Usage:
A DC controlled reactor is used in self regulated constant voltage generators with serial numbers from 1 to 599. These generators can come connected for any of the voltages that follow:
NOTE: Both voltages of a (120/208, 120/240, or 240/480) single voltage generator can be used at the same time. On the (120-240, 200-400 or 240-480) 10 wire dual voltage generators the leads can be connected to get one or the other of the voltages, but not both at the same time. Rated voltage on dual voltage generators is for a line to line connection. A line to neutral connection will give 58% of the rated voltage.
| NOTICE |
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If the generator is operated at a voltage that is different than nameplate rating; you must operate with a different kW output limit. Use the formula that follows to find the kW limit for voltages other than nameplate. |
I and P.F. are constant, at nameplate rating. If output voltage is changed, the three phase kW limit will change.
Example:
The generator must not be operated at above nameplate rated amperes.
Three Phase Generators
120/208 Volt Generators
Saturable reactor (A) has the common tap connected to DC controlled reactor (C). The 120V tap is connected to generator lead (T2) through regulator terminal (10). The generator neutral (T0) is connected to the regulator through regulator terminal (2).
120/208 V generators can be made to give 127/220V or 139/140V service. If the wire on the 120V tap is moved to the 127V tap, the generator will give 220V line to line and 127V line to neutral.
| NOTICE |
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The kW, KVA and ampere output of the generator must be limited to less than nameplate rating to help prevent damage to the generator field windings. |
To calculate the reduction necessary, use the formula that follows:
If the wire on the 120V tap is moved to the 139V tap, the generator will give 240V line to line and 138V line to neutral.
The output of the generator must be limited to:
NOTE: When a 120/208 self regulated constant voltage generator is to be operated in parallel with a 120/208V "N" or "K" series self regulated saturated field generator, the saturable reactor must be connected to use the common and 127V taps.
NOTE: Make a mark (show new location) on the nameplate of the generator when saturable reactor taps are changed from the original location.
120/208 VOLT GENERATOR CONNECTIONS
A. Saturable reactor. B. Voltage droop resistor (if so equipped). C. DC controlled reactor. D. Voltage droop rheostat. E. Full wave rectifier. F. Voltage level resistor (if so equipped). G. Blocking rectifier. H. Voltage level rheostat. I. Generator field. J. Exciter armature. K. Exciter field. L. Exicter control field. M. Generator armature. 1,2,3,4,5,6,7,8,9,10 and 11. Regulator terminals. A1 and A2. Exciter armature leads. C1 and C2. Generator field leads. F1 and F2. Exciter field leads. S1 and S2. Exciter control field leads. T0, T1, T2 and T3. Generator leads (outside generator).
120-240 Volt Generators
The phase windings are connected in parallel for 120V or in series for 240V.
Saturable reactor (A) has the common tap connected to DC controlled reactor (C). The 120V tap is connected to phase winding lead (t8) through regulator terminal (10) Phase winding lead (t9) is connected to the regulator through regulator terminal (2).
NOTE: On this generator, the regulator is always connected to a 120V source. 240V comes from the connection of two sets of phase windings in series.
120 VOLT GENERATOR CONNECTION
2 and 10. Regulator terminals. t1 through t9. Phase winding leads (inside generator). T0, T1, T2 and T3. Generator leads (inside generator).
A. Saturable reactor.
B. Voltage droop resistor (if so equipped).
C. DC controlled reactor.
D. Voltage droop rheostat.
E. Full wave rectifier.
F. Voltage level resistor (if so equipped).
G. Blocking rectifier.
H. Voltage level rheostat.
I. Generator field.
J. Exciter armature.
K. Exciter field.
L. Exciter control field.
M. Generator armature.
1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11. Regulator terminals.
240 VOLT GENERATOR CONNECTION
A1 and A2. Exciter armature leads.
C1 and C2. Generator field leads.
F1 and F2. Exciter field leads.
S1 and S2. Exciter control field leads.
t1 through t9. Phase winding leads (inside generator).
T0, T1, T2 and T3. Generator leads (outside generator.)
240-480 Volt Generators
The phase windings are connected in parallel for 200V and 240V or in series for 400V and 480V.
Saturable reactor (A) has the common tap connected to DC controlled reactor (C). The 139V tap is connected to phase winding lead (t8) through regulator terminal (10). The generator neutral (T0) is connected to the regulator through regulator terminal (2).
NOTE: The saturable reactor tap is the same for:
- 240-480 Volts 60HZ240-480 Volts 50HZ200-400 Volts 50HZ
240-480 and 200-400V at 50 HZ is made possible by adjustment of the voltage level rheostat.
240-480V generators can be made to give 220-440V or 208-416V service. If the wire on the 139V tap of the saturable reactor is moved to the 127V tap, the generator will operate as a 220-440V unit. The generator can give nameplate rated amperes but because of the voltage reduction the available kW and KVA will be 92% of the nameplate rating.
If the wire on the 139V tap is moved to the 120V tap, the generator will operate as a 208-416 unit. The generator can give nameplate rated amperes but because of the voltage reduction the available kW and KVA will be 87% of the nameplate rating.
NOTE: Make a mark (show new location) on the nameplate of the generator when saturable reactor taps are changed from the original position.
240 VOLT GENERATOR CONNECTION
2 and 10. Regulator terminals. M. Generator armature. T0, T1, T2 and T3. Generator leads (outside generator). t1 through t9. Phase winding leads (inside generator).
A. Saturable reactor.
B. Voltage droop resistor (if so equipped).
C. DC controlled reactor.
D. Voltage droop rheostat.
E. Full wave rectifier.
F. Voltage level resistor (if so equipped).
G. Blocking rectifier.
H. Voltage level rheostat.
I. Generator field.
J. Exciter armature.
K. Exciter field.
L. Exciter control field.
M. Generator armature.
1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11. Regulator terminals.
480 VOLT GENERATOR CONNECTION
A1 and A2. Exciter armature leads.
C1 and C2. Generator field leads.
F1 and F2. Exciter field leads.
S1 and S2. Exciter control field leads.
t1 through t9. Phase winding leads (inside generator).
T0, T1, T2 and T3. Generator leads (outside generator).
600 or 2400 Volt Generators
Saturable reactor (A) has the common tap connected to DC controlled reactor (C). The 120V tap (127V tap on the D375 2400V generator) is connected to the phase windings of (T2) through regulator terminal (10). The generator neutral (T0) is connected to the regulator through regulator terminal (2).
NOTE: For more information on the exact location of the phase winding tap for the regulator reference lead make reference to REWIND INFORMATION.
This arrangement gives no more than 139V at the saturable reactor. This is the highest voltage in the regulator compartment.
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A 2400 volt generator must not be operated, even on open circuit, without a good ground connection made to (T0). |
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A. Saturable reactor.
B. Voltage droop resistor (if so equipped).
C. DC Controlled reactor.
D. Voltage droop rheostat.
E. Full wave rectifier.
F. Voltage level resistor (if so equipped).
G. Blocking rectifier.
H. Voltage level rheostat.
I. Generator field.
J. Exciter armature.
K. Exciter field.
L. Exciter control field.
M. Generator armature.
1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11. Regulator terminals. A1 and A2. Exciter armature leads. C1 and C2. Generator field leads. F1 and F2. Exciter field leads. S1 and S2. Exciter control field leads. T0, T1, T2 and T3. Generator leads (outside generator.)
600 or 2400 VOLT GENERATOR CONNECTION
Single Phase Generators
A three phase generator can be connected to give 2 or 3 wire single phase current. When a three phase generator is connected for single phase operation, it will give 57% of its three phase kW and KVA rating.
120-240 Volt Generators
2 WIRE LOW VOLTAGE
10 and 2. Regulator reference leads. t1 through t9. Phase winding leads (inside generator). T0, L1 and L2. Generator leads (outside generator)
The 2 wire low voltage connection will give 120V line to line. The phase winding leads are connected in parallel. The saturable reactor has the common tap connected to the DC controlled reactor. The 120V tap is connected to phase winding lead (t8) through regulator terminal 10. Phase winding lead (t9) is connected to the regulator through regulator terminal 2. Leads (t1, t4, t7 and T0) are not used for single phase service an must be carefully insulated.
2 WIRE HIGH VOLTAGE
10 and 2. Regulator reference leads. t1 through t9. Phase winding leads (inside generator). T0, L1 and L2. Generator leads (outside generator.
The 2 wire high voltage connection will give 240V line to line. The phase winding leads are connected in series. The saturable reactor has the common tap connected to the DC controlled reactor. The 120V tap is connected to phase winding lead (t8) through regulator terminal 10. Phase winding lead (t9) is connected to the regulator through regulator terminal 2. Leads (t1, t4, t7 and T0) are not used for single phase service and must be carefully insulated.
3 WIRE HIGH-LOW VOLTAGE
10 and 2. Regulator reference leads. t1 through t9. Phase winding leads (inside generator). T0, L1, L2 and N. Generator leads (outside generator).
The 3 wire high-low voltage connections will give 120V L1 to N and L2 to N. It will give 240V L1 to L2. The phase windings are connected in parallel. The saturable reactor has the common tap connected to the DC controlled reactor. The 120V tap is connected to phase winding lead (t8) through regulator terminal 10. Phase winding lead (t9) is connected to the regulator through regulator terminal 2. Leads (t1, t4, t7 and T0) are not used for single phase service and must be carefully insulated.
NOTE: 120/240 single phase generators can be adjusted to give 110/220V or 115/230V.
Connections for 50 cycle, 1 phase, 120/240V generators are the same as those shown for 120/240 V, 60 cycle, 1 phase generators.
240-480 Volt Generators
2 WIRE LOW VOLTAGE
2 and 10. Regulator reference leads. t1 through t9. Phase winding leads (inside generator). T0, L1 and L2. Generator leads (outside generator).
The 2 wire low voltage connection will give 240V line to line. The phase windings are connected in parallel. The saturable reactor has the common tap connected to the DC controlled reactor. The 139V tap is connected to generator lead (t8) through regulator terminal 10. Generator lead (T0) is connected to the regulator through regulator terminal 2. Generator leads t1, t4 and t7) are not used. They must be carefully insulated.
2 WIRE HIGH VOLTAGE
2 and 10. Regulator reference leads. t1 through t9. Phase winding leads (inside generator). T0, L1 and L2. Generator leads (outside generator).
The 2 wire high voltage connection will give 480V line to line. The phase windings are connected in series. The saturable reactor has the common tap connected to the DC controlled reactor. The 139V tap is connected to generator lead (t2) through regulator terminal 10. Generator lead (T0) is connected to the regulator through regulator terminal 2. Generator leads t1, t4 and t7) are not used. They must be carefully insulated.
3 WIRE HIGH-LOW VOLTAGE
2 and 10. Regulator reference leads. t1 through t9. Phase winding leads (inside generator). T0, L1, L2 and N. Generator leads (outside generator).
The 3 wire high-low voltage connection will give 240V, L1 to N and L2 to N. It will give 480V L1 to L2. The phase windings are connected in series. The saturable reactor has the common tap connected to the DC controlled reactor. The 139V tap is connected to phase winding lead (t8) through regulator terminal 10. Generator lead (T0) is connected to the regulator through regulator terminal 2. Phase winding leads (t1, t4 and t7) are not used. They must be carefuly insulated.
Connections for 50 cycle, 1 phase, 200/400 and 240/480V generators are the same as those shown for 240/480V, 60 cycle, 1 phase generators.