Static Power iSTS W - 7 Fault Diagnosis; Fault Codes; Load Fault

iSTS W
– User Manual
Page 25
Transfer
timer
The
default setting value is “0” which disables this function.
This
parameter sets a period in seconds that the STS will undertake a test transfer to the alternate source. After
a
delay,
the load will be returned to the original source. This function is used to test functionality and
protections
within
the STS.
7
FAULT DIAGNOSIS
7
.1 Fault Codes
Event Append
Description
STS Action Resulting
INIT
RAM
CHKsum failed – Cold Start (RAM Corrupt) – Flash
Defaults downloaded
None
- Contact Static Power
WARM BOOT
Power
-up, Warm Start, re-initialize all but RAM – Keeps
Event List
Normal After Black Start
SYNC FLT/OK/WRN
S1 & S2 not in synchronism
Alarm No action
SUPPLY 1 FLT/OK
Supply 1 has a fault or fault has cleared
When fault is detected transfers to
supply 2 if on 1
SUPPLY 1 TRANS
Supply 1 has Transient High or Low (1 sec)
Transfers to supply 2
if on 1
SUPPLY 1 AVG LOW/HIGH/OK
Supply 1 steady state is outside tolerance limits
When fault is detected, transfers to
supply 2 if on 1
SUPPLY 2 FLT/OK
Supply 2 has a fault or fault has cleared
When fault is detected transfers to
supply 1 if on 2
SUPPLY 2 TRANS
Supply 2 has Transient High or Low (1 sec)
Transfers to supply 1 if on 2
SUPPLY 2 AVG LOW/HIGH/OK
Supply 2 steady state is outside tolerance limits
When fault is detected, transfers to
supply 2 if on 1
SUPPLY 3 AVG
Output steady state is outside tolerance limits
Transfers to inactive supply
SUPPLY 3 TRANS
Outside has Transient High or Low (1 sec)
Transfers to inactive supply
CURRENT WARN/HIGH
Output is overloaded (timed shutdown)
Alarm No action starts timer
TRANSFER 1/2
Transfer to Supply 1 or 2 requested
User
- Manual Action
PREF 1/2/OFF
Preferred Source Set 1, 2 or none
User
- Manual Switch Only
SCR SC 1/2
SCR on
S1 or S2 short circuit detected on Supply 1 or 2
Contact Static Power
– Locks to safe
source
SCR OC 1/2
SCR on
S1 or S2 Open circuit detected on phase #
Contact Static Power
– Locks to safe
source
7
.2 Load Fault
Transfer
timer
In
case of sustained high current output load faults, the iSTS will inhibit a transfer to the alternate supply even
if
this
means degradation or loss of source supply. It is therefore imperative that you ensure that
the
discrimination
with downstream and upstream protective devices ensures that the downstream
protective
device
always clears the fault first. The transfer inhibit timer will automatically reset after 90 seconds.
In
case that all output is lost the faulty equipment should be located and removed from the iSTS output
before
re
-instatement of power.