Swann AMI Codes-II Operator's Manual page 32

AMI Codes-II
Installation
Inductive load
Resistive load
Actuators
30
CAUTION
Risk of damage of the relays in the AMI Transmitter due to
heavy inductive load.
Heavy inductive or directly controlled loads (solenoid valves,
dosing pumps) may destroy the relay contacts.
 To switch inductive loads > 0.1 A use an AMI relay box avail-
able as an option or suitable external power relays.
Small inductive loads (max 0.1A) as for example the coil of a power
relay can be switched directly. To avoid noise voltage in the
AMI Transmitter it is mandatory to connect a snubber circuit in par-
allel to the load.
A snubber circuit is not necessary if an AMI relaybox is used.
A
B C
D
Resistive loads (max. 1A) and control signals for PLC, impulse
pumps and so on can be connected without further measures
A
Actuators, like motor valves, are using both relays: One relay con-
tact is used for opening, the other for closing the valve, i.e. with the
2 relay contacts available, only one motor valve can be controlled.
Motors with loads bigger than 0.1A must be controlled via external
power relays or an AMI relay box.
B
A AC or DC power supply
B AMI Transmitter
C External power relay
E
D Snubber
E Power relay coil
A AMI Transmitter
B
B PLC or controlled pulse pump
C
C Logic
A AC or DC power supply
A
B AMI Transmitter
C
C Actuator
M
A-96.250.571 / 050517