Weidmuller PRO-H Series Power Supplies User Manual
Page 5
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Date:
28 September
2009
Issue: 1.0
Page
5
2.2.3.2 Active signal output
(Fig. 5.1, Fig 5.2, Fig 5.3 and Fig. 5.4):
11VDC ±1VDC (12VDC units), 22VDC ±2VDC (24VDC units) or 44VDC ±4VDC (48VDC units) is applied between the “DC-OK” (CP T SNT
70W 12V 6A and CP T SNT 90W 24V 3.8A: Connector J2, pin 3 / CP T SNT 140W 12V 12A, CP T SNT 180W xx and CP T SNT 360W xx:
Connector J2, pin 5 / CP T SNT 600W xx: Connector J5, pin 3) and “-“ (Connector J2, pin 1) and can carry up to 40mA max. (12VDC units) or
10mA max (CP T SNT 90W 24V 3.8A(N) or 20mA max. (other 24VDC units) or 15mA max (48VDC units). This signal output is referenced to –
Vout (GND) and signals when the output voltage drops below: 12VDC units between 9 and 11VDC; 24VDC units between 18 and
22VDC; 48VDC units between 36 and 44VDC by switching from high to low.
The DC-OK signal is decoupled from the power output. It is thus not possible for parallel-switched devices to provide external supply. The DC-
OK signal can be directly connected to a logic input for evaluation.
2.2.3.3 Signal loop:
The two above-mentioned signals can be easily combined.
Example: Monitoring of two devices.
Use the active signal output of device 1 and loop in the floating signal output of device 2. In the event of malfunctioning a common alarm is
available. Up to 5 units can be looped in. This signal combination saves wiring costs and logic inputs.
2.2.3.4 DC-OK LED:
The DC-OK LED is a two colour LED which indicates the status of the output and enables visual evaluation of the function locally in the control
cabinet. DC-OK LED green – normal operation. DC-OK LED red – output failure if input mains is still present.
3. Function
3.1 Output characteristic curve:
In the case that the ambient temperatures is not higher than +40°C, the device can continuousely supply Iout max (see datasheet). In the
event of a higher load, the operating point follows the U/I charateristic curve by use of overcurrent protection. The output current is limited at
Iout max. by use of a constant current characteristic with automatic restart if the short circuit or over load condition has been removed.
The U/I characteristic curve ensures that heavily capacitive loads can be fed without problems.
Current Limitation Curve of TSP Power Supplies
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Current Limitation Curve