Filter
Top Products
EXV Driver Module (Fig. 16.)
Inputs
~
Input on strip
32
am-c discrcre inputs (O?;-OFF).
When 24 vat are applied
across
thy
2 terminals in a
channel it is read as an ON signal. Zero
voIts
is read as
an OFF signal.
Outputs
~
Two stepper motor driver outputs
;tre
used to
drive the electronic expansion valves, Terminals I and 7
supply voltage to the valves. Terminals 2 through 5 and
8
through 1 I connect the individual coils (4 per valve) to
neutral in a repeating sequence to drive the valves in
incremental steps.
SENSOR BUS CONNECTOR
RED STATUS LIGHT
~
;iREEN COMMUNICATION
LtGHT
STEPPER
MOTOR 2
J4
-
STEPPER
MOTOR I
-I=
2,4,6EiBARE
GROUND(C)
Keyboard! Display Module (HSIO) (Fig.
17)
‘~‘he
onlv
function of the HSIO is to allow the operator
I(.)
cr)&*
municate with the processor. It is used to enter
confiyt~ra-
tions
and set points and to read data, perform tests and
set
schedules.-
Fig. 17
-
Keyboard/Display Module (I-ISIO)
COIL 4
COIL 4
I
3
2
I
COMMON
\
ADDRESS ADJUSTMENT
(NOT
SHOWN~
ON UNDERSIDE
Fig. 16
-
EXV Driver Module (DSIO)
25