Winco MD25K/C - Manual (Page 7)

PAGE 5 60706-120 41821
drop cords plugged into this receptacle may be split into
120 volt receptacles at a distribution box. This receptacle
is protected by a two pole 50 amp circuit breaker
mounted just above it. THIS RECEPTACLE UTILIZES
A SPECIAL HUBBELL PLUG.(HUBBELL PART
NUMBER “CS 6365”.)
B. Full Power Load Connections and
Breakers
This Mobile Diesel Power System is equipped with both
high voltage (480) and low voltage (208/240) main line
breakers. The breakers are interlocked with a lockable
bar to insure that only one breaker can be turned on at
a time.
A full power output terminal block is provided. This
terminal block is located below the main power breakers
and is accessible through the access door located just
below the main line breakers. If this access door is
opened with the unit running a safety switch will
disable the 12 volt system shutting the unit down. This
door must remain closed and latched at all times during
normal operations.
DANGER: PERSONAL INJURY
This unit will start as soon as the door is closed if the
start switch is in the run position. Do not use the
switch on this door to shutdwon a unit to connect to
the full load terminal block , this is a safty switch only.
C. ENGINE CONTROL MODULE (ECM)
The ECM is a microprocessor based module that controls
the complete unit. It monitors all the engine safety
sensors such as oil pressure, water temperature, over-
speed., overcrank and shuts the unit down should any
one of the sensor circuits show a fault.
1. Control switch inputs
The following front panel controls and instruments are
wired into the microprocessor through the ECM termi-
nal blocks.
a. Run-Off-Auto switch:
1). “Run” - This is your local operation position. In this
position the engine will start immediately.
2). “Off” - position prevents unit operation by disconnect-
ing all power to the ECM.
3). “Auto” - position powers up the ECM in a standby
mode. A remote switch closure is required to activate the
start circuits.
2. Safety inputs:
a. Low oil pressure shutdown -(LOP)- Monitoring of oil
pressure begins 12 seconds after the unit starts, and
remains in effect until unit is shutdown by normal
control circuits (except as noted in “loss of frequency
input” below). The ‘LOP’ signal is derived from an oil
pressure gauge mounted in the engine control panel.
b. High water temperature shutdown -(HWT)- The
engine coolant sensor temperature monitoring begins
immediately with the start signal. If water temperature
is excessive at time of start, (i.e. heat soak after shut-
down), the unit is still permitted to start. The ‘HWT’
condition is permitted to exist for up to 60 seconds after
the unit initially starts before a shutdown WITH
ALARM occurs. If the excessive water temperature
condition is corrected within the initial 60 second period,
the ‘HWT’ circuit begins normal monitoring of the
engine temperature and the ‘safety shutdown’ circuit is
reactivated. The ‘HWT’ signal is derived from a tem-
perature gauge mounted in the engine control panel.
c. Overspeed adjustment -(OS)- Overspeed protection is
provided by a frequency sensing network within the
controller. The trip point of the frequency network is
adjustable via a rheostat located in the center of the
controller. The adjustment is accessed through the
small hole in the center of the engine control module.
NOTE: Use a plastic or non-metallic screwdriver when
making any adjustment to the overspeed. Clockwise
(CW) rotation increases the tip frequency, and thereby
raises the shutdown speed. The frequency input is
obtained from the engine battery charging alternator.
d. Overcrank -(OC)- The MD25 is designed to use cycle
cranking. This feature provides a series of five cranking
cycles lasting 12 seconds with a 12 second rest period
between each. Failure of the engine to start by the end
of the fifth crank period results in an “overcrank”
shutdown and alarm indication.
3. Cranking disconnect signal
The cranking disconnect signal is obtained from the
frequency sensing network within the controller. The
trip point of the crank disconnect is not directly adjust-
able but is a percentage of the overspeed adjustment.
4. E.C.M. - Program notes
a. Loss of frequency input - In the event the input
frequency goes to zero (engine runs out of fuel, battery
charging alternator fails, etc), the L.O.P. shutdown
circuit is by-passed, and a 12 second wait period is
initiated. If frequency returns within this time period,
L.O.P. monitoring resumes and operation continues