PSD1220 & PSD1220-098
-
SIL 3 Power Supply, 24Vdc, 20 A, Zone 2, DIN Rail Mounting
G.M. International ISM0370-3
11
Start up of whole power system
: after wiring of the DC output lines and Current Sharing bus for each unit,
power AC mains
.
Therefore, each PSD1220 or PSD1220-098 unit turns on and the whole power system can drive the loads connected to the DC output lines.
Installation Procedure - 2nd step (only for PSD1220 or PSD1220-098 units in parallel/redundant configuration) - Section B:
Wiring of DC output, Current Sharing bus and start up of whole power system
At this step
AC mains is unpowered.
The following images shows the wiring of DC output and Current Sharing bus terminal blocks for each PSD1220 or PSD1220-098 unit, used in parallel/redundant configuration with
other units.
For correct current sharing operation, all PSD1220 or PSD1220-098 units used in parallel/redundant configuration must have their current sharing bus terminal blocks connected
together by wiring.
At page 5 (for PSD1220) or 6 (for PSD1220-098), it’s shown a functional diagram of two units, used in parallel/redundant configuration, where DC output and Current Sharing bus
connections are shown.
PSD1220-098 has got plug-in screw connection terminal blocks (which are extractable):
- for DC output terminal block, cable stripping length is 7 mm and
use a typical cable section of AWG12 (maximum AWG11 or 4 mm
2
);
- for Current Sharing bus 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 DC output terminal block, cable stripping length is 15 mm and
use a typical cable section of AWG11 (maximum AWG10 or 6 mm
2
);
- for Current Sharing bus terminal block, two equivalent poles are available for easy
daisy chain connection with other two units. 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 DC output terminal blocks, use 3.5 x 0.6 mm flat-blade screwdriver;
- for Current Sharing bus terminal block, use 2.5 x 0.4 mm flat-blade screwdriver.
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
Current Sharing Bus
CSB
Bottom side view
AC Input
DC Output
Fault contact
+ + – –
N L
Current Sharing Bus
CSB
