YORK INTERNATIONAL
59
FORM 160.60-O1
MICROCOMPUTER CONTROL CENTER (See Sect. 2)
The MicroComputer Control Center is factory mounted,
on the drive line, wired and tested. The electronic panel
automatically controls the operation of the unit in meet-
ing system cooling requirements while minimizing en-
ergy usage. For detailed information on the Control Cen-
ter, refer to Section 2 of this manual.
ENGINE CONTROL PANEL, CLUTCH, AND GEARBOX
In addition to integrating the YORK Controls with the CAT-
ERPILLAR Engine Controls, the ECP (Engine Control
Panel) serves as the primary control and protection sys-
tem for the drive line engine, clutch and gearbox.
The drive line clutch and gearbox control/protection/an-
nunciation is provided by the Drive Line PLC processor.
The PLC provides gearbox lubrication control/protection,
clutch failure protection and additional drive line related
protection. LED indication is provided by CATERPILLAR
alarm and indication modules for drive line related alarms
and shutdowns.
CLUTCH
The pneumatic clutch is designed to operate at 100 PSI
which is controlled by an air pressure regulator on the
CATERPILLAR drive line base. This regulator is supplied
by an air compressor supplied by the customer which
must provide at least 125 PSI.
GEARBOX (SPEED INCREASER)
The gearbox is provided by Nuttall Gear Corporation. The
gear box lube system comes pre-set at 15-20 PSI oper-
ating differential. The gear mesh is sprayed with oil for
proper operation. The gearbox is protected by pressure
and temperature transducers. Output RPM of the gear
box when the CATERPILLAR engine is at full speed is
3600 RPM.
FOR FURTHER INFORMATION ON THE CLUTCH AND
GEARBOX CONSULT THE CATERPILLAR DRIVE LINE
MANUAL.
ENGINE VIBRATION SENSOR
This is used on YB units only. This sensor uses a 4-
20mA input to measure vibration on the 3406 engine in
inches per second and can detect vibrations from 0.00 to
2.00 in./sec. This is read from an analog input in th I/O
Expansion Board and its reading are averaged on a 5
point rolling average. Once the vibration cutout level is
set, if at any time the vibration readings are within 20%
below the programmable cutout level for five seconds
continuously, the panel will issue a warning indication
and the message
WARNING – HIGH ENGINE VIBRATION DETECTED
will be displayed when the
STATUS
key is pressed.
This will persist until the vibration readings fall below 20%
below setpoint for five seconds continuously.
LOW GEAR OIL TEMPERATURE SWITCH
If a low gear temperature sensor error is detected while
the unit is stopped, the message
SUN 12:00 AM LOW GEAR OIL TEMP SENS FAULT
is displayed and the unit is prevented from starting. As
soon as the switch is determined to be in the closed
position, the unit is permitted to start.
GEAR LUBE PUMP
The gear lube system pump must not be energized when
the oil in the gear is below 60°F. The Cat Engine Control
Panel will not energize the gear lube system pump until
after a start command is received from the YORK Chiller
Control Panel.
The gear is equipped with an adjustable temperature switch
which will provide a contact closure when the gear oil
temperature is above the setpoint. The temperature set-
ting for the low gear oil temp. shall be set for 65°F.
Voltage will be supplied to the switch from the I/O Expan-
sion PCB in the YORK Micro Panel. The return signal
from the low gear oil temp switch shall be connected to
the I/O Exansion PCB.
ENGINE VIBRATION SENSOR
An engine vibration transmitter sensor was added to the
YB chillers. This sensor uses a 4 to 20mA input to
measure vibration on the 3406 engine in inches per sec-
ond and can detect vibrations varying from 0.00 to 2.00
in./sec. The new sensor is read from an analog input (J6-
2) on the I/O Expansion Board.
The present value of the engine vibration level can be
shown by pressing the
ENGINE DATA KEY
and holding
it until the message:
ENGINE VIBRATION LEVEL = X.XX IN./SEC.
is displayed. The number shown in the message above
is always the present level of vibration feedback from the
sensor.
In addition, the panel stores a programmable safety cut-
out level for the sensor. This cutout level determines when
the chiller issues a warning or an emergency safety stop
to the engine based on the vibration sensor feedback.
The engine vibration sensor cutout can be modified by
using a special access code. The display will show:
ENGINE VIBRATION SHUTDOWN = X.XX IN/SEC. (0.40/0.65/0.60)
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