Carrier HS070-160 manual EXV Driver Module Fig

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 1I connect the individual coils (4 per valve) to neutral in a repeating sequence to drive the valves in incremental steps.

S E N S O R B U S C O N N E C T O R

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.-

RED STATUS LIGHT ~ -I=

;iREEN C O M M U N I C A T I O N LtGHT

2,4,6EiBARE G R O U N D ( C )

STEPPER

MOTOR 2

J4 -

STEPPER

MOTOR I

Fig. 17 - Keyboard/Display Module (I-ISIO)

COIL 4

COIL 4 3 2

I I

C O M M O N

\ A D D R E S S A D J U S T M E N T

(NOT SHOWN~ ON UNDERSIDE

Fig. 16 - EXV Driver Module (DSIO)

2 5