Johnson Controls YORK OPTIVIEW YK Series Service Instructions Manual page 33

FORM 160.54-M1
Style B Solid State Starter or Variable Speed
Drive Interface
If equipped with either of these drives, the drive is in-
terfaced to the microboard via the Opto-Coupled COM
5 serial data port (J15). The serial data is represented
by +5VDC and 0VDC logic levels. The TX data to the
drive is located at J15-1 and J15-2 is RX data from the
drive. Refer to SECTION 12 - SOLID STATE START-
ERS and SECTION 13 - ADAPTIVE CAPACITY CON-
TROL Board for details of this interface.
Printer Interface
An optional Printer can be connected to COM1 RS-232
serial data port (J2). TX data to the printer is located at
J2-4 and J2-2 is the DSR (Data Set Ready or busy) signal
from the printer. Signal levels are standard RS-232. The
microboard sends data to the printer at the selected baud
rate until the printer buffer becomes full, whereupon the
printer asserts its Busy signal. The microboard suspends
data transmission until the printer can accept more data.
Each printer must be setup/configured to operate proper-
ly with the microboard. The Baud, Data Bits, Parity and
Stop Bits must be programmed on the COMMS Screen.
Other printer setup is performed on the Printer Screen.
Refer to OptiView™ Control Panel – Operation (Form
160.54-O1) for details of available printers and printer
setup instructions.
E-Link Gateway Interface
An optional E-Link Gateway printed circuit board can be
connected to the COM 4B RS-232 serial data port (J2).
J2-7 is TX data to the E-Link Gateway. The RX data is
located at J2-6. Signal levels are standard RS-232. The
E-Link Gateway polls system pressures, temperatures
and status from the microboard. It holds it for retrieval by
third-party devices. Refer to SECTION 17 - OIL PUMP
VARIABLE SPEED DRIVE of this manual.
Digital inputs
The I/O Board converts the 115VAC inputs to logic
level inputs for the microboard at J19. A 115VAC input
to the I/O Board is converted to a logic low (less than
1VDC). A 0VAC input to the I/O Board is converted to
a logic high (more than 4VDC). Refer to SECTION 5
- I/O Board of this manual for details of the I/O Board.
JOHNSON CONTROLS
SECTION 3 - MICROBOARD 031-01730-000
Digital Outputs
The microboard controls 115VAC relays and solenoids
via the I/O Board (via J19). The I/O Board contains
+12VDC relays that isolate the microboard low volt-
age circuits from the 115VAC device coils. Solid state
switching devices are used to control the relays. The
microboard energizes the +12VDC relays by applying
a ground to the coil input. They are de-energized by
opening the ground path. The contacts of these relays
switch 115VAC to system relays and solenoids. The
outputs that control the chilled liquid pump and com-
pressor motor starter have anti-chatter (anti-recycle)
timers associated with them. The output that controls
relay K0 is not allowed to change at a rate greater than
once every 10 seconds. The output that controls relay
K13 is not allowed to change at a rate greater than once
every 20 seconds.
The microboard controls actuator motors via triacs on
the I/O board. Each actuator has an open winding and
a close winding. Current flowing through a winding
causes the actuator to rotate in the respective direc-
tion. Each winding is controlled by a triac. The triac is
turned on to allow current to flow through a winding.
The microboard turns on the triac by applying a logic
low (less than 1VDC) to the triac driver on the I/O
board. It turns it OFF by applying a logic high (more
than 4VDC). Refer to SECTION 5 - I/O Board of this
manual for details of the I/O Board.
Analog Inputs
System pressures, in the form of analog DC voltages,
are input from Pressure Transducers. Refer to SEC-
TION 19 - PRESSURE TRANSDUCERS of this man-
ual. Formulas and graphs are included to calculate the
expected transducer output voltage for a given pressure
input.
System temperatures, in the form of analog DC volt-
ages, are input from thermistors. Refer to SECTION
20 - TEMPERATURE THERMISTORS of this manual.
Included are tables to convert the expected output volt-
age for any temperature applied to the thermistor.
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