hager HZI855, Instruction Manual, Page: 52 / 65

6LE007317A 52
13.2. Annex II: Timers list
These options can be configured in the Parameters / Timers menu:
Operation timers
Trigram Timer Description Selectable range By default
1FT S1 FAILURE TIMER (s)
Source 1 Failure Timer:
When source 1 is considered lost, 1FT is started. If source 1 is considered
restored before the end of 1FT, the changeover sequence will not be
engaged.
0 … 60 s 3 s
1RT S1 RETURN TIMER (s)
Source 1 Return Timer:
When source 1 returns, 1RT is started. At the end of 1RT, source 1 is then
considered to be present.
Should source 1 disappear before the end of 1RT, the changeover will not be
carried out. In case the alternate source disappears during 1RT, a dynamic 3
second delay will override the 1RT time setting value.
NOTE: this timer is only available in MM (MAIN - MAIN) applications. In
other applications, the timer is replaced by the AVAILABILITY TIMER (1AT).
0 … 3 600 s 180 s
2FT S2 FAILURE TIMER (s)
Source 2 Failure Timer:
When source 2 is lost, 2FT is started. If source 2 is restored before the end of
2FT, the changeover sequence is not started.
0 … 60 s 3 s
2RT S2 RETURN TIMER (s)
Source 2 Return Timer:
When source 2 returns, 2RT is started. At the end of 2RT, source 2 is then
considered to be present.
Should source 2 disappear before the end of 2RT, the changeover will not be
carried out.
NOTE: this timer is only available in MM (MAIN - MAIN) applications. In
other applications, the timer is replaced by the AVAILABILITY TIMER (2AT).
0 … 3 600 s 5 s
1AT / 2AT
S2/S1 AVAILABILITY
TIMER (s)
Source (1/2) Available Timer:
Stabilisation time delay for voltage and frequency on Source (1/2). 1/2AT
starts as soon as the source voltage is above the hysteresis value. Transfer
to Source 2 may be done at the end of this time delay.
NOTE: this timer is only available in MG and GG (main-genset or genset-
genset) applications. In MM applications, the timer is replaced by the
RETURN TIMER (1RT and 2RT).
0 … 3 600 s 180 s
DBT1 / DBT2
S1 or S2 DEAD BAND
TIMER (s)
Dead Band Timer:
This is the minimum electric dead time (blackout time) to respect when the
source is lost or when transfering between source. This defines the minimum
load supply downtime so as to allow residual voltages that may be generated
by the load (such as motors) to decay.
0 … 20 s 3 s
Genset timers
Trigram Timer Description Selectable range By default
1CT / 2CT
S1/S2 GENSET
COOLDOWN (s)
Source 1 or 2 (Genset) Cool Down Timer:
Following a return to prioritary source sequence, the genset on backup
source is kept running for the 1CT/2CT timer duration. This is intended to
cool down the genset (off load) before switching off.
0 … 600 s 180 s
1ST / 2ST
S1/S2 START
TIMEOUT (s)
Source 1 or 2 Genset start timeout delay:
This time delay is started as soon as the genset start signal is given. Should
source 1 or 2 not become available after timer 1ST/2ST has elapsed a “Fail
start” error message is displayed on the product LCD.
0 … 600 s 30 s
In order to ensure a good operation, make sure that
1ST and 2ST timers are longer than 1AT and 2AT.
Otherwise there will be a fault appearing on the screen
saying “GENSET FAIL TO START”. This is due to the
fact that the genset will always take longer to become
available.