PISTON AS 7C3776 - Caterpillar

The instrument panel is the control station for the engine. The instrument panel has the following controls on the front of the panel: Marine Power Display (MPD), Engine Control Switch (ECS), emergency stop switch and indicator lamps. The instrument panel contains the following controls on the inside of the panel: override switches, control relays and diodes.Instrument Panel
Illustration 1 g01000239
Instrument panel
(1) Marine Power Display (MPD)
(2) Overspeed indicator
(3) Emergency stop lamp
(4) "Crank override" switch
(5) "Prelube override" switch
(6) "Protection override" switch
(7) "Low idle" switch
(8) Diodes D1 to D8
(9) Engine control switch (ECS)
(10) Local emergency stop switch
(11) Alarm (horn)
(12) "STE" relay
(13) "Reset 1" relay
(14) "Run 1" relay
(15) "Stop 1" relay
(16) "STPE" relay
(17) "Reset 2" relay
(18) "Run 2" relay
(19) "Stop 2" relay
(20) "ECSIR" relay
(21) "HRN" relay
(22) "SN" relay
(23) Redundant speed switch Power Distribution Panel
The power distribution panel distributes power to the various systems on the engine. The power distribution panel has two external connections for the battery. The power distribution panel has multiple breakers that are mounted externally. The power distribution panel contains the following controls on the inside of the panel: control relays, circuit breakers, diodes, control switches and timer.
Illustration 2 g00995435
Power distribution panel
(1) 20 Amp circuit breaker
(2) 20 Amp circuit breaker
(3) 40 Amp circuit breaker
(4) 20 Amp circuit breaker
(5) 70 Amp circuit breaker
(6) "SD Notify" relay
(7) Starter and alternator circuit breaker
(8) "Marine Power Display (MPD)" circuit breaker
(9) Circuit breaker for the prelube and air shutoff circuits
(10) Circuit breaker for the secondary ECM
(11) Air shutoff timer
(12) Circuit breaker for the primary ECM
(13) Air shutoff switch (ASOS)
(14) Positive battery terminal
(15) Negative battery terminal
(16) General alarm relay
(17) Starting motor magnetic switch 2
(18) Starting motor magnetic switch 1
(19) "R4A" relay
(20) "R3A" relay
(21) "R2A" relay
(22) "R1" relay
(23) "PPR1" switch
(24) "R4" relay
(25) "R3" relay
(26) "R2" relay
(27) "PPR2" relay Note: Circuit breaker (10) and relay (26) are not used on marine auxiliary engines.