Yaskawa MicroTrac DSD Drives Digital Tach - Manual (Page 3)

INTRODUCTION
This Local I/O board allows inputs
from a Digital Tachometer and other I/O.
This board can be installed in either the
upper or 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 or
J9 of the Main CPU Control PCB.
HARDWARE DESCRIPTION
INPUT/OUTPUT INTERCONNECT
There are three header connectors
(J2 - 34 pin, J3 - 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 circuitry also
provides two LEDs that indicate the
direction 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 .
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
supply +10.0 Vdc reference, -10.0 VDC
reference, COMMON, and SHIELD tie
points. Each of the references will supply
up to 50 milliamps of current.
Differential Analog Input. There is
provision for one non-isolated differential or
3 I/O 784-10