Relays - Hach CD500 User Manual

Figure 6 Connect to DC power
Pin
1
2
3
4
5
Connect the relays
Electrocution hazard. Do not mix high and low voltage. Make sure that the relay connections are all
high voltage AC or all low voltage AC.
Fire hazard. Relay loads must be resistive. Always limit current to the relays with an external fuse or
breaker. Obey the relay ratings in the Specifications section.
Use the relay connections to start or stop an external device such as an alarm. Use wire that is rated
for 300 V. Use a minimum wire gauge of 18 AWG. Make sure to obey the relay connection
requirements in Specifications
power from the relays locally if there is an emergency or for maintenance.
1. Remove the power to the instrument.
2. Open the controller cover. Refer to
Table 4 DC wiring information
Connection
VIN1, 12–24 VDC (+)
VIN1, 12 VDC return (–)
VIN2, 12–24 VDC (+)
VIN2, 12 VDC return (–)
PE (Protective Earth)
D A N G E R
W A R N I N G
on page 3. Make sure to have a second switch available to remove
Open the controller cover
Typical color
Red
Black
Red
Black
Green
on page 10.
English 13