Fairford Electronics QFE Series, Manual

Page: 135 / 194

Programming
page 5-24
QFE
FD8420 issue02_F
12
C/L Time Out
The unit will trip if during start-up the unit’s output current reaches the
Current
Limit
level (
P30
)for a time specified in
Limit Time Out
(
P31
).
13
Overload
The unit will trip if the output current exceeds the previously set
Overload Level
(
P34
), and will trip in a time governed by the size of the load current and a previously
set arbitrary number,
Overload Delay
(
P35
), (see Figure 5.3.5d ).
14
Shearpin
The unit will trip if the output current exceeds the previously set
Shearpin Level
(
P32
) for a time set in
Shearpin Time
(
P33
), (see Figure 5.2.3c ).
15
Thermistor
(QFE+)
Assuming that a thermistor has been fitted and connected to the Auxiliary Function
Card, the unit will trip if the signal from the thermistor exceeds a value set by the
manufacturer.
16
User
This is a trip which can be triggered by the customer via a variety of means, i.e.
through the serial comms, or via a programmable input.
17
Comms Timeout
This trip occurs if occurs if there is no communication on the serial connection for
more than five seconds.
Trip Sensitivity
- See section 5.3.4
P126 Comms Trip
- See section 5.3.4
Cooling
- See section 5.3.4
Thermistor Trip
- See section 5.3.4
C/L Timeout
- See section 5.3.5
Low Current
- See section 5.3.5
Shearpin
- See section 5.3.5
Overload
- This switches
On
and
Off
the
Overload Trip
, see
section 5.3.5 . Special case: if a load current exceeding
7.2 x FLC occurs for longer than 60 mS, a
Shearpin
Trip
is forced whenever the
Overload
is
On
.
Sensing Signal
- This menu item switches
On
and
Off
Trip 7. This may
be useful if there is excessive noise on the supply
causing spurious
Trip 7 Sensing Signal
trips.