Schematic Symbols. Electrical System

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Sylvia Phelps
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1 chematic ymbols lectrical ystem RY CI FF WICH H WIH MR CRR IMIR GR I PH-P CIRCI RKR WICH RKR F CHCK VV RMY P () RMY C (C) King ir 200 eveloped for raining Purposes 4-1 ctober 1998

2 C imuflite C lectrical ystem King ir 200 RIGH RR G H RIGH G RVR CRR PRCI RVR CRR PRCI F G X PWR RY RY CHRG R 364 FR RIGH Y F PMP F Y F PMP HRH F FIRW HFF VV RIGH FIRW HFF VV F FIR X RIGH FIR X F RR G H R Y H H C RIGH R RY XR PWR PG-GG R RY W RY RY F C + X PWR CCI 1 1 RY RY X PWR RY VR V PR FR F R RY II IMIR 32 M I R Y I I F PI H W C IGH W F FW 225 FR VIIC MR F I MP IICR F IC V PRP YCHRPHR CI PRR FIGH IRM IGH VRH I P IGH F IR WRIG CIR PWR PMIC RFC IC PI' R IP IICR. 1 IVRR F RI CCR PMP II IMIR 32 1 F F IG IGH W PRP IC H W R IGH F I PRR IICR F GI F H FIR CI F IR G IGH IRM IRC IGH WRIG YM IG GR WRIG HR F F V HR PI IMR RIM F G YW MP XI IGH W V IGH W RIGH PI H W RIGH I PRR IICR RIGH GI F H CHIP CR RIGH IR RI & GI IRM IGH CI F & MKIG IG CHIM IG GR PII IICR RIGH F V HR CPI' R & IP IICR RR YM RIGH G RIGH GRR 2 F F GRR RCGII IGH W RIGH IG IGH W IC IGH W IG GR WRIG H R F FW 225 FR RIGH I MP IICR RIGH IC V FHR CI MP P C IGH RIGH IR WRIG CIR IICR WIHI WIPR VCM MPR YM. 2 IVRR F M PRP IC FP MR FP & IICR F IGIR PWR F RR F F PRR WRIG F X F QIY WRIG RFR F Y F PMP F FIRW VV F F QIY 3 F M PRP IC RIGH M PRP IC PRPR GVRR RIGH IGIR PWR RIGH RR RIGH FIRW VV RIGH Y F PMP RIGH X F QIY WRIG RFR RIGH F PRR WRIG F CRF RIGH F QIY 4 F 4-2 eveloped for raining Purposes King ir 200 ctober 1998

3 lectrical ystem RIGH GRR FRM. 2 F 40 G GR M PI QIPM C PWR IG GR MR R YMIC RK V WR PWR F VPRR WR PWR IR CIIR CCH CPI' WIHI I-IC RIGH RI H C JCK IG GR MR VIIC VIIC. 2 PWR RY VIIC. 3 FRM. 1 F VIIC WICH VIIC FF MR VIIC. 3 PWR RY VIIC. 1 VIIC. 1 PWR RY 20 PI' WIHI I-IC F RI H CR WR C PWR CRR IMIR F GRR King ir 200 eveloped for raining Purposes 4-3 ctober 1998

4 C imuflite C lectrical ystem King ir 200 RIGH RR G H RIGH G RVR CRR PRCI RY RY CHRG R R V MMRY (P) RY R (P.) RY & CCK & X PWR RIGH Y F PMP 2 F Y F PMP 2 HRH F FIRW HFF VV RIGH FIRW HFF VV F FIR X RIGH FIR X F RR G RVR CRR PRCI F G X PWR 1 H R Y H + - XR PWR PG-GG R RY W H C RIGH R RY X PWR RY RY RY + VR V PR + X PWR CCI F R RY C II IMIR 32 M I R Y II IMIR 32 I I F IG IGH PRP MIC H WICH R IGH WICH VIIC MR F I PRR F IC V C F G VRH (P.) PRP YCHRPHR FIGH & GYR IRM IGH VRH I P IGH F IR WRIG CIR PWR PMIC RFC IC MIC XYG F IR CR IMR (P.) PICH RIM F G 1 F F PI H C IGH WICH I F IGH WICH F F FW F I PRR WRIG (P.) F GI F C H FIR CI F CHIP CR IRM IIRC IGH WRIG YM IG GR WRIG HR F F V HR RK IC (PI) YW MPR PI' R & IP. 1 IVRR F I MPRR CI PR RIGH GRR RIGH IG IGH WICH V IGH RCGII IGH RIGH PI H RIGH F FW IICR RIGH I PR WRIG (P.) RIGH GI F H RIGH FIR CI RIGH CHIP CR CI RIG IGH VRH, P C RIGH IR WRIG CIR IICR WIHI WIPR CI MP. 2 IVRR FRIHIG MR 2 F F GRR XI IGH WICH IC IGH IG GR WRIG H RIGH I PR IICR RIGH I MP MPRR R IC V C RIGH G VRH (P.) FHR VIIC & GI IRM CPI' R & IP FRC MK, F, CI IG GR PII I RIGH F V H CI PRR (P.) RIGH IR RR RIGH GRR CIGR IGHR F M PRP IC FP MR FP & IICR F IGIR PWR F RR F F PRR WRIG F F QIY F X F QIY WRIG RFR F Y F PMP F FIRW VV 3 F M PRP IC RIGH M PRP IC PRPR GVRR RIGH IGIR PWR RIGH RR RIGH FIRW VV RIGH Y F PMP RIGH X F QIY WRIG RFR RIGH F QIY RIGH F PRR WRIG F CRF 4 F , Q CIRCI RKR RPC F , PRIR 4-4 eveloped for raining Purposes King ir 200 ctober 1998

5 lectrical ystem RIGH GRR FRM. 2 F 40 G GR M PI QIPM C PWR IG GR MR R YMIC RK V WR PWR F VPRR WR PWR IR CIIR CCH CPI' WIHI I-IC RIGH RI H C JCK IG GR MR VIIC VIIC. 2 PWR RY FRM. 1 F VIIC. 3 VIIC. 3 PWR RY VIIC WICH VIIC MR FF VIIC. 1 VIIC. 1 PWR RY PI' WIHI I-IC F RI H CR WR C PWR F GRR King ir 200 eveloped for raining Purposes 4-5 ctober 1998

6 C imuflite 4-6 eveloped for raining Purposes King ir 200 ctober 1998

7 lectrical ystem lectrical ystem C ystem C electrical sources include: a 24V, 34 amp-hour nickel-cadmium battery two 2 30V C starter/generators an external C power system. hese power sources supply the dual-fed bus system that distributes power to the aircraft through circuit breakers: attery he battery powers starting and emergency operation of essential equipment powered from the Hot attery bus. With the switch in, power flows from the battery through the battery relay to the Main attery bus. he Main attery bus then feeds the Isolation bus that, in turn, provides power to the eft and Right Generator buses. nce the Generator buses are powered, the four ual-fed buses are powered. he Main attery bus also supplies two starter circuits controlled by the engine starter switches and starter relays. For nicad batteries, a battery charge current detector continuously monitors battery charging rate. If charging rate exceeds 7 amps for six seconds or more, the monitoring system illuminates the RY CHRG annunciator and triggers the flashing MR CI annunciators. fter a battery engine start, the RY CHRG annunciator normally illuminates after the operating engine generator is turned on. King ir 200 eveloped for raining Purposes 4-7 ctober 1998

8 C imuflite Generators he generators function as starters during engine starts. nce an engine is running, the generators provide C power to the aircraft. G 1 and G 2 switches control the generators. he MR WICH gang bar turns off the battery and generator switches simultaneously. Reverse-current protection prevents the generators from absorbing power from the Generator buses if the generators are not operating, or if generator voltage is less than bus voltage. Voltage Regulation n aircraft -2 to 88, a voltage regulation system consists of transistorized regulators, overvoltage relays, paralleling relays, and reverse current relays. hese components provide: generator load paralleling reverse current cutout voltage regulation to ±0.25V C overvoltage protection under voltage protection starter/generator priority he voltage regulators (one for each generator) maintain a constant level voltage output. he paralleling circuit functions when both generators are on-line. he circuit depresses the voltage of the high- output generator and increases that of the low-output generator until both are equal. If generator output exceeds 32 to 34V, the overvoltage relay trips to take the generator off-line. ctuation of the overvoltage relay also removes voltage from the W terminal of the reversecurrent relay so it opens and removes the generator from the bus. If the overvoltage condition is the result of a voltage regulator malfunction, the overvoltage relays stops the condition. If generator output voltage drops below bus voltage, the reverse current relay isolates the generator from the bus to protect the generator. 4-8 eveloped for raining Purposes King ir 200 eptember 2002

9 lectrical ystem n aircraft -89 and subsequent; -1 and subsequent, generator control units (GCs) and line contactor relays regulate voltage to provide: voltage regulation line contactor relay control generator load paralleling differential voltage and reverse current sensing and control overvoltage and overexcitation control start/generator priority. nce the engine is running, the GC uses residual voltage to build generator voltage to the point where it can actually regulate output voltage. nce generator output reaches this point, the GC increases generator output until it reaches ±0.25V C. t this point, generator output can be connected to the associated Generator bus. fter the G switch is in, the GC compares bus voltage to generator output voltage. When these voltages are nearly the same, the GC closes the line contactor relay. Generator output is then connected to the respective Generator bus. With both generators on-line, the GC equalizer relay energizes to enable load paralleling circuits. oth GCs compare their respective generator s output voltage to the opposite generator. he GCs then adjusts generator output voltage so both generators equally share the load within approximately 10%. If a generator begins drawing current from the electrical system (i.e., reverse current condition), the GC opens the line contactor relay to remove the generator from its Generator bus. nce the reverse current condition clears, the GC automatically resets and the generator comes back on-line. n overvoltage condition can occur when generator output voltage increases to 32V C. If this occurs, the GC will deenergize the generator and trip the line contactor. nce the overvoltage condition clears, the generator must be manually brought back on-line. King ir 200 eveloped for raining Purposes 4-9 eptember 2002

10 C imuflite xternal Power n appropriately rated ground power unit (GP) can supply the aircraft electrical system through an external power receptacle on the right wing. he ground power unit (GP) should be capable of providing a continuous load of 300 at 24 to 30V C and 1,000 for 0.1 seconds during engine start. se of an inadequate GP will cause a voltage drop below the start relay s drop-out voltage. his may result in relay chatter and welded contacts. imilarly, a GP that provides more than 3 continuous load will damage the external power relay and airplane power cables. Connecting a GP illuminates the X PWR annunciator. With external power connected, the generators will not come on-line. CI: he output setting must not exceed 1,000 on external power sources with a higher current-carrying capability. ny current in excess of 1,000 may overtorque the starter-generator driveshaft or produce heat sufficient to shorten starter-generator life eveloped for raining Purposes King ir 200 eptember 2002

11 lectrical ystem C Power istribution he C power distribution system includes: Hot attery bus Main attery bus Isolation bus eft and Right Generator buses os. 1, 2, 3, and 4 ual-fed buses os. 1 and 2 vionics buses optional o. 3 vionics bus. he battery directly powers the Hot attery bus. his bus is unswitched (i.e., always powered) and supplies power to items that may be operating with the battery switch FF. With the battery switch, the closed battery contacts connect the battery to the Main attery bus. he primary load of the Main attery bus is the left and right starter/generators during engine start. It also powers the Isolation bus. With a GP connected to the aircraft, the Main attery bus is powered through the closed external power relay. he Isolation bus serves as a connection between the eft and Right Generator buses. High amperage current limiters between the Isolation bus and the Generator buses isolate the battery from a Generator bus fault. ach of the four ual-fed buses receive power simultaneously from the eft and Right Generator buses. hese buses are always powered from a combination of three sources. ypically, these sources are both generators or a generator and/or battery. he left and right generators power, respectively, the os. 1 and 2 C vionics buses. he VIIC MR switch and avionics master power relays control this power. With the switch in, the relays de-energize to the normally closed position to ensure that if the switch fails, the relays provide continued power to the avionics equipment. King ir 200 eveloped for raining Purposes 4-11 eptember 2002

12 C imuflite C lectrical ystem RIGH G KIG IR V YW R (113 FR) RIGH GI RQMR C RIGH GI F FW (PRIR 225). 2 IV 115V C 26V C F GI RQMR F GI F FW (PRIR 225) FRM. 2 -F. 2 IV IV RY IV C WICH C VIIC RR V C KIG IR 200 YW R RIGH GI RQMR F GI RQMR IV FRM. 1 -F IV RY 10 IV C RY M VRII CIR KIG IR 200 KIG IR V C IVRR I IV. 1 IV 26 V C JCK C V F G V/FRQCY MR , PRIR FRM. 2 -F 4-12 eveloped for raining Purposes King ir 200 ctober 1998

13 lectrical ystem C Power wo 250V or 750V, 400 Hz static inverters supply 115V and 26V C power. ach inverter operates on 28V C. he eft Generator bus powers the o. 1 inverter while the Right Generator bus powers the o. 2 inverter. Placing the IVRR switch in the o. 1 or o. 2 position energizes the respective inverter s control relay. he relay closes so that Generator bus powers the inverter. he IVRR switch also controls the inverter select relay to connect the 26V C buses to the selected inverter and 115V C to the voltage/frequency meter and inverter fail relay. H IVRR or I IV annunciator illuminates when 115V is lost at the annunciator relay. M PC-250 PC V 750V 115V ±3% 115V +5% or -7% 400 Hz ±1% 400 Hz ±1% King ir 200 eveloped for raining Purposes 4-13 eptember 2002

14 C imuflite lectrical ystems C lectrical ystem Power ource istribution Control Monitor Protection attery tarter/generators (2) 2 () xternal power unit Hot attery bus attery relay Main attery bus tart Relays (left and right) Isolation bus Generator buses (left and right) ual-fed buses (o. 1 through 4) vionic buses (o. 1, o. 2, and optional o. 3) witches IGII GI R (/R) wo-position G (1/2) -088 and prior hree-position G (1/2) -089 and sub. C volt/loadmeter (/R) G annunciators (/R) X PWR annunciator attery Charge annunciator Voltage regulator Generator paralleling Reverse current sensing and control ver-voltage protection ver-excitation protection nder-excitation protection GP Reverse polarity sensing Generator buses Isolation limiters (32) Current limiters Circuit breakers ual-fed buses Current limiters () Circuit breakers () iodes (70) Hot attery bus Fuses or circuit breakers 4-14 eveloped for raining Purposes King ir 200 eptember 2002

15 lectrical ystem C lectrical ystem Power ource istribution Control Monitor Protection Inverters (250V 750V) Generator buses (/R) Inverters os 1 and 2 26V C bus 115V C avionics IVRR switch IVRR annunciator Volt/Frequency meter C to inverter: current limiter Inverter output: fuses and circuit breakers King ir 200 eveloped for raining Purposes 4-15 eptember 2002

16 C imuflite 4-16 eveloped for raining Purposes King ir 200 ctober 1998

Cessna Citation XLS - Electrical

Cessna Citation XLS - Electrical GENERAL Electrical power for the Citation XLS comes primarily from DC sources originating with the starter/ generators, the Auxiliary Power Unit (APU) or the battery. A receptacle below the left engine