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3. Description of the control and supply
electrical interface
3.1 Power Supply Characteristics
The DS1 power supply characteristics are:
Parameter
Vaux – Voltage input range
Vaux – Max (active) power consumption Vaux P
Vaux – Max current consumption
Vaux – Maximum VA consumption
Vaux – Inrush limiter (peak current)
Table 1. Auxiliary supply input characteristics
3.2 Description of the DS1 output
DS1 provides the following 3 outputs, depending on the switch
status:
− Ready (dry contact closed when DS1 is ready to operate).
− Watchdog (solid-state output blinks to indicate that DS1 is
energized and processing its functions).
− Alarm (dry contact closed when DS1 shows functions in a
faulty way during operations)
Consult Outputs/Inputs in the following sections for more
details about the DS1 outputs.
Additional outputs are installed in the device so as to monitor
the internal pressure status as follows:
− Pressure OK (Output is high (+VSupply) when pressure is
OK)
− Pressure Warning (Output is high (+VSupply) when pressure
is below a first threshold)
− Pressure Low (Output is high (+VSupply) when pressure is
below a blocking threshold)
DS1 Position Sensing indication (Close/Open).
Closed (dry contact is closed when DS1 is in the closed
position).
Opened (dry contact is closed when DS1 is in the open
position).
3.3 Electrical characteristics of the outputs
The Ready and Alarm outputs are AC/DC insulated outputs
(dry contact).
Their electrical characteristics are illustrated in the graph
below. Compliance with the current rating is mandatory so as
to prevent damage to the dry contact.
The contact data and maximum DC load breaking capacity are
indicated in the table and graph below.
12
Symbol
Value
Unit
Vaux Vin
93 to 300
V
DC
150
W
MAX
2,5
A
RMS
220
VA
Vaux I
2
A
ILIM
PEAK
Contact data
Contact configuration
Contact set
Type of interruption
Rated current
Rated voltage / max switching voltage AC
Maximum breaking capacity AC
Limiting making capacity, max 4 s,
duty factor 10%
Figure 9. Ready and Alarm aux contact electrical ratings
Max. DC load breaking capacity
300
200
100
50
40
30
20
10
0.1
0.2
0.5
Figure 10. DC load break capacity of Ready and Alarm contacts
If the installation requires higher current, an auxiliary relay can
be used in order to replicate the contact and perform higher
current capability.
The Watchdog Output is a solid-state output that blinks in
order to verify system integrity, including monitoring of SW run-
ning inside the device.
Since this kind of output is continuously turning on/off (every
0.2 Sec), replication of this function by a mechanical relay with
higher current is not recommended.
The electrical characteristics of the Watchdog output are given
below.
Characteristics
Recommended Operating Conditions
Supply Voltage
250 VDC/AC
On-state current ION
<100mA
Operating Temperature
-20 °C +65 °C
Table 2. Watchdog output characteristics
Watch-Dog NC, others NO
single contact
micro disconnection
6 A
240/400 VAC
1500 VA
10 A
resistive load
1
2
5
DC current (A)
10
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