vane response to chilled wate r temperature b elow deadband plus control point. It can be
adjusted on the LID from a set ting of 2 to 10, and the def aul t setting is 6.0. Increa sing either of
these settings will ca us e t he vanes to respond slow er than a lower setting .
The
PROPORTIONAL ECW GA I N
can be adjusted at the LID displa y from a setting of 1.0 to
3.0, with a default settin g of 2.0. Increase this s et ting to increase guide vane response to a
change in entering chil led water temperatu r e. The proportional ban ds and gain may be viewed/
modified on the Equipment S ervice3 table.
Demand Limiting
The PIC will r espond to the
ACTIVE DEMAND LIMIT
set point by limiting th e opening of the
guide vanes. I t will compare the set point to either
COMPRESSOR MOTOR LOAD
or
COMPRESSOR MOTOR CURRENT
(percentage), de pending on how the control is conf igured
for the
DEMAND LIMIT SOURCE
which is acc essed on the SERVICE1 table. The default
setting is current limiting.
Machine T imers
The PIC maintains 2 runtime clocks, known as
COMPRESSOR ONTIME
and
SERVICE
ONTIME. COMPRESSOR ONTIME
indicates the total lifetime compressor run hours. This timer
can register up to 500,000 hours be fore the clock tu rns back to zero. The
SERVICE ONTIME
is
a resettable timer that can be used to indicate the hours since the last service visit or any other
reason. The time can be cha nged through th e LID to what ever value i s desired. Thi s timer can