PSD1220 & PSD1220-098
-
SIL 3 Power Supply, 24Vdc, 20 A, Zone 2, DIN Rail Mounting G.M. International ISM0370-3
10
Installation Procedure - 2nd step (only for PSD1220 or PSD1220-098 units in parallel/redundant configuration) - Section A:
Wiring of AC input, Fault contact output and pre-start up of power supply unit
RIGHT
LEFT
UP
BOTTOM
PSD1220
Vout adjust trimmer
PWR On LED
RIGHT
LEFT
UP
BOTTOM
PSD1220-098
Vout adjust trimmer
PWR On LED
Front view
AC Input
DC Output
Fault contact
+ + – –
N L
Bottom side view
Bottom side view
AC Input
DC Output
Fault contact
+ + – –
N L
The following images shows the wiring of AC input and Fault contact output terminal blocks for each PSD1220 or PSD1220-098 unit, used in parallel/redundant configuration with other
units (maximum 10 pieces).
Each unit must receive AC mains by means of a magnetic circuit breaker or switch with the following features:
B or C characteristic 8
÷
10 Amps when nominal low input voltage 110
÷
120 Vac
±
10% is used;
B or C characteristic 4
÷
6 Amps when nominal high input voltage 220
÷
240 Vac
±
10% is used.
The AC circuit breaker or switch separates each unit from other ones when they are connected to the same AC mains.
AC line internal fuses are not user replaceable. The unit cannot be repaired by the end user and must be returned to the manufacturer or his authorized representative.
To guarantee full redundance configuration from the input to the output of the whole power system (composed by two or multiple of two units, with a maximum of 10 units), it’s necessary
to use two AC mains (AC1 and AC2) with different Lines and Neutrals but the same Earth Ground connection. Half units of whole power system are connected to AC1 mains while the
other ones are connected to AC2 mains. However, each unit must receive AC1 or AC2 mains by means of a magnetic circuit breaker, which separates each unit from other ones.
At page 5 (for PSD1220) or 6 (for PSD1220-098), it’s shown a functional diagram of two units, used in parallel/redundant configuration with single or double AC mains.
PSD1220-098 has got plug-in screw connection terminal blocks (which are extractable):
- for AC input terminal block, cable stripping length is 7 mm and
use a typical cable section of AWG15 (maximum AWG11 or 4 mm
2
);
- for Fault contact output terminal block, cable stripping length is 7 mm and
use a typical cable section of AWG18 (maximum AWG14 or 2.5 mm
2
).
For each terminal block, tighten its screws with maximum 0.6 Nm torque.
PSD1220 has got plug-in spring connection terminal blocks (which are not extractable):
- for AC input terminal block, cable stripping length is 15 mm and
use a typical cable section of AWG15 (maximum AWG10 or 6 mm
2
);
- for Fault contact output terminal block, cable stripping length is 10 mm and
use a typical cable section of AWG18 (maximum AWG16 or 1.5 mm
2
).
In addition, could be useful the following tools to press spring during cable connection:
- for AC input terminal blocks, use 3.5 x 0.6 mm flat-blade screwdriver;
- for Fault contact output terminal block, use 2.5 x 0.4 mm flat-blade screwdriver.
RIGHT
LEFT
UP
PSD1220 or PSD1220-098
Vout adjust trimmer
PWR On LED
Front view
Trimmer for output voltage adjusting
(use a little cross head isolated screwdriver)
Power ON
green LED
Pre-Start up
:
power the AC mains
to turn on PSD1220 or PSD1220-098 unit: Power ON green LED, on front panel, is ON and 24 Vdc (factory setting)
output voltage is present on DC output terminal block.
See page 4 for more information about Power ON green LED signalling.
The output voltage can be measured on DC output terminal block by means of a voltmeter, positioning its leads with touch prods on terminal
block screws (for PSD1220-098) or on terminal block springs (for PSD1220).
Use the front panel trimmer for output voltage adjusting. Turn the trimmer clockwise (to the right) to increase output voltage (max. 26.1 Vdc)
or turn the trimmer counterclockwise (to the left) to decrease output voltage (min. 23.6 Vdc).
Warning:
for correct current sharing operation between units, the power supply modules must have output voltages calibrated within ± 0.3 V.
Finally,
unpower AC mains
, turning off PSD1220 or PSD1220-098 unit.
The following sub-step (pre-start up) must not be executed if each PSD1220 or PSD1220-098 output voltage factory setting to 24 Vdc is corrected for your applications.
Instead, execute this sub-step (pre-start up) if it’s necessary to set up a different value for each PSD1220 or PSD1220-098 output voltage in the range 23.6 to 26.1 Vdc.
For each PSD1220 or PSD1220-098 used in parallel/redundant configuration, execute the following sub-step, where only one unit at time is powered by AC mains, while other units are
in shutdown state by opening their AC input circuit breakers.
