Manifold Air Pressure Input Fault; Pid At Zero Fault; Troubleshooting Procedure - Woodward 723PLUS Installation And Operation Manual

723PLUS Digital Marine Control

Manifold Air Pressure Input Fault

The Manifold Air Pressure input fault is latched when the sensed input signal
goes outside of the 2 mA and 21.0 mA range. The status of the fault is found at
prompt MANIFOLD INPUT FAIL in either the *MINOR ALARMS* or *MAJOR
ALARMS* header, if the Manifold Air Pressure Input Fault has been selected as
one of these alarms. If the Manifold Air Pressure Input is used, we recommend
that the Manifold Air Pressure Fault be configured to activate one of the alarms.
The speed control PID at zero fault is latched when the speed control PID output
has integrated to the minimum fuel level. The PID at zero fault is an indication
that the engine is being motored by the other unit. The fault has its own fault
delay time. The delay time is set at the prompt PID @ ZERO TIME. The
minimum fuel level is also adjustable. The PID @ ZERO LEVEL is the actuator
LSS percent used to determine where "minimum" fuel is. PID @ ZERO TIME and
PID @ ZERO LEVEL are found in ALARM/SD CONFIGURE. Depending on the
linkage arrangement, the PID @ ZERO LEVEL should be set near minimum fuel
and lower than the lowest actuator LSS command for normal operation. The
status of the fault is found at prompt PID @ LOW LEVEL in either the *MINOR
ALARMS* or *MAJOR ALARMS* header, if the PID at Zero Fault has been
selected as one of these alarms. If the PID at Zero is used, we recommend that
the PID at Zero fault be configured to activate one of the alarms.

Troubleshooting Procedure

Table 6-1 is a general guideline for isolating system problems. The service
personnel should be thoroughly familiar with the contents of this manual as well
as governor theory involving precise control of engine speed. This guide
assumes the system wiring, soldering connections, switch and relay contacts,
and input and output connections are correct and in good working order. Make
the checks in the order indicated. Various system checks assume that the prior
check have been properly done.
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
86

PID at Zero Fault

Manual 02881
Woodward