Electro-Mechanical Starter Screen; Figure 33 - Electro-Mechanical Starter Screen - York OPTIVIEW YD Series Manual

FORM 160.79-O3
ISSUE DATE: 11/09/2018

ELECTRO-MECHANICAL STARTER SCREEN

FIGURE 33 - ELECTRO-MECHANICAL STARTER SCREEN

This screen displays all information pertaining to both
compressor motors operation when the chiller is using
Electro-Mechanical Starters. Also the Current Limit
setpoints are maintained here.
DISPLAY ONLY
Lead Compressor
Identifies the compressor that has been selected as the
lead compressor.
Chiller Current Limit Setpoint
Displays the Chiller Current Limit Setpoint. The Chill-
er Current Limit Setpoint could come from 0-20mA,
4-20 mA, 0-10 VDC or 2-10 VDC in Analog Remote
mode, PWM in Digital Remote mode, SC-EQ com-
munications interface in ISN (BAS) mode, or the Lo-
cal Chiller Current Limit Setpoint that is entered at the
Keypad. The Chiller Current is the total motor current
being conducted by the chiller. If only one compressor
motor is running, that is the Chiller Current. If both
compressor motors are running, the Chiller Current is
the total of both motors, with the Pre-rotation Vanes
operated to achieve equal current to both motors. The
Chiller Full Load Amps (FLA) is the total of compres-
sor #1 motor and compressor #2 motor FLA ratings,
JOHNSON CONTROLS
SECTION 2 – OPTIVIEW CONTROL CENTER
with each motor having an equal FLA rating. For ex-
ample, if the Chiller FLA is 1600 amps, the FLA of
each motor is 800 amps. The Chiller Current Limit
Setpoint is expressed as a percentage (30% to 100%)
of Chiller FLA. In this example, the chiller FLA is
1600 amps. If the Chiller Current Limit Setpoint is set
at 70%, the Chiller Current is limited to 1120 amps. If
only one motor is running, the Motor Current Limit
(see Motor Current Limit Setpoint below) for that mo-
tor would be set to 100% and it would be allowed to
operate at its maximum of 800 amps, However, if both
motors are running, each would be limited to 560 amps
per motor, producing a Chiller Current of 1120 amps.
This setpoint is in effect after the Lead Compressor
Pulldown Time setpoint (see below) has elapsed and
for the remainder of system run.
Motor 1 and 2
Motor Run (LED)
Illuminated when compressor #1 motor is being com-
manded to run. Otherwise, extinguished.
% Full Load Amps
Displays the motor current of compressor #1 motor as
a percentage of the full load amps of that motor.
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