SAF OPAL LT - Manual (Page 8)

Motor Protection
7
ominal current to 2 sec. at 600% of nominal
urrent.
en one or two phases are missing
r more than 1 sec.
op
urate indication of the Phase Loss LED.
only when
erminal 3 is connected to Neutral.
d Reset Circuits
nect Mains
oltage.
Electronic Overload
The built-in inverse
time electronic
overload becomes
operational after
end of acceleration
process. Trip
current is factory set
to 115% of Motor
Full Load Current
(from the setting on
Motor FLC
potentiometer),
E.g. In order to
increase the O/L trip point; increase FLC setting above
the calculated level. Trip time varies from 60 sec. at
150% of n
c
Phase Loss
The protection becomes operational when the starter is
energized; it protects the motor from single phasing. It
will trip the starter wh
fo
When phase loss occurs during starting or when motor
is not loaded, it may happen that motor will st
without acc
Note: Phase loss protection operates
T
Fault Logic, Alarm an
Upon operation of
any protection, the
starter locks in a
fault mode,
disabling thyristors
firing. The proper
fault indication
LED lights and the
Fault contact closes.
To reset the starter,
after the fault has
been removed, press
Reset button on
starter's front panel
or discon
Heatsink Over temperature Protection
v
A thermal sensor mounted on the heatsink trips the
starter when its heatsink temperature rises above 85ºC.
1
10
100
1000
0 2 4
I(Load)/In
Se
c
ond
s
6 5 3 1
Warning
The Over-temperature Protection is designed to
operate under normal conditions and will operate
incase abnormal conditions occur:
• Incorrect starter selection
• Too frequent starting at max. conditions
• Repeated starting under fault conditions
• Extended low overload
• Insufficient ventilation
• Other abnormal conditions
Note- In case of frequent starting the internal
thyristors may overheat before the heatsink reaches
its over-temperature protection of 85ºC, thus
causing component malfunction.
Caution
When starter is operated by a maintained contact,
resetting the fault will start the motor immediately.
Warning
Do not use the Fault contact to trip an upstream
contactor. When the Fault Contact closes on fault
and trips the upstream contactor, Mains voltage
will be disconnected, thus resetting the RVS-AX
and the motor will restart instantaneously (see
Fault Resetting).
On
Ramp Up / Down
Run
Overload
Phase Loss
Over Temp.
Reset