DPS-1 Installation and operation instructions 4189360002 Rev. C
Operating the DPS-1
Page 12 of 14
6.
Operating the DPS-1
The DPS-1 is designed to operate without manual intervention. It is equipped with a visual
and electrical indication/alarm that continuously monitors the input and output voltage
6.1
Voltage drop compensation
The power supply can be adjusted to compensate the voltage drop in the wiring between the
DPS-1 and the load. Examples of voltage drop can be found in the following table.
Wire cross section
(mm
2
)
Length (m)
Current (A)
Voltage drop* (V)
0.75
5
5
1.25
1.00
5
5
0.9
1.50
5
5
0.6
2.50
5
5
0.35
* The voltage drop is based on threaded copper wire at 20ºC
The voltage drop formula is: V = length x current x cable resistance x 2
(thus the double current or double length will also double the voltage drop.
Example: 1.5 mm2, 5 m, 5A => V = 0.6 V
Setting: 24.0 + 0.6 = 24.6 V
6.2
Visual and electrical monitoring
DPS-1 has two monitoring types:
•
Electrical monitoring: DPS-1 has a dry contact “DC OK” relay output which is closed
(energised) under normal operating conditions (no failure).
•
Visual monitoring: A green LED provides visual indication of the DPS-1 operational
status.
The behavior of the LED and relay is according to the following table:
Table 3
LED and DC OK relay functions
Status
LED
DC OK relay contact
Normal operation with or without load
Green
Closed
High temperature/power derating
Green
Closed
Reverse polarity connection on output
Green, flashing*
Alternate open and closed*
Overvoltage on output
Green, flashing*
Alternate open and closed*
Short circuit on output
Off
Open
No output voltage
Off
Open
No input voltage
Off
Open
Under-voltage on input
Off
Open
* Changes state every approximately 0.5 seconds.