18
Installation
3.3 Alarms and Relays
The controller is equipped with three unpowered relays rated 100–230 V ac,
50/60 Hz, 5 amp resistive maximum.
3.3.1 Connecting the Relays
The relay connector accepts 18–12 AWG wire (as determined by load
application). Wire gauge less than 18 AWG is not recommended.
Danger: Relay loads must be
resistive. User must externally
limit current to the relays to
5 Amps by use of a fuse or
breaker.
The controller contains three relays designed for use with high voltage
(greater than 30V-RMS and 42.2V-PEAK or 60 V dc). Refer to Figure 18 for
connection information. The wiring is not designed for low voltage connections.
Relay must not be powered from the same wiring used to power the controller.
See section 4.6 on page 34 for relay setup details.
Danger: ac power terminals are
designed for single wires. Do not
use more than one wire in each
terminal.
The Normally Open (NO) and Common (COM) relay contacts will be connected
when an alarm or other condition is active. The Normally Closed (NC) and
Common relay contacts will be connected when an alarm or other condition
is inactive or when power is removed from the controller.
Figure 18 Alarm and Relay Connections
3.3.2 Connecting the Analog Outputs
Two isolated analog outputs (1 and 2) are provided, see Figure 19. Each output
can be set to 0–20 or 4–20 mA, and can be assigned to represent the measured
parameter or secondary measurement such as temperature. Make connections
with twisted-pair shielded wire and connect the shield at the controlled component
end or at the control loop end. Do not connect the shield at both ends of the cable.
Use of non-shielded cable may result in radio frequency emission or susceptibility
levels higher than allowed. Maximum loop resistance is 500 ohm. Refer to
section 4.5 on page 32 for output software setup.
NCNCNC
COMCOMCOM
NO
F1
F2
NONO
RELAY CRELAY BRELAY A
J1
J2
J4
S1
NETWORK
INTERFACE
CARD
J3
J5
J6
U5
U9
J5J5
NCNCNC
COMCOMCOM
NO
F1
F2
NONO
RELAY CRELAY BRELAY A
J1
J2
J4
S1
NETWORK
INTERFACE
CARD
J3
J5
J6
U5
U9
J5J5
J5 J6 J7
3
2
1
RELAY A RELAY B RELAY C
Disconnect
Power
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