Adaptive Capacity Control (Acc) Details Screen - York YK-EP Operation And Maintenance Manual

Adaptive Capacity Control (ACC) details screen

Modbus protocol configuration
Figure 42: ACC details screen Modbus protocol configuration
This screen displays detailed information pertaining to the Adaptive Capacity Control (ACC). It is
shown above with the OptiView-to-VSD serial communications hardware/interface in the Modbus
Protocol Configuration. In this configuration, the microboard communicates directly with the VSD
Logic Board using Modbus protocol serial communications. The Microboard performs the ACC
function. The Motor Communications Protocol Setpoint (on the SETUP Screen) is set to Modbus in
this configuration. All Medium Voltage Variable Speed Drives (MVVSD) use Modbus protocol.
Note: Requires a login access level of SERVICE.
Table 116: Display only
Field/LED name
% Full Load Amps
Current Limit Setpoint
Motor Run (LED)
Output Frequency
116
Description
Displays the motor current as a percentage of chiller Full Load Amps
as calculated by the microboard from current values returned from
the drive Logic Board.
Displays the current limit setpoint value in use. This value could
come from a 0 to 20mA, 4 to 20mA, 0 to 10VDC or 2 to 10VDC input
in Analog Remote mode, PWM input in Digital Remote mode, E-Link
or SC-EQ communications interface in ISN Remote mode or locally
programmed value in Local mode.
Illuminated when the Control Center is commanding the drive to
run. Otherwise, it is extinguished.
Displays the frequency at which the drive is operating the motor.
This value is returned from the drive Logic Board.
YK-EP Style B Centrifugal Chiller