Johnson Controls YORK OPTIVIEW YK Series Service Instructions Manual page 304

SECTION 35 - SOFTWARE ENHANCEMENTS
SI0006 - SOFTWARE ENHANCEMENTS EFFECTIVE MAY 2001 (CONT'D)
COMPRESSOR MOTOR VARIABLE SPEED
DRIVE
1. The compressor motor Variable Speed Drive
(VSD) Phase A, B and C output current to the mo-
tor is now displayed on the VSD TUNING screen.
2. The new 351HP VSD is supported. In this model,
the three inverter assemblies are mounted on a
single baseplate instead of three individual heat
sink assemblies like other models. Therefore, the
VSD DETAILS screen and the HARMONIC FIL-
TER DETAILS screen display a single baseplate
temperature instead of the Phase A, B and C tem-
peratures displayed on other models.
OIL PUMP VARIABLE SPEED DRIVE
In previous flash memory card versions, the oil pump
VSD starts at 25Hz when turned on during System Pre-
lube. In this version, the VSD starts at 45Hz, which
provides greater reliability in achieving the required 45
PSID target oil pressure at chiller start.
304
FORM 160.54-M1
JOHNSON CONTROLS