WHEEL & TIRE GP 2011876 - Caterpillar

CONFIDENTIAL TIBU4369-00
TECHNICAL INFORMATION BULLETIN October 13, 2004
MARINE ENGINES 3508B (S2A S2B)
3512B (S2G S2H)
3516B (S2P S2R)
Component Code(s) 1021SUBJECT: The "Droop (%)" parameter cannot be set using the ET Service Tool as stated in the 3500B Series II Marine Gen Set Engines Troubleshooting Guide.
PROBLEM:
The "Droop (%)" parameter cannot be set using the ET Service Tool as stated in the 3500B Series II Marine Gen Set Engines Troubleshooting Guide (RENR5004).
The droop set point parameter Droop (%) is not available under the system configuration parameters screen in ET. The parameter can therefore not be adjusted from its factory default value of 0% using ET. The Droop (%) parameter is supported in the ECM software but is not supported by the latest release of the ET Service Tool.
SOLUTION:
EP PWM Droop Control of Desired Engine Speed: You will be controlling the droop set point by supplying the ECM with a variable pulse width modulator (PWM) input signal. Input a 10% ? 90% duty cycle PWM signal into pin J2-69 of the ECM. The engine will run at 0% droop when pin J2-69 sees a 90% duty cycle and at 10% droop when pin J2-69 sees a 10% duty cycle. The droop settings will be linear between these two points. Use the PWM converter (part number 9X-9591) speed brick to do this.
Duty Cycle Droop (%)
90 0
80 1.25
70 2.5
60 3.75
50 5
40 6.25
30 7.5
20 8.75
10 10
Table 1
PERMENANT CORRECTIVE ACTION: The release of ET2004B-SP1 in February of 2005
COPYRIGHT 2004 CATERPILLAR
ALL RIGHTS RESERVED