Publication:
Rev
First Printing
01/93
Copyright
9 2709 00 990
G
Revised
09/01
1993-2001
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
AEC 42-7
9 2709 00 100
GENERAL INFORMATION
DESCRIPTION
The AEC 42-7 voltage regulator is designed for
use on 50/60 Hz brushless generators. The
regulator includes frequency compensation,
overexcitation shutdown, a solid-state buildup
circuit, and EMI filtering.
ELECTRICAL SPECIFICATIONS
DC Output Power
Maximum continuous: 7 Adc at 42 Vdc
10 second Forcing:
15 Adc at 90 Vdc (at
240 Vac supply
voltage)
Exciter Field DC Resistance
Minimum:
6 ohms
Maximum:
105 ohms
AC Power Input
Operating Range:
220 to 260 Vac
Phase:
1-Phase
Frequency:
50/60 Hz
Burden:
<900 VA
Sensing Input:
200-252 Vac ±10%
2-phase, 50/60 Hz at
<1 VA Burden
Voltage Adjust Range:180 to 277 Vac
Regulation Accuracy: <1% No-load to Full
load, Average Sensing
Paralleling:
Input for 5 Vac from
External CT / Burden
Resistor to allow 10%
Droop
Response Time:
Less than 1.5 cycles
for ±5% change in
sensing voltage. Link
(T C) and Adjustable
Stability to optimize re-
sponse
EMI Suppression:
Internal EMI filter
Frequency Compensation Rate:
Twice volts per Hertz
(See Figure 1 for
curve)
Overexcitation Shutdown:
Time Delayed
:
Inverse
Trip Range:
From no trip @ 50 Vdc
to instantaneous at
100. (See Figure 2.)
Disable link terminals
(N D) provided for par-
allel operation.
Voltage Buildup
Internal provision for
automatic buildup
from 6 Vac, “SoftStart”
Power Dissipation
20 watts (typical)
PHYSICAL SPECIFICATIONS
Temperature:
Operating:
-20°C to 60°C
(-4°F to 140°F)
Storage:
-40°C to 85°C
(-40°F to 185°F)
Vibration:
Withstands 1.3 G's at
2 to 27 Hz.; 0.036"
double amplitude at
27 to 52 Hz.; and 5
G's at 52 to 1000 Hz
Shock Withstands
up
to
20
G's in each of three
mutually perpendicu-
lar axes
Weight
0.68 kg. (1.5 lbs.)
FREQUENCY COMPENSATION
The frequency compensation characteristic of
Figure 1 is used to improve system load pickup
performance by restraining voltage recovery
until frequency has also started to recover.
The regulator is shipped from the factory set at
a 47 Hz”'corner frequency” for 50 Hz systems.
For 60 Hz systems, a 57 Hz corner frequency
is achieved by removing the “50-50" external
link.
OVEREXCITATION TIME DELAY
If exciter field voltage exceeds 52 ± 2 Vdc, the
regulator automatically removes the field
current, after a time delay. The time delay is
inversely proportional to the magnitude of the
detected field over voltage condition up to 95
±5 Vdc point. Beyond 95 ±5 Vdc, the field
voltage is removed at a much faster rate. This
shutdown function may be disabled for parallel
operation by linking terminals N and D
together.
INSTALLATION
MOUNTING
The regulator may be mounted on the gen-
erator in any convenient position. Refer to
outline drawing Figure 3.
Figure 4 provides the
drilling template.
EXCITER FIELD POWER CIRCUIT
Connect reg wire to the brushless exciter
field F+ terminal, and the - wire to the field F-
terminal. Refer to Figure 5.
If the exciter field resistance is less than 6
ohms, and if the full-load field current does not
exceed the maximum continuous current rating
of the regulator (7 Adc), a resistor of sufficient
wattage must be added in series with the field to
bring the total resistance to 6 ohms.
POWER INPUT
Connect wiring as shown in Figure 5. Power for
the regulator is derived from the generator
auxiliary winding, connected to wires 3 and 4.
The operable power input range is 220-260 Vac.
SENSING INPUTS
For sensing, wires U and V are connected to the
generator phase U and phase V respectively.
Wires X and Y are connected to the opposite
ends of the U and V phase coils, or commoned
together at the neutral (star) point.
QUADRATURE DROOP INPUT
When paralleling is required, a current
transformer (CT) and variable burden resistor
(rheostat) should be connected to terminals A
and B. The ratio of the CT and the maximum
value of the burden must be chosen so that at
maximum current the voltage applied to
terminals A and B does not exceed 5 Vac rms.
A suitable value of burden would be a rheostat
adjustable from 0 - 5 ohms (10 Watts) for a CT
with a 1 Aac secondary current at full load.
These terminals may either be linked or left
open when paralleling is not required.
FUSES
It is recommended that a fuse or fuses with high
interruption capability be installed per the inter-
connection diagram. A suitable fuse type would
be LittelFuse (type 3AG, rated 250 Vac, 6.3 A,
“Slo-Blo.” Dimensions are 6.3 mm x 32 mm (1
¼" x ¼").
CAUTION
The DC resistance of the exciter field must
be equal to or greater than 6 ohms and less
than 100 ohms.
NOTE
Fuse(s) MUST be installed per the
interconnection diagram to avoid
interrupting field current directly.
NOTE
The ground terminal must be bonded
either to a metal ground by the mounting
screw or by means of a cable to the most
suitable earthing point available close to
the regulator.
