FORM 160.52-M2
YORK INTERNATIONAL
3
VSD OIL PUMP GENERAL INFORMATION – MOD D CHILLERS
VSD OIL PUMP STYLE VARIATIONS
INPUT VOLTAGE RANGE
VSOP DRIVE PART
MAXIMUM OUTPUT
NUMBER
RATING
208 VAC / 60 Hz
024-30468-001
220 VAC / 60 Hz
230 VAC / 60 Hz
8.4 Amps
240 VAC / 60 Hz
380 VAC / 50 Hz
024-30468-002
440 VAC / 60 Hz
400 VAC / 50 Hz
4.2 Amps
415 VAC / 50 Hz
460 VAC / 60 Hz
575 VAC / 60 Hz*
* 575 Volt unit requires step-down transformer to supply 460 VAC to VSOP drive.
VSD OIL PUMP DRIVE OVERVIEW
The new YORK Variable Speed Oil Pump Drive (VSOP
Drive) is an air-cooled, transistorized, PWM inverter in a
very compact package. The VSOP drive has the same
four major components that most AC motor drives have:
pre-charge, rectifiers, DC bus, and the inverter. The VSOP
drive is not repairable, but is simply replaced if it fails.
The VSOP Drive has been added to Model “D” YK
Chillers to replace the mechanical valve system used in
the past to regulate oil pressure. This new system will
improve bearing lubrication by providing a higher oil pres-
sure during the pre-lube cycle, and provide a method of
regulating oil pressure to a specific programmed value
during the run time of the compressor.
Chillers manufactured before June of 1997 or a MOD
“C” YK chiller will require an EPROM upgrade for the
Microcomputer Control Center, and the logic board must
be changed to use the VSOP drive option. The follow-
ing EPROM version is required: C.02F.16 (Part Num-
ber 031-01431-002) for the standard chiller. Version
C.02T.16 (Part Number 031-01431-003) will be avail-
able for Remote Chiller Communications applications.
The Micro Board will change from a 031-01065-001 to
a 031-01065-002.
Chillers manufactured after June of 1997 will have the
above software EPROMs installed in the Microcom-
puter Control Center.
Chillers with a VSD on the compressor will have the
correct software for the VSOP drive if the software is
a version C.YKV.06.02 or later.
These EPROMs have the following operational enhance-
ments that revise Service Manual 160.49-M2 as follows:
KNOWN PROBLEMS
Early version of VSOP drive software did not work
properly with a YORK chiller. To verify the software
version on the VSOP drive, do the following: Open the
enclosure door and look for the VSOP drive in the up-
per right hand corner. In the center of the control board,
locate the square chip, approximately one square inch.
On this chip is a label. If the label has C13.XX on it, or
a lower number, the VSOP drive should be replaced.
A few of the VSOP drives have demonstrated a sensi-
tivity to line voltage disturbances, such that is caused
by the switching of power factor correction capacitors.
These line voltage disturbances cause the DC bus volt-
age to exceed a safe limit for an extremely short period
of time. New VSOP drives have a 50 msec. timer placed
on the high DC bus voltage shutdown. If you suspect
this is your problem, verify the software version as stated
in the previous paragraph. The software version that
contains this fix is a C30.2A. These drives will be avail-
able sometime in July of 1999.
SOFTWARE
VERSION
C30.1B
00131VIP
