Precision Digital PD554 - Manual (Page 57)

External AC
Power
External DC
power
To prevent electric shock, be sure to turn off power to the Nova Controller and the source circuit
breaker before wiring.
(1) DC Auxiliary Relay
(2) AC Auxiliary Relay
CR Filter (snubber)
(Connect directly to the relay coil terminals)
Controller
R
!
CAUTION
!
CAUTION
7.12 Communication Wiring (RS-485)
!
CAUTION
„ Up to 31 slave controllers (Nova series controllers equipped with the RS-485 serial communication
option) can be connected.
„ Be sure to connect terminating resistors (220
Ω, 1/4 W) to slave and master controllers at
communication channel ends as shown above.
Master Station NOVA Controller
Terminating Resistor
SHIELD
RTX+
RTX+ RTX+
RTX- RTX- RTX-
SG
SG
SG
R
Relay
(Verify relay coil ratings are less than the voltage and current ratings of the relay
contacts of the controller)
Diode
(Connect directly to the relay coil terminals)
Controller
!
CAUTION
!
CAUTION
Terminating Resistor
NOVA Controller
Relay
(Verify relay coil ratings are less than the voltage and current ratings of the relay
contacts of the controller)
PD550 Series Nova Programmable Process and Temperature Controller Instruction Manual
57