Yaskawa MicroTrac DSD Drives System Input - Manual (Page 3)

INTRODUCTION
This Local I/O board, REQUIRED in
a system drive, allows communication with
the LAN, inputs from a Digital Tachometer
and other I/O. This board must be
mounted in the lower Local I/O board
position, and is interfaced to the Main CPU
Control PCB by connecting the 50
conductor ribbon cable (from J1 of this
board) to either J1 of the Main CPU Control
PCB.
HARDWARE DESCRIPTION
INPUT/OUTPUT INTERCONNECT
There are two header connectors (J2
- 26 pin, and J4 - 34 pin) on this board that
allow ribbon cable connection to Terminal
Transition Adapter PCBs with the same
connector pin/terminal count. This
terminal transition arrange-ment allows
input/output wiring for this board to be
accomplished without having to open the
power cube.
INPUT/OUTPUT DESCRIPTIONS
The following sections describe each
input and output in detail. Table 1
describes the PAC needed information.
Digital Tachometer Input. There is
provision for a Digital Tachometer input.
The Digital Tachometer signals A, A , B,
and B , may be input to this PCB. By
supporting all of these tachometer signals,
various tachometer configurations are
supported. If the motor is controlled in only
one direction, then only one stream of
pulses is needed to indicate its motion. If
the motor is controlled in two directions,
then two channels of pulses are required;
the relationship of the two streams
indicates the direction of motor shaft
movement.
The Digital Tachometer signals MARKER
and MARKER may also be input to this
board. These signals allow the drive to
know the exact position of the motor shaft.
The Digital Tachometer circuitry also
provides two LEDs that indicate the direc-
tion of rotation of the motor shaft. When
this board is mounted properly, these LEDs
are visible on the right hand side of the
drive. The Green LED (DS1), when lit,
indicates forward rotation. The Yellow LED
(DS2), when lit, indicates reverse rotation.
The signal names are labeled A, A , B, and
B , MARKER and MARKER .
Connection terminals are provided that will
supply TACH POWER (+5 Vdc), TACH RTN
(COMMON), and SHIELD tie points.
Analog Inputs. There is provision for 4
non-isolated analog inputs. The inputs
have a maximum range of +/- 10 Vdc with
respect to common, are single ended,
include a filter with a time constant of
about 1 millisecond, and have 50K ohm
input resistance. The overall A/D
conversion accuracy is +/- 0.4 % with 12
bits of resolution over the full scale range.
The signal names are labeled ANACH1
through ANACH4. Full scale range may be
less than the maximum range. The full
scale range is determined by the PAC
program.
Connection terminals are provided that will
3 I/O 786-10