SMAR PSI302P User manual

INSTALLATION MANUAL
PSI302P
PSI302P
VERSION 1
FIELDBUS POWER
SUPPLY IMPEDANCE
PSI302P
JUL / 02
PSI 302PME
FOUNDATION
TM

web: www.smar.com
smar
Specifications and information are subject to change without notice.
For the latest updates, please visit the SMAR website above.
BRAZIL
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Smar Argentina
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PSI302P – Instalation and Maintenance Manual 3
INTRODUCTION
The function of impedance in a power supply is to implement a circuit output impedance greater
than 3 K wich, in a parallel with the two terminators of 100 ± 2% each, results in a line impedance if
about 50. This impedance can be implement in a passive mode (50 resistance in series with a 100
mH inductance) or in an active mode, through a impedance control circuit.
DEFINITION
The fieldbus Power Supply Impedance is a non-isolated, active impedance control device, in
accordance with Standard IEC 1158-2. This device presents an output impedance wich, in parallel
with the two bus terminators (a 100W resistor in series with a 1 mF capacitor) required by the
standard, results in a purely resistive line impedance for a broad frequency range.
The PSI302P, (because of the power supplied, cannot be used directly in areas requiring intrinsic
safety specifications.
Figure 1 shows the Device Block Diagram. The PSI302P can be used in redundancy, connecting
their output (+ E -) in parallel. When this configuration is used, use external terminator (BT302) to
allow PSI302P change in case of failure, without Fieldbus interruption (See fig. 2).
As to its external physical characteristics, the PSI302P presents power supply and overcurrent
indication LEDs. The input terminal block has two terminals (1A e 2A), wich are connected to the
external 24 Vdc. The power supply indication LED is green and is must be energized while there is
external 24 Vdc power supply.

PSI302P – Manual de Instrução e Manutenção
4
The overcurrent indication LED is red and it must be energized only in case of overcurrent caused by a short circuit in
the plant or by an excessive number of connected deviced. Figure 3 and 4 shows a layout of device PSI302P.
Fig.1 - PSI302P Block Diagram
Fig. 2 – Redundancy of PSI302P
Fig 3 – Frontal View PSI302P-2 Fig 4 – Front View PSI302P-4
PSI302P-4: Eight terminals (3A to 10A) to implementation of 4 independent Fieldbus channels and a Dip Switch with 4
switches for interlinked of the internal terminador of the PSI302P-4. The Figure 4 shows a layout of device; to verify
that 4 Leds of flaw exists, one for each PSI302P.

PSI302P – Instalation and Maintenance Manual 5
PSI302P-4: Eight terminals (3A to 10A) to implementation of 4 independent Fieldbus channels and a Dip Switch with 4
switches for interlinked of the internal terminador of the PSI302P-4. The Figure 4 shows a layout of device; to verify
that 4 Leds of flaw exists, one for each PSI302P.
PSI302P-2: Four terminals (3A to 6A) to implementation of 2 independent Fieldbus channels and a Dip Switch with 2
switches for interlinked of the internal terminador of the PSI302P-2. The Figure 3 shows a layout of device; to verify
that 2 Leds of flaw exists, one for each PSI302P.
Obs: So much for the model PSI302P-2 as for the PSI302P-4, the terminals and Dip Switch they are the same, even
so for the model PSI302-2 only the connections are enabled for 2 channels. The key 1 in the position ON enables the
internal terminator (BT302) for the channel 1.
The energization indication LED is of green color, should be energized while there is external 24 Vdc power supply and
the overcurrent indication LED it is red color, being just activated when it happens current excess due to short circuit in
the plant or excess of connected equipaments.
INSTALLATION
The PSI302P – Fieldbus Power Supply Impedance is a device specially designed for panel installation and it can not
be installed in unshetered locations, as it can not be exposed to the weather.
Due to its great thermal dissipation capacity, the device may be installed in environments where the maximum
temperature reaches up to 50 °C, without requiring cooloing facilities. Connections to the panel may be done directly
by means of screws and nuts, or by means of a DIN rail in supports supplied with the device.
It can be fixed, the PSI302P through the rack or for the auxiliary support (optional)(Fig. 5) with the device:
Fig 5 – Dimensional Drawing
To fixing the PSI302P through the rack::
1- To fix the rack in DIN rail or directly by means of screws;
2- It fits for PSI302P in the rack.
To fixing the PSI302P through the auxiliary support::
3- To fix the supplied suports directly by means of screws;
4- It fits for PSI302P in the auxiliary support.
MAINTENANCE
The PSI302P - Fieldbus Power Supply Impedance is a rugged device wich practcally requires no type of preventive
maintenace. It is simply recommended to protect it from excessive dust accumulation and from excessively humid
environments wich might affects its output impedance.

PSI302P – Manual de Instrução e Manutenção
6
As for troubleshooting, the PSI302P has five indication LEDs and PSI302P-2 has three indication LEDs wich inform its
operation status. A green power supply LED informs that the PSI302P is appropriately powered. A red overcurrent LED
for each channel, will be lit should any abnormal condition occurs in the field wiring. These LEDs are able to detect
most problems wich may occur in a Fieldbus installation. However, other problems which are not detectable by the
LEDs may occur. Such problems should be: excessive noise introduced by the external power supply; impedance
lower than 20Ωin the communication line (consider that such impedance may not be purely resistive and, therefore not
detectable by the overcurrent circuit); and a DC voltage higher than 18 Vdc in the communication line. Such abnormal
conditions may be easily detected by measurement instruments.
Because the PSI302P is a simply and compact device, it is recommended that repair services be done by replacing
faulty modules instead of electronic components. Some eletronic components used in the PSI302P are highly accurate
and in the state-of-art, being therefore not easily found in ordinary retail stores. This is the reason why the PSI302P –
Fieldbus Power Supply Impedance ha been designed in modules, in order to simplify repair services and the
maintenance of spare parts.
TECHNICAL CHARACTERISTICS
Electrical Characteristics:
Power Supply:
24 to 32 Vdc ±10%
Output Current:
340 mA (máx).
Mechanical Characteristics:
Dimensions (LxPxH): 40x142x126 mm
Enclosure: Metallic box for panel mounting.
Mounting: With screws or by means of DIN rail.
DIN rail: TS35-DIN EN 50022 or TS32-DIN EN50035
or TS15-DIN EN50045.
Ambient Conditions:
Operation:
TAMB -20°C to 50°C @RH 10% a 95%, without
condensing.
Storage:
TAMB -50°C to 70°C @RH 5% a 95%, without
condensing.
Functional Characteristics:
Input Filter:
Attenuation of 10dB in the input power ripple @60 Hz.
Impedance Control:
Active impedance control.
Terminator:
Fieldbus terminator.
Safety Characteristics:
Output Overcurrente:
Limitated in 500 mA
Input Fuser:
2,5 A.
Atmospherics Discharges:
Inpout and output protected for surge suppressor.
Intrinsic Safety:
Cannot be used directly.
Aproximately Weight: 230g