Dispositivos de Proteção Do Motor

Application
Engineering
Bulletin
Subject
Engine Protection Device
Requirements for
G-Drive Engines
Date October, 1995 Page 1 of 3 AEB Number 152.02
This AEB has been compiled to clarify Cummins requirements regarding engine protection (safety) devices for the
current G-Drive product range and to introduce the new mandatory requirement for coolant level/pressure device for
KV engines.
Key to abbreviations given in this bulletin:-
Abbreviation Description Directive
LOP Low Oil Pressure Mandatory

HCT High Coolant Temperature Mandatory
LCL Low Coolant Level Mandatory for KV
LCL Low Coolant Level Preferred, B thru V28
LCT Low Coolant Temperature Preferred
PLOP Pre-Low Oil Pressure Preferred
PHCT Pre-High Coolant Temperature Preferred
LCP Low Coolant Pressure Optional with /alternative to LCL (Note3)
HOT High Oil Temperature Preferred
OS Overspeed Mandatory
Notes:-
1. Active Coolant Pressurization will be introduced on “KV” G-Drive engines during 1995. A separate bulletin will
be issued to cover this subject and its directives on associated safety devices.
2. The recommended minimum engine block coolant temperature for sustained operation is 160 ×F (71×C).
Engines operated for prolonged periods (over 0.5 hours) with engine block coolant temperatures below the
recommended value may suffer reduced durability to water pumps and cylinder liners.
3. Low Coolant Pressure is considered to be either an optional shutdown device which can be used in conjunction
with a Low Coolant Level alarm or suitable as an alternative shutdown device to a Low Coolant Level shutdown
device.
Device Activation / Deactivation Parameters
Tables 1a & 1b on Page 2, detail the recommended settings of the engine protection devices and optional
device settings where appropriate.
“Activates” & “Deactivates” relate to the action of the engine protection device not the reaction which the device
triggers.
For example;
The Low Oil Pressure switch “activates” upon reaching 35PSI (+/-2PSI) and positions the contacts of the
switch so that an engine shutdown is not applied. As oil pressure falls to 25PSI (+/-2PSI) the switch
“deactivates” and positions the contacts of the switch so that an engine shutdown is applied.
Cummins Engine Company, Inc., Columbus, Indiana 47201 Form 5745-0281

AEB 152.02
Page 2 of 3
Mandatory , Preferred & Optional Requirements
Table 2a on Page 3, details the mandatory requirements of engine protection for all G-Drive applications.
Table 2b on Page 3, details the preferred and optional requirements for all G-Drive applications.
Device Activation / Deactivation Parameters
Table 1a English Units
Cummins Recommendation Optional

Device Activates Deactivates Activates Deactivates Engine protection
LOP*** 35PSI 25PSI 16PSI 12PSI Shutdown
HCT 223°F 218°F CustomerPreferred Shutdown
LCL Loss of coolant Loss of coolant Shutdown/Alarm
LCT ** 95°F 90°F - 160°F Alarm
PLOP 45PSI 30PSI CustomerPreferred Alarm
PHCT 215°F 210°F CustomerPreferred Alarm
LCP— 32PSI 22PSI 14PSI 6PSI Shutdown/Alarm
HOT 265×F 260×F CustomerPreferred Shutdown
OS +7.5% RATED SPEED CustomerPreferred Shutdown
Table 1b Metric units
Cummins Recommendation Optional

Device Activates Deactivates Activates Deactivates Engine protection
LOP*** 240kPa 172kPa 110kPa 83kPa Shutdown
HCT 106°C 103°C Customer Preferred Shutdown
LCL Loss of coolant Loss of coolant Shutdown/Alarm
LCT ** 35°C 32°C - 71°C Alarm
PLOP 310kPa 207kPa Customer Preferred Alarm
PHCT 102°C 99°C Customer Preferred Alarm
LCP— 220kPa 152kPa 96kPa 40kPa Shutdown/Alarm
HOT 130×C 127×C Customer Preferred Shutdown
OS +7.5% RATED SPEED Customer Preferred Shutdown
Notes:-·
• The tolerance on the above devices is +/- 14 kPa (+/- 2 PSI) and +/- 2×C (+/- 3×F)·
• Standby & Prime / Continuous operation HCT switches are based on a 220×F (104×C) maximum design
Top Tank Temperature.·
• ***The “L” engine family utilize the “Optional” 12PSI Low Oil Pressure switch setting rather than the 25PSI
setting which is used by all other engine families at this time. ·
• Engines cannot be operated at “Idle” when using the 25PSI switch.·
• ** It should be noted that the Low Coolant Temperature switch parameters are designed for indicating to the
user that the engine coolant heater system is not performing and the non-started engine is not being
warmed for Standby application. It is not designed to indicate that the coolant temperature of a running
engine is low.·
• The Low Coolant Temperature switch parameters given in the Optional column would indicate that the
coolant temperature of a running engine is low, i.e.; below 160×F (71×C). Refer to Note#2, Page 1.·—
• — In general, steady state coolant pressure should not fall below 25PSI. However, variation in water pump
design, cooling system design and variations in engine performance during transient load application may
require the use of an “Activation” setting different to that which is shown.
AEB 152.02
Page 3 of 3
Mandatory , Preferred & Optional Requirements
Table 2a Mandatory Devices
Engine LOP HCT LCL

Family Part No. Ref: Option Part No. Ref: Option Part No. Ref: Option
B 3255283 SD 9022 3056353 SD 8024 - -
C 3255283 SD 9022 3056353 SD 9021 - -
L 3056344 SD 8027 3056353 SD 8024 - -
N 3255283 EC 8360 3056353 EC 8267 - -
K19 3255283 EC 8356 3056353 EC 8276 - -
V28 3255283 EC 8356 3056353 EC 8276 - -
KV 3255283 EC 8356 3056353 EC 8276 3001543 EC 8243
Table 2b Preferred & Optional Devices
PREFERRED OPTIONAL
Engine LCT LCL PLOP PHCT HOT LCP

Family
Ref: Ref: Ref: Ref: Ref: Ref:
Part No. Part No. Part No. Part No. Part No. Part No.
Option Option Option Option Option Option
B TBA - TBA - TBA - TBA - TBA - - -
C TBA - TBA - TBA - TBA - TBA - 3062867 SD 9025
L 3056350 SD 8027 3001543 SD 8025 3056345* SD 8027 3056355 SD 8028 TBA - - -
N 3056350 EC 8278 3001543 EC 8273 3056345* EC 8278 3056355 EC 8278 TBA - - -
K19 3056350 EC 8278 3001543 EC 8273 3056345* EC 8278 3056355 EC 8278 3056354 - - -
V28 3056350 EC 8278 3001543 EC 8273 3056345* EC 8278 3056355 EC 8278 TBA - - -
KV 3056350 EC 8278 REF: MANDATORY 3056345* EC 8278 3056355 EC 8278 3056354 - - -
• Part.No.’s and Option No.’s are given for reference. There is no requirement that these devices should
be purchased from Cummins.
• TBA denotes that preferred Part.No.’s can be provided upon request, by the local Application Engineering
representative.
• * This PLOP switch is used when a 12PSI LOP switch is used. No PLOP switch is currently released for
use with 25PSI LOP switch.
• All part numbers shown, except the LCL sensor, are 3 pin, molded “metri-pak” connector type, voltage
rated between 12 to 32 Volt and single element. The LCL is a 4 blade terminal sensor, 12 to 32 volt rated.
• For devices rated above 32Volt and adapter harnesses for “metri-pak” connectors, consult your G-Drive
Sales Handbook or local Application Engineering representative.
Mounting Details
Description Preferred Location Typical Device Thread Size
Low Oil Pressure Engine block or Filter head 1/8” NPT

High Coolant Temperature Thermostat housing 1/2” NPT
Low Coolant Level Heat Exchanger 1/4” NPT
Low Coolant Temperature Thermostat housing 1/2” NPT
Pre-Low Oil Pressure Engine block or Filter head 1/8” NPT
Pre-High Coolant Temperature Thermostat housing 1/2” NPT
Low Coolant Pressure Engine block / water pump outlet 1/8” NPT
High Oil Temperature Engine oil pan 1/2” NPT
Overspeed Remote engine panel Not Applicable
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Application

Date October, 1995 Page 1 of 3 AEB Number 152.02

Key to abbreviations given in this bulletin:-

Abbreviation Description Directive

LOP Low Oil Pressure Mandatory

Device Activation / Deactivation Parameters

Cummins Engine Company, Inc., Columbus, Indiana 47201 Form 5745-0281

Device Activation / Deactivation Parameters

Table 1a English Units

Cummins Recommendation Optional

Table 1b Metric units

Cummins Recommendation Optional

Table 2a Mandatory Devices

Engine LOP HCT LCL

Table 2b Preferred & Optional Devices

Engine LCT LCL PLOP PHCT HOT LCP

Low Oil Pressure Engine block or Filter head 1/8” NPT

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