Johnson Controls YORK YK Style G OPTIVIEW User Manual

SECTION 3 - DISPLAY MESSAGES
JOHNSON CONTROLS
195
FORM 160.54-O1
ISSUE DATE: 9/10/2014
3
Motor Or Starter – Current Imbalance
The three phase compressor motor current imbalance
was greater than 30% continuously for 45 seconds. The
imbalance is not checked until the chiller has been run-
ning for at least 45 seconds and the average of the three
phases of motor current is greater than 80% of the pro-
grammed 100% chiller Full Load Amps. The average
is calculated as:
Iave =
(Ia+Ib+Ic)
3
The imbalance is calculated as:
(Ia-Iave) + (Ib-Iave) + (Ic-Iave)
x 100
2(Iave)
The Style B Solid State Starter and Variable Speed
Drive detects the unbalance condition and advise the
OptiView Control Center Microboard via serial com-
munications. The Style A Solid State Starter and Vari-
able Speed Drives returns the 3-phase motor current
values to the OptiView Control Center Microboard
where the unbalance calculation is performed. This
safety shutdown is not performed on Electro-Mechani-
cal Starter applications.
Thrust Bearing – Proximity Probe Clearance
(Style E and earlier chillers with G, H or J compressors
and Style F and later Chillers with J or H3 compressors)
The clearance between the compressor high speed
thrust collar and the tip of the Proximity Probe has in-
creased more than +10 mils or decreased to less than
-25 mils (for 2 continuous seconds) from the Refer-
ence Position. The minimum allowed clearance is 23
mils. Therefore, if the Reference position is less than
47 mils, the shutdown will occur when the actual clear-
ance is less than 22 mils.
If equipped with software version C.MLM.01.10.xxx
(and later) or C.OPT.01.10.302 (and later), the opera-
tion is as follows: the clearance is only checked during
the last 20 seconds of System Prelube, during System
Run and during coastdown. Therefore, the fault is only
detected during those periods. Also, the +10mil thresh-
old must be exceeded for 2 continuous seconds (instan-
taneous with previous software).
This shutdown must be evaluated by a
qualified Service Technician prior to
starting the chiller. Starting the chiller
without this evaluation could result in
severe compressor damage. To prevent the
chiller from starting without the proper
evaluation, restart is inhibited until the
clearance is within acceptable limits and a
special reset procedure is performed by the
Service Technician. The evaluation and
reset procedure are contained in Optiv-
iew Control Center - Service Instructions
(Form 160.54-M1).
Thrust Bearing – Proximity Probe Out Of Range
(Style E and earlier chillers with G, H or J compressors
and Style F and later Chillers with J or H3 compres-
sors)
The clearance between the compressor high speed
thrust collar and the tip of the Proximity Probe has de-
creased to less than 17 mils.
If equipped with software version C.MLM.01.10.xxx
(and later) or C.OPT.01.10.302 (and later), the opera-
tion is as follows: the clearance is only checked during
the last 20 seconds of System Prelube, during System
Run and during coastdown. Therefore, the fault is only
detected during those periods.
This shutdown must be evaluated by a
qualied Service Technician prior to start-
ing the chiller. Starting the chiller without
this evaluation could result in severe
compressor damage. To prevent the chiller
from starting without the proper evalua-
tion, restart is inhibited until the clearance
is within +10 to -25 mils of the Reference
Position and a special reset procedure
is performed by the Service Technician.
The evaluation and reset procedure are
contained in OptiView Control Center -
Service Instructions (Form 160.54-M1).

Johnson Controls YORK YK Style G OPTIVIEW Specifications

General

Brand	Johnson Controls
Model	YORK YK Style G OPTIVIEW
Category	Chiller
Language	English