Precision Digital PD540 - Manual (Page 55)

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 External Relay
(2) AC External Relay
RC Network (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)
PD540 Series Nova Digital Process and Temperature Controller Instruction Manual
55