12
3. Description of the control and supply
electrical interface
3.1 Power Supply Characteristics
The DS1 power supply characteristics are:
Parameter
Symbol
Value
Unit
Vaux – Voltage input range
Vaux Vin
93 to 300
V
DC
Vaux – Max (active) power consumption Vaux P
MAX
150
W
Vaux – Max current consumption
2,5
A
RMS
Vaux – Maximum VA consumption
220
VA
Vaux – Inrush limiter (peak current)
Vaux I
ILIM
2
A
PEAK
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.
Contact data
Contact configuration
Watch-Dog NC, others NO
Contact set
single contact
Type of interruption
micro disconnection
Rated current
6 A
Rated voltage / max switching voltage AC
240/400 VAC
Maximum breaking capacity AC
1500 VA
Limiting making capacity, max 4 s,
duty factor 10%
10 A
Figure 9. Ready and Alarm aux contact electrical ratings
0.1
0.2
0.5
1
2
5
10
10
20
30
40
50
100
200
300
resistive load
DC current (A)
DC voltage (VDC)
Max. DC load breaking capacity
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
Provided
by
Northeast
Power
Systems,
Inc.
(NEPSI)
