PSH150
user manual rev4
Page 10/15
3.4.3 Alarm codes
In case of internal or external faults an error code is reported on the display. When an error code is
reported the
“Alarm”
red LED blinks at 1Hz rate.
Display code
Description
Behaviour
V
A
!
W
Over-temperature
protection
The red LED blinks
The output is switched off
until the internal temperature
decreases to safe values
V
A
!
W
Short circuit
protection
The red LED blinks
The output current is limited
at the programmed value for
5 seconds, then the product
switches off for 10 seconds.
The cycle is repeated until
the short circuit is removed
V
A
!
W
Internal error
, non
recoverable
The red LED blinks
The output is switched off.
This error is caused by an
unrecoverable internal fault
V
A
!
W
USB power
, no mains
available
The product is powered
through USB and the input
mains is not present. The
user can navigate through
the menus. It can be used for
firmware upgrade without the
need of the input mains.
3.5 Parallel connection
Multiple PSH150 can be connected with the output in parallel for power increase and / or redundancy.
In this mode of operation, the field
“operating mode” (OP)
shall be set to
“Parallel” (PA).
The unit integrates an internal ORing circuit allowing paralleling several units for redundancy.
For proper operation the cable length connecting the PSH150 outputs to the load must have the same
length and cross-section. For optimal current sharing it may be necessary to slightly adjust one of the
two devices output voltage until the same current is delivered by the two units. It is recommended to
limit the load power to 80% of the sum of the individual output power of the paralleled units.
