Vaisala MMT330 - Manual (Page 123)

Chapter 4 _________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 123
Table 27 Relay State Examples
Criterion for
Relay Activation
Transmitter
Operation Status
NC-C
Connected
NO-C
Connected
Not chosen
Power off
aw below 0.5*
Measured aw
above 0.5
Measured aw
below 0.5
aw above 0.5*
Measured aw
above 0.5
Measured aw
below 0.5
Fault status
Measurement OK
Error active
Online status
Measurement live
Error active
* Hysteresis has an effect when relay switching is based on live measurement.
See section Hysteresis on page 121.
Enabling/Disabling Relays
You can deactivate the relay outputs for example for service purposes of
your system.
Setting Relay Outputs
NOTE When you have only one relay module installed, its relays are called
“relay 1” and “relay 2”.
When you have two relay modules, the relays of the module connected
to slot MODULE 1 are called “relay 1” and “relay 2” and relays
connected to slot MODULE 2 are called “relay 3” and “relay 4”.