box 269
Highland IL 62249 USA
Power Systems Group
Fax 618 654-2351
http://www.basler.com
INSTRUCTIONS
FOR
VOLTAGE REGULATOR
KR4FFX/FFMX and KR7FFX/FFMX
9 1610 00 101/9 1606 00 101 and 9 1611 00 101/9 1607 00 101
INTRODUCTION
The Basler KR Series Voltage Regulators
precisely control the output voltage of an ac
electric generating system by controlling the
amount of current supplied to the exciter (or
generator) field. The KR Series Voltage
Regulators contain built-in Electromagnetic
Interferenc e (EMI) filtering and an
underfrequency roll-off characteristic.
ELECTRICAL SPECIFICATIONS
Input Power Requirements
KR4FFX/FFMX:
120 to 139 Vac (nom.),
1
1
, 60 Hz, 300 VA. 100 to 127 Vac (nom.), 1
1
,
50 Hz, 300 VA.
KR7FFX/FFMX:
208 to 277 Vac (nom.),
1
1
, 60 Hz, 840 VA. 220 to 240 Vac (nom.), 1
1
,
50 Hz, 840 VA.
Input Sensing Requirements
50 Hz, 1
1
:
1 0 0 - 1 1 0 / 2 2 0 - 2 3 0 -
240/380-400-415/500 Vac, ±10%, 60 Hz, 1
1
;
120-139/208-240/416-480/520-600 Vac, ±10%.
Input Sensing Burden
10 VA per phase
Power Output
KR4FFX/FFMX:
2.5 A @ 63 Vdc max-
imum continuous. 3.5 A @ 90 Vdc 1 minute
forcing (120 Vac input).
KR7FFX/FFMX:
3.5 A @ 125 Vdc max-
imum continuous. 5.0 A @ 180 Vdc 1 minute
forcing (240 Vac input).
Field Resistance
KR4FFX/FFMX:
25 ohms minimum, 400
ohms maximum.
KR7FFX/FFMX:
36 ohms minimum, 400
ohms maximum.
Regulation Accuracy
±1% from no-load to full-rated load and 5%
frequency variation.
Thermal Stability
±1% voltage variation for a 40
(
C (104
(
F)
change within the operating range.
Power Dissipated
<20 watts at maximum continuous rating.
Underfrequency Operational Threshold
54 Hz nominal in 60 Hz systems (see Figure 1).
44 Hz nominal in 50 Hz systems (see Figure 2).
Regulator Response
<17 milliseconds in 60 Hz systems.
<20 milliseconds in 50 Hz systems.
Frequency Compensation
Variable. Frequency roll-off is preset at the
factory for 48.5 Hz (50 Hz systems) and 58.5
Hz (60 Hz systems). Either V/Hz or 2 V/Hz can
be selected. Refer to Figures 1 and 2.
Electromagnetic Interference (EMI) Filtering
Refer to Figure 3.
PHYSICAL SPECIFICATIONS
Operating Temperature: -40
(
C (-40
(
F) to
+60
(
C (+140
(
F).
Storage Temperature: -65
(
C (-85
(
F) to +85
(
C (+185
(
F).
Weight
6.0 lbs. (2.7 kg) net. 7.0
lbs. (3.2 kg) shipping.
Vibration:
Withstands the following:5
to 26 Hz at 1.2 g. 27 to 52 Hz at 0.036 inch
double amplitude. 53 to 260 Hz at 5.0 g.
Shock:
Withstands 20 g in each
of three mutually perpendicular planes.
Mounting
The unit is designed to
operate when mounted directly on a diesel or
turbine driven generator system. The unit can
also be mounted in switchgear or control
panels.
Accessories
The KR Series Voltage Regulator is designed
to be compatible with any of the following listed
accessories and equipment.
1. VAR/Power Factor Controller (SCP 250)
2. Series Boost Option
3. Current Transformers (CT2 through CT50)
4. Minimum/Maximum Excitation Limiter (EL
200)
5. Auto-Synchronizer (BE3-25A)
6. Auto-Synchronizer (BE1-25A)
7. Line Drop Compensator (LDC 300)
CONTROLS
External Voltage Adjust
This 175 ohm, 25 watt rheostat is supplied as a
loose item for remote panel mounting. It
provides an adjustment of ±10% of the nominal
voltage of the regulated generator voltage.
When connected as shown in Figure 4,
adjustment of the rheostat to maximum
resistance (CCW) will obtain minimum
generator voltage output. Maximum generator
voltage output is obtained by turning the rheo-
stat clockwise (CW) to the minimum resistance
position.
Voltage Range Adjustment
This screwdriver adjustment is factory set to
establish the nominal ranges of sensing
voltages associated with 60 Hz operation. If 60
Hz sensing is used, this control will not
normally need adjustment.
When nominal 50 Hz sensing voltages are
required, this control is used to establish the
desired nominal sensing voltage. This is done
in the following manner.
(1) Set the External Voltage Adjust Rheostat
to the middle of its adjustment range.
(2) Ensure that the appropriate sensing
voltage connection is made (refer to Figure 4)
and that the 50 Hz connection is made.
(3) With the regulator properly connected into
the system (Figure 4), bring the generator up to
rated frequency (50 Hz).
(4) While watching the generator voltmeter,
adjust the Internal Voltage Range Adjustment
until the nominal generator voltage is obtained.
(Voltage increases with CW rotation.)
After the internal Voltage Range Adjustment
has been properly set, the External Voltage
Adjust Rheostat will provide a voltage
adjustment of ±10% of nominal (both 50 and 60
Hz systems).
Stability Adjustment
This screwdriver adjustment adjusts the system
stability by controlling the amount of feedback
that is applied to the Sensing and Gating
Circuitry. Normally, it is factory preset near the
extreme clockwise (CW) position. This setting
normally assures good stability, but tends to
slow the response time of the generator. If
rotated counterclockwise (CCW), the system
response time becomes faster. However, if
rotated too far CCW, the generator voltage may
oscillate (hunt). It should then be rotated CW
well above the point where oscillating occurred.
The system voltage stability is most critical at
no-load. If a setting is desired that provides the
fastest possible voltage response with good
generator stability, an oscilloscope or some
load transient voltage recording device should
be used.
Sensing Transformer Reconnection
An internal sensing transformer has provisions
for the following voltages:
60 Hz: 120-139/208-240/416-480 and 520-
600; ±10%
50 Hz: 100-110/220-230-240/380-400-415
and 500; ±10%
The transformer is normally factory connected
to the 120 Vac tap and must be reconnected to
another tap before operation if a voltage other
than the 120 Vac sensing is used.
Reconnection is facilitated through the use of
solderless connectors. Figure 4 shows the
sensing transformer location and the voltage
tap identification.
INSTALLATION
General
The Regulator must be connected to the
generator system as instructed in this section
and as shown in the basic interconnection
diagram (Figure 5).
Input Power (Terminals 3 and 4)
The voltage regulator operates on a power
input voltage applied to terminals 3 and 4. If
the correct voltage is not available at the
generator, or if the field flashing circuit is
grounded, a power isolation transformer must
be used. The transformer is not furnished with
www
. ElectricalPartManuals
. com