5
PSD1206
- PSD1210
- SIL 3 - SIL 2 Switching Power Supply 24 Vdc
G.M. International ISM0076-7
Operation
PSD1206, PSD1210 provides fully floating 24 Vdc supply to drive process control equipment like instrumentation, control systems, PLC or loads requiring a stabilized voltage, located in
Safe Area/Non Hazardous Locations or Zone 2, Group IIC, Temperature Classification T4, Class I, Division 2, Groups A, B, C, D, Temperature Code T3 and Class I, Zone 2, Group IIC,
IIB, IIA Temperature Code T3 Hazardous Area/Hazardous Locations ensuring that the relevant safety installation conditions are respected. PSD1206 provides a 6 A, 150 W output
capability while the PSD1210 provides a 10 A, 250 W output capability. The power supply has a switching input and a power factor correction circuit resulting in a high efficiency module.
Output is provided with a decoupling diode that permits the parallel operation to increase the current capability or redundancy operation (note that for parallel operation the output voltage
must be separately calibrated at the same value through the “Vout Adjust” trimmer to improve the current sharing operation). Output voltage can be regulated within ± 5 % of the nominal
value.
Use an isolated screwdriver for trimmer adjustments.
Output circuit is protected by three independent overvoltage circuit: 1 voltage limiting loop at 27 Vdc and 1 + 1 crowbars
at 29 Vdc. Output circuit has under and over voltage detection with separate signaling by an optocoupled transistor; alarm output is normally closed (energized transistor), it de-energizes
when output voltage goes out of the ± 5 % range of the nominal value. It de-energizes also with an input voltage lack. Presence of supply power and normal working condition is
displayed by a green signaling LED: this is normally ON in normal operation, is OFF in overvoltage output or input voltage lack condition and is blinking in undervoltage or overload
condition. Units is equipped with trimmers for output voltage setting and for alarm threshold setting. Example of setting output voltage and alarm threshold: suppose to have a power
supply standard with 24 Vdc output and thresholds set at 22.8-25.2 V. Suppose you want to set the output at 25 V with 23.7-26.3 V threshold value. The procedure to be used is the
following: rotate the “Vout Adjust” trimmer until the voltage has reached the new upper threshold value of 26.3 V. Rotate the “Alarm Adjust” trimmer until the “Power ON” LED turn on,
then slowly rotate until the LED turn off; in this way you set the threshold value at 26.3 V. Finally rotate the “Vout Adjust” trimmer until the output voltage has reached the new requested
value of 25 V.
Installation
The terminal block are not usable as breaking device according to EN60950. The wiring cables have to be proportionate in base to the current and the length of the cable.
For PSD1206 typical cable section is AWG15 for input connection and AWG13 for output connection. For PSD1210 typical cable section is AWG12 for input connection and AWG10 for
output connection. Identify the function and location of each connection terminal using the wiring diagram on the corresponding data sheet, as an example:
Connect AC input mains power at terminal “L/+” and “N/-” to the “Supply Line” terminal block. Connect the terminal “ “ to the protective earth of the system.
Connect positive output at terminal “+” and negative output at terminal “-” to the “24 Vdc Output” terminal block (two connections provided).
Connect if required the alarm indication at terminal “+” and “-“ to the “Fault Output” terminal block, the alarm is provided by an optocoupled transistor normally closed (energized),
it de-energizes in fault condition of the power supply. In case of parallel or redundancy operation of the power supply, connect the terminal “CS” of the “Current Sharing Bus” terminal
block at each power supply in the system.
1.5
*
Vin_min
1.2
*
Pout
Itar
=
PSD1206, PSD1210 is a switching power supply housed in a light metal enclosure suitable for installation on T35 DIN Rail according to EN50022.
PSD1206, PSD1210 unit must be mounted with horizontal (standard) orientation for –20 to +60 °C ambient temperature operation range
, ensuring a proper free space of 5 cm
around the enclosure to let the necessary air flow for convection cooling.
Standard Orientation (OK)
Non Standard Orientation (Not permitted)
where Itar = circuit breaker current, Pout = requested output power, Vin_min = minimum supply voltage.
Electrical connection of conductors up to 4.0 mm² are accommodated by plug-in removable screw terminal blocks which can be plugged in/out into a powered unit without suffering or
causing any damage
(for Zone 2 or Division 2 installations check the area to be nonhazardous before servicing)
. On the data sheet and enclosure side a block diagram identifies
all connections. The input line is internally protected by fuses (1 for each line); connect an automatic bipolar “C” intervention characteristics switch, upstream the power supply line or
other equipment to ensure compliance with local regulations. For the choice of the input automatic circuit breaker protection, it is opportune to use the following formula:
