Winco MDS50 - Manual (Page 7)

Page 5
four wire receptacle, with a center grounding pin. Four
wire 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”.)
C. 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 shutdown a unit to connect to the full load
terminal block , this is a safety switch only.
D. ENGINE CONTROL MODULE (ECM)
The ECM is a microprocessor based module that con-
trols the complete unit. It monitors all the engine safety
sensors such as oil pressure, water temperature,
overspeed, and 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 terminal
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
disconnecting 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 shutdown),
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 temperature 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 MDS65 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 adjustable 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 LOP shutdown circuit
is by-passed, and a 12 second wait period is initiated. If
frequency returns within this time period, LOP monitoring
resumes and operation continues normally. If frequency