Nidec LEROY-SOMER R221, Installation And Maintenance Manual

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4
2017.12 / e
Electric Power Generation
124 mm
85 mm
T1 T2 T3
T4
T5
T6
5+ 6-
T7 T8 T9
T10
T11
T12
E+ E- 0V
110
R221
P1
P2
ST3
VOLT
OPEN FOR 60 Hz STAB
POT 1K
ST4
50 Hz 60 Hz
Installation and maintenance
R221
A.V.R.
5035 en -
1 - SUPPLY
1.1 - SHUNT excitation system
The alternator with Shunt excitation is self-
excited with an R221 voltage regulator.
The regulator monitors the exciter excitation
current as a function of the alternator output
voltage. Very simple in design, the alternator
with shunt excitation has no sustaining
short-circuit capacity.
2 - R221 A.V.R.
2.1 - Characteristics
- Storage : -55°C ; +85°C
- Operation : -40°C ; +65°C
- Voltage regulation: ± 0.5%.
- Voltage supply/sensing range 85 to 139 V
(50/60 Hz)
- Rapid response time (500 ms) for a
transient voltage variation amplitude of ± 20%
- Voltage setting P1
- Stability setting P2 .
- Power supply protected by 8 A fuse, slow-
blow action (tolerates 10 A for 10 s)
The fuse is impregnated in the resin,
therefore it can not be replaced.
- Frequency: 50 Hz with ST3 jumper - 60 Hz
without ST3 jumper.
- The size of the screwdriver tip used to
adjust the potentiometer is 2.5 mm.
2.2 - R221 AVR option
Potentiometer for remote voltage
adjustment, 1000 Ω / 0.5 W min: adjustment
range ± 5%.
- Remove the ST4 jumper.
For wiring up the external potentiometer;
the “earth” wires must be isolated as
well as the potentiometer terminals
(wires at the same voltage as the power).
SHUNT SYSTEM
MAIN FIELD
STATOR : 12 wires (marked T1 to T12)
Armature
Field
Voltage
Option
Stability
Frequency
Potentiometer for remote
voltage adjustment
Varistor
2 x holes Ø 5.8 x 109 mm