- Engine
- 3516C (S/N: SKC1-UP; SCJ1-UP; SCK1-UP; SFK1-UP)
- C175-16 (S/N: WYC1-UP)
Introduction
Do not perform any procedure in this Special Instruction until you have read the information and you understand the information. Do not order any parts until you have read the information and understand the information.
For the C175-16 & 3516C Tier 4I gensets, the engine ECM pin J1-22 is now used for "Inducement Override". Once "Inducement Override" has been enabled through Cat ET. This pin out was formerly labeled as "Driven Equipment Shutdown" (which was used for the Ether option in the EMCP panels). Once the Inducement Override feature is enabled in Cat ET and once the engine ECM pin J1-22 is taken to digital reference the override will become active. The below diagrams are examples of wiring and depending on the vintage of harness, type of EMCP and optional attachments installed on the EMCP panel. There will be variations in how the Inducement Override circuit is mounted and wired.
There are two switches that can be used for the Inducement Override. The 301-2981 Toggle Switch is designed and uses a guard to prevent accidental activation. The 368-4538 Rocker Switch is a design contains a locking tab to prevent accidental activation. Depending on which switch is chosen, below are the parts needed to complete the installation of the Inducement Override.
Required Parts
| Required Parts Toggle Switch | ||
| Qty | Part Number | Description |
| 1 | Toggle Switch | |
| 2 | DT Crimping Tool (Generator Mounted EMCP) |
Connectors Socket |
| 1 | Connector Socket | |
| 1 | DT Crimping Tool (Wall Mounted EMCP) |
Connector Socket |
| 1 | Switch Guard | |
| 1 | Connector Plug As | |
| 1 | Film | |
| 1 | 18–AWG Wire | 18–AWG Wire |
| Required Parts Rocker Switch | ||
| Qty | Part Number | Description |
| 1 | Rocker Switch | |
| 1 | Connecting Plug Kit | |
| 2 | DT Crimping Tool (Generator Mounted EMCP) |
Connector Socket |
| 1 | Connector Socket | |
| 1 | DT Crimping Tool (Wall Mounted EMCP) |
Connector Plug As |
| 1 | Film | |
| 1 | 18–AWG Wire | 18–AWG Wire |
Wiring for Toggle Switch
| |
| Illustration 1 | g06007023 |
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Toggle Switch Installation and Wiring Instructions for Generator Mounted EMCP & Wall Mounted EMCP Panels. | |
Note: For C175 engines wire1is already present in the existing harness to the generator interface connection for Generator-mounted EMCP Panels & the harness for the Remote Mounted EMCP Panel, proceed to step #2.
- Wire 1: Cut an 18 AWG wire and crimp a 9X-3402 Connector Socket on each end or a 180-9340 Connector Socket on one end depending on the EMCP panel used. Insert one end of the wire with 9X-3402 Connector Socket into the engine ECM connector J1 pin 22. The other end will run along the harness up to the generator control box and insert pin 9 at the connector interface into the control box (generator-mounted EMCP). The new wire will need to be run externally and secured to the existing harness using tie straps or some other means.
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Illustration 2 g06007030 Reference image above for location of the generator interface connection: - For Wall Mounted EMCP the new wire will need to run along the interconnect harness to the remote mounted EMCP Panel and the wire end with the 180-9340 Connector Socket will be inserted into the 1U-9458 Connector military style connector that connects to the EMCP panel.
Note: The wire with the 180-9340 Connector Socket will need to be inserted into the connector in one of the open holes that is not being used. Pin 51 is suggested as this pin location is for the optional Ether wire.
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Illustration 3 g06007191 Wall Mount Cabinet
(1) Wall Mounted Cabinet
(2) Engine interface connector ET-C5 connects to Connector L-C1 - Depending on optional attachments that were added to the EMCP panel, there will be an existing hole that can be used to mount toggle switch. The 376-3101 Blind Grommet can be removed and the 301-2981 Toggle Switch can be installed. The toggle switch can mount directly into one of the non-used holes in the EMCP panel. Install the toggle switch and 3E-5169 Switch Guard together to prevent both pieces from rotating.
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Illustration 4 g06007398 Switch mounting location options - Wires 2 and 3: There will be an existing harness already installed inside the generator-mounted EMCP panel. The wiring connector will be labeled as "ether". A 155-2267 Connector Plug As will already be in this harness (unused due to ether not being installed) located near the cutout for the ether toggle location. Remove the wire in A (R774-PH1 GY-18) and relocate to pin C. The existing wire in pin B will need to be wired as is. Plug this connector into the toggle switch.
For the wall-mounted EMCP panel wires 2 and 3 will need to be run and wired into the 155-2267 Connector Plug As.
- Install a 490-6464 film next to the face of the EMCP panel next to the toggle switch or rocker switch.
Wiring for Rocker Switch
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| Illustration 5 | g06007440 |
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Rocker Switch Schematic | |
Note: For C175 engines wire1is already present in the existing harness to the generator interface connection for Generator-mounted EMCP Panels & the harness for the Remote Mounted EMCP Panel, proceed to step #2.
- Wire 1: Cut an 18 AWG wire and crimp a 9X-3402 Connector Socket on each end or a 180-9340 Connector Socket on one end depending on the EMCP panel used. Insert one end of the wire with 9X-3402 Connector Socket into the engine ECM connector J1, pin 22, and the other end will run along the harness up to the control box and insert into pin 9 at the connector interface into the generator control box. The new wire will need to be run externally and secured to the existing harness using tie straps or some other means.
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Illustration 6 g06007450 Generator Interface Connection - For Wall Mounted EMCP the new wire will need to run along the interconnect harness to the remote mounted EMCP Panel. The wire end with the 180-9340 Connector Socket will be inserted into the 1U-9458 Connector military style connector that connects to the EMCP panel.
Note: The wire with the 180-9340 Connector Socket will need to be inserted into the connector in one of the open holes that is not being used. Pin 51 is suggested as this pin location is for the optional Ether wire.
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Illustration 7 g06007478 Wall Mounted Cabinet
(3) Wall-mounted Cabinet
(4) Engine interface connector ET-C5 connects to Connector L-C1 - Depending on optional attachments that were added to the EMCP panel, there will be an existing area that can be used to mount rocker switch. The EMCP panel will need to be cutout to accept the rocker switch.
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Illustration 8 g06007488 Switch Mounting Location Options Show/hide table
Illustration 9 g06007568 Panel Opening (Mount Vertical) - Once the rocker switch location has been cutout, then mount the rocker switch to the panel.
- Wires 4 and 5: There will be an existing harness already installed inside the generator-mounted EMCP panel. The wiring connector will be labeled as "ether". A 155-2267 Connector Plug As will already be in this harness (unused due to ether not being installed) located near the cutout for the ether toggle location. Remove the connector from the wires (Note: the wires can be cut from the connector as the terminals will also not be used.) Crimp the wire assemblies from the 245-7434 Connecting Plug Kit onto the wires that previously went to the 155-2267 Connector Plug As. Insert wire 998-EP45 (5) into pin 5 of the new rocker connector and insert wire R774-EP126 (4) into pin 6. Plug this connector into the rocker switch.
For the wall-mounted EMCP panel wires 4 and 5 will need to be run and wired into the 155-2267 Connector Plug As.
- Install a 490-6464 Film next to the face of the EMCP panel next to the toggle switch or rocker switch.
Testing the Circuit Prior to Enabling
Note: Complete all wiring and test circuit performance prior to Enabling the Inducement Override feature in Cat ET.
- Using a voltage measuring device, measure voltage at the Engine ECM, pin J1-22 . With the newly added Toggle or Rocker Switch in the OFF position, verify that there is 12 VDC on pin J1-22 .
If there is not 12 VDC present at pin J1-22, then verify the wiring circuit, ensure that the ECM is powered up and there is 12 VDC at the Keyswitch pin.
- Using a voltage measuring device, measure voltage at the Engine ECM, pin J1-22 . With the newly added Toggle or Rocker Switch in the ON position, verify that there is 0 V DC on the pin J1-22 .
- Using a voltage measuring device, verify that the pin J1-22 changes voltage between 0 V DC and 12 VDC when the Toggle Switch or Rocker Switch changes positions.
- Return the Toggle Switch or Rocker Switch to the "OFF" position after testing is complete.
Note: Enabling the Inducement Override Feature in Cat ET, while the Toggle Switch or Rocker Switch is in the ON position, will Activate the override feature and require an Override Usage Report to be filed.
Reference Section
REHS9572, "Inducement Emergency Override for Caterpillar® Engines Equipped With Selective Catalytic Reduction Systems"
, SEBU8546, Operator and Maintenance Manual, 3516C Generator Sets
, SEBU8596, Operator and Maintenance Manual, C175-16 Generator Sets