Manitowoc Published 10-01-2012, Control # 045-08 3-15
777 SERVICE MANUAL ELECTRIC SYSTEM
3
Computer 12 VDC NC E-31 —
Computer Ground NC E-32 —
Crane Mode Confirm 89T2 B-10 DI-10 12 VDC Nominal I/O 1 J6-16
Crane Mode Select 89S2 B-09 DI-9 12 VDC Nominal I/O 1 J6-15
Display - Black (Common) TX2-0 D-20 — CPU J4-07-08
Display - White (Input) TX2 D-19 — Approximately 2.5 VDC CPU J4-05
Display Scroll Down 89K B-33 DI-33 12 VDC Nominal I/O 3 J10-11
Display Scroll Up 89J B-26 DI-26 12 VDC Nominal I/O 2 J8-18
Engine Coolant Temperature 89U3 B-19 DI-19 0 VDC below 210°F; 12 VDC above 210°F I/O 2 J8-11
Engine Oil Pressure 89T3 B-18 DI-18 8 PSI (switch on) I/O 2 J8-10
Engine RPM Transducer 24 D-07 MP1 Above 9.0 Volts AC I/O 1 J6-05
Engine Throttle Interface 68KB C-20 DO-10 12 VDC Nominal I/O 1 J6-39-40
Foot Throttle 68KA A-02 AI-35 0.101 to 10.09 Volts CPU J3-64
Front Drum Band Brake 80E C-07 DO-1 12 VDC Nominal I/O 1 J6-21-22
Front Drum Disc Brake Park Switch 89Y3 D-08 DI-37 12 VDC Nominal (when brake is applied) I/O 3 J10-15
Front Drum Disc Brake Solenoid 80Q C-18 DO-8 12 VDC Nominal I/O 1 J6-35-36
Front Drum Flange Direction Encoder
Channel B1
80MB D-02 ECB1 7.5 VDC Plus or 0 VDC Not Moving; 3.5 VDC Moving I/O 1 J6-02
Front Drum Flange Speed Encoder
Channel A1
80MA D-01 ECA1 7.5 VDC Plus or 0 VDC Not Moving; 3.5 VDC Moving I/O 1 J6-01
Front Drum Free Fall Enable 89M B-23 DI-23 12 VDC Nominal I/O 2 J8-15
Front Drum Free Fall Light 80DS C-35 DO-19 12 VDC Nominal I/O 2 J8-37-38
Front Drum Handle (Handle 1) 80P A-03 AI-1
0 VDC Neutral; 5 to 1.4 VDC Lower;
5 to 8.6 VDC Raise
I/O 1 J5-50
Front Drum Motor Control Right and
Left Side
80S D-24 AO-1
0 VDC Up to 1/3 Handle Movement;
0.96 to 2.19 VDC 1/3 to Full Handle Movement
I/O 1 J6-06
Front Drum Maximum Bail Limit 89V B-02 DI-2 12 VDC Nominal I/O 1 J6-08
Front Drum Minimum Bail Limit 89T B-03 DI-3 12 VDC Nominal I/O 1 J6-09
Front Drum Pump Control (Servo Driver 1) 80A C-05 AO-S1
0 to 2.8 ± 10% (110 Ma ± 10%) VDC Up;
0 to -2.8 ± 10% (-110 Ma ± 10%) VDC Down
I/O 1 J6-41
Front Drum Pawl In 89L3 B-29 DI-29 12 VDC Nominal I/O 3 J10-07
Front Drum Rotation Indicator 80N D-27 DO-22 12 VDC Nominal I/O 3 J10-23-24
Front Drum System Pressure (Pump 0A) 80QS A-22 AI-19 1 VDC at No Pressure; 1.2 VDC at 300 PSI CPU J3-53
Hand Throttle 68KK A-17 AI-14 12 VDC Nominal I/O 2 J7-60
High Speed Travel Switch 89L1 B-35 DI-35 12 VDC Nominal I/O 3 J10-13
Hydraulic Filter Alarm 1 89D4 E-13 DI-45 12 VDC Nominal (when filter bypassing) I/O 4 J12-09
Hydraulic Filter Alarm 2 89E4 E-14 DI-46 12 VDC Nominal (when filter bypassing) I/O 4 J12-10
Hydraulic Filter Alarm 3 89F4 E-15 DI-47 12 VDC Nominal (when filter bypassing) I/O 4 J12-11
Hydraulic Filter Alarm 4 89G4 E-16 DI-48 12 VDC Nominal (when filter bypassing) I/O 4 J12-12
Hydraulic Filter Alarm 5 89H4 E-17 DI-49 12 VDC Nominal (when strainer is clean) I/O 4 J12-13
Hydraulic Filter Alarm 6 89Z4 E-24 DI-56 12 VDC Nominal (when filter is bypassing) I/O 4 J12-20
Hydraulic Fluid Level 89R3 B-16 DI-16 0 VDC Low Level; 12 VDC High Level I/O 2 J8-08
Hydraulic Fluid Temperature 89S3 B-17 DI-17 0 VDC above 180°F; 12 VDC below 180°F I/O 2 J8-09
Left Front Drum Clutch Free Fall 80FLS C-33 DO-17 12 VDC Nominal I/O 2 J8-33-34
Left Front Drum Clutch Switch 89ZD B-20 DI-20 12 VDC Nominal I/O 2 J8-12
Left Front Drum Encoder Channel A 80MALS E-25 ECA7 7.5 VDC Plus or 0 VDC Not Moving; 3.5 VDC Moving I/O 4 J12-01
Left Front Drum Encoder Channel B 80MBLS E-26 ECB7 7.5 VDC Plus or 0 VDC Not Moving; 3.5 VDC Moving I/O 4 J12-02
Left Rear Drum Clutch Switch 89ZH B-31 DI-31 12 VDC Nominal I/O 3 J10-09
Left Rear Drum Encoder Channel A 81MALS E-27 ECA8 7.5 VDC Plus or 0 VDC Not Moving; 3.5 VDC Moving I/O 4 J12-03
Description Wire # Pin # I/O #
Test Voltage
(DC unless otherwise specified)
Connection
(Signal Type)
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