rada DRV40, Product Manual, Page: 24 / 72

24
Alerts - Explained
DRV40 will issue an alert which is activated upon a breach of pre-established 'Above
Setpoint' and
'Below Setpoint'
values (factory d5
°C, -5 °C) located under
the 'Setpoints'
tab. Upon activation, the display on the DRV40 will read
'Temp
High' or
'Temp Low'
.
Important! This advisory feature cannot be disabled.
If the 'Activate Relay on Alert'
box is checked, this will enable a feature which can
be used to activate an auxiliary alarm or solenoid valve. A connection is made to a
set of single pole changeover relay contacts fused at 2 Amps (see
'Specification'
).
When the DRV40 is operating normally,
'C' terminal and 'NO' terminal of the relay
have continuity. Under the following circumstances, the
'C' terminal and 'NC' terminal
have continuity:
1. Power failure.
2. Start up sequence.
3. Outlet temperature causing an alert signal
(can be disabled via the 'Setpoints' tab of the
'DRV Programming Software'
)
4. Outlet temperature causing an error signal.
5. Internal fault on PCB.
6. Battery failure.
7. Thermistor failure.
DRV40 will also issue an alert if the preset 'Error Temp' value located under the
'Setpoints' tab is exceeded (the default is 65 °C). If the 'Error Temp'
is reached,
the display on the DRV40 will read 'Error Temp'
, the aforementioned relay will be
activated and the DRV40 will assume a position where no hot water can enter the
blend circuit.
Important! This safety feature cannot be disabled.
The 'Alert' and the 'Error Temp' activation can be relayed to a Building Management
System (BMS), a Local Area Network (LAN) or can be accessed online via the
integrated Modbus connection port if connected and programmed accordingly.
Relay
(also see 'PCB Connections' )