Fan Control - Detroit Diesel DDEC VI Application And Installation

5.11

FAN CONTROL

The purpose of the Fan Control feature is to electronically control engine cooling fan activation
and to provide a load for vehicle retardation, when required. DDEC VI Fan Controls are
designed to optimally control the engine cooling fan(s) based on engine cooling requirements.
Fan Controls are designed to use other system inputs such as A/C pressure switches and operator
requested fan operation.
5.11.1 OPERATION
DDEC VI continuously monitors and compares the coolant and intake manifold air temperature,
engine torque, engine operation mode, and various optional inputs to calibrated levels stored
within DDEC VI. These limits are factory configured based on application.
When these temperature levels exceed the preset fan ON temperature value, DDEC VI will enable
the fan control output(s) that activate the fan. The fan will remain on, cooling the engine with the
increased air flow until the temperature levels reach the preset fan OFF temperature.
DDEC VI provides fan control for four different fan configurations:
□ Single-speed fan (two outputs) (refer to section 5.11.2)
□ Single-speed fan (one output) (refer to section 5.11.3)
□ Dual fans (refer to section 5.11.4)
□ Two-speed fan (refer to section 5.11.5)
□ Variable speed fan without fan speed feedback (refer to section 5.11.6)
□ Variable speed fan with fan speed feedback (refer to section 5.11.7)
All information subject to change without notice. (Rev. 01/07)
7SA827 0701 Copyright © 2007 DETROIT DIESEL CORPORATION
DDEC VI ELECTRONIC CONTROLS APPLICATION AND INSTALLATION
5-53