York YK-EP Operation And Maintenance Manual page 248

0.4VDC indicates the starter is an A style Solid State Starter and the microprocessor reads channels
1 through 7.
In the Solid State Starter, channel 0 indicates the starter size (model) and voltmeter range (300VAC
or 600VAC). Channel 1 is a hardware generated 100% FLA (prevents pre-rotation vanes from further
opening) or 104% FLA (closes pre-rotation vanes until motor current is less than 102%) current
limit override command that overrides normal Pro-rotation Vanes control. Channels 2 through 4
are analog voltages that represent phase A, B and C motor current. The highest phase is Channels
5 through 7 are analog voltages that represent phase A, B and C Line Voltage. The data for each
channel is shown on the below.
Table 211: Multiplexer channels
0
CM-2 GND
Starter model/
Style A SSS voltmeter
range
Style B SSS interface
Style B Solid State Starters produced before June 2008 can communicate with the 031-03630-007
Microboard via the Opto-coupled COM5 serial data port (J15) using YORK proprietary protocol. The
serial data is represented by +5VDC and 0VDC logic levels. TX data to the starter is at J15-1. RX data
from the starter is at J15-2.
Style B Solid State Starters produced after mid 2008, communicate with the 031-03630-007
Microboard via the COM 2 serial port (J13) using RS-485 Modbus protocol. The COM 2 Modbus
communications may use the fiber optic interface for better noise immunity and elimination of
potential ground loop problems when the Solid State Stater is equipped with the compatible 02505
Logic/Trigger control board.
When SSS-Mod B is selected as the motor drive type on the SETUP Screen, additional setpoints must
be entered on the screen. The appropriate serial port (COM 2-Modbus or COM 5 YORK) must be
enabled using the Motor Communications Protocol setpoint. The selections are Modbus or "YORK".
When Modbus is selected, the Motor Node ID setpoint must be set to match the setting of the
Starter Logic/Trigger Board Modbus Address Switch SW1. They must be both be set to "1".
Variable Speed Drive interface
Variable Speed Drives produced before March 2007 communicate with Microboard 031-03630-007
via the Opto-coupled COM5 serial data port (J15) using the YORK proprietary protocol. The serial
data is represented by +5VDC and 0VDC logic levels. TX data to the starter is at J15-1. RX data from
the starter is at J15-2.
Variable Speed Drives built after March 2007 communicate with Microboard 031-03630-007 via the
COM2 serial data port (J13) using RS-485 or fiber optic Modbus protocol.
With Microboard 031-03630-007 when "VSD-60Hz" or "VSD-50Hz" is selected on the SETUP Screen
as the Motor Drive Type, additional setpoints must be entered on this Screen. The appropriate
serial port (COM2-Modbus or COM5-YORK) must be enabled using the Motor Communications
Protocol setpoint. The selections are Modbus or "York". When Modbus is selected, the Motor Node
ID setpoint must be set to match the setting of the VSD Logic Board Modbus Address Switch SW3.
They must be both set to "1".
There are two different types of Modbus protocol used. Modbus ASCII for Mod D/Vyper and
Modbus RTU for Raptyr. When VSD – 60Hz or 50Hz is selected for the Motor Drive Type setpoint on
the SETPOINTS Screen, the microboard will poll on COM 2 alternating between the two protocols
until one of them responds or until an initialization fault occurs. Once a valid response is received
248
1 2
GND GND
Phase C
Current limit
motor
command
current
3 4
GND GND GND
Phase B Phase A
Phase A
motor motor
line voltage
current current
YK-EP Style B Centrifugal Chiller
5 6 7
Peak Motor
GND Current
(%FLA)
Phase B Phase C
line voltage line voltage