Static Power iSTS W - Input Steady State Settings

iSTS W
– User Manual
Page 22
6
.7 Input Steady State Settings
These
figures define the upper and lower limits of deviation from the nominal voltage and current of the
input
power
that creates the fault condition to trigger the alarm and record the event.
S
1 steady state high value (%)
Default
value of 115%, can be changed from a nominal value of 105 to 125. This number will be set
as
percentage
.
Averaging
time constant for this parameter is defined by Steady state failure time typically 1.5 seconds.
S
1 steady state low value (%)
Default
value of 85%, can be changed from a nominal value of 70 to 95. This number will be set as percentage.
Averaging
time constant for this parameter is defined by Steady state failure time typically 1.5 seconds.
S
2 steady state high value (%)
Default
value of 115%, can be changed from a nominal value of 105 to 135. This number will be set
as
percentage
. Averaging time constant for this parameter is defined by Steady state failure time typically 1.
5
seconds
.
S
2 steady state low value (%)
Default
value of 85%, can be changed from a nominal value of 70 to 95. This number will be set as percentage.
Averaging
time constant for this parameter is defined by Steady state failure time typically 1.5 seconds.
Steady
state failure time (sec/10)
Default
value of 15, this value will be divided by 10 making the value of 1.5 seconds. This number can be
between
10
-30. This is the amount of time for the input power sources being outside of the limit values in order for
the
fault
condition to be determined as true. If this time is set to too small of a value it can cause erratic operation.
NOTE
: By default the unit operates with the intelligent out of sync delay. To turn off the intelligent sync delay DIP SW
2
must
be turned on. The below phase settings should only be changed when intelligent sync delay is off.
Phase
error detection normal (deg)
This
figure between 0 – 180 degrees, sets the maximum allowable separation between the two
supplies,
whereby
if the supplies fall out of phase by this amount, the user will no longer be able to perform a
manual
transfer
. The default is 10 degrees.
Although
the setting limit can be set from 0 to 180 degrees the consequence of transfer when asynchronous
may
result
in a non-seamless transfer to the critical load. Ferromagnetic devices will saturate and draw large
current
when
out of synchronism transfers are undertaken. The effect on some switch mode power supplies is
also
unknown
. The user should consult with the equipment manufacturer to ensure that damage does not result
from
out
of synchronisation transfers and what their recommended synchronisation limits are.
Setting
to “0” disables the transfer pushbutton operation.
If
the programmed value in the “Auto” column is exceeded no action takes place. Refer to “Phase error
detection
fault”
below.
Phase
error detection fault (deg)
This
is the degree of difference between phases of the supplies that will force a break time
between
automatically
initiated transfers due to supply source / output supply faults.
The
default value is “D” (Dynamic) which means the STS will calculate the break to insert for the degree
of
asynchronisation
.
This
can be set from 5 to 180 degrees. The recommended default is 30 degrees. Up until this value transfers
that
are
initiated from the system (except manually) will occur without a break. Once the displacement between
the
two
phases is more than this value, a break is inserted as defined by “Phase error detection break”.
iSTS W