Sulzer CA 462 Guide D'installation page 7

2
CONNECTION DIAGRAM
Electrical connection
2.1
If several sensors are to be used from the pump, then they must be connected together.
Leakage: Sensors must be in parallel.
It is very important to have in mind that this practice avoids alarms to be distinguished. Sulzer
highly recommends to use one module per signal to allow not only distinguishing but also acting
in a different way according to the alarm category/severity.
Temperature (Klixon or PTC): Sensors must be in series.
PTC or
Klixon
Connect terminal 12
to ground or housing
of the pump
Figure 1 Electrical connection diagram
When several CA 462 units are used, the reset buttons cannot be wired together. The solution is to use one
reset button to each unit or an external relay which control all the reset buttons as figure 2.
Reset all CA 462
External relay
Figure 2 Connection of reset function for multiple CA 462 units
If pump is operated from a motor drive or frequency converter, special precautions are required.
The high electric noise level can distort electrical readings and in extension jeopardize functionality.
To avoid conducted electrical noise, follow best practices and manufacturer EMC compliance recommenda-
tions when installing frequency converters. Use shielded cables and 50 cm separation between power and
signal cables. Ensure that the cables are also separated from each other in cabinets.
Pump contactor
maneuver
Power
Supply
Leakage
sensors
CA 462
Reset CA 462 - ...n
Reset CA 462 - 2
Reset CA 462 - 1
7
Output
Temperature
Alarm Relay
Output Leakage
Alarm Relay
Bridged if manual
reset is requested
Reset
switch
EN