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For temperature, the unit has 3 states of operation:
Temperature (temp)
State
-20° < temp <70°
Normal
-25° < temp <-20° or
Warning Temperature
70° < temp <85°
temp < -25° or
Alarm Temperature
temp >85°
The temperature value is not available on display.
WARNING: In Warning and Alarm states, the dispaly is turned OFF to preserve its functionality.
In case of Trip enable= DISABLE, the PR122/VF unit could work, with CB closed, in a range of temperatures within
which the correct operation of the trip unit is not guaranteed.
12.3.3.4. Load Protection
The Load Protection consists of LCs and Iw functions. The functions can be enabled/disabled on protection menu.
Single loads can be disconnected on the load side before the overload protection L opens the CB. This is done by contactors or
switch-disconnectors (wired outside the release), controlled by the PR122/VF and PR120/K external contacts.
On unit PR122/VF it is possible to select presence of LCs or Iw function, and to set thresholds.
Setting
Range Value
Threshold 1
ENABLE/DISABLE
50% I1...100% I1 (step 1%) Determines the threshold for LC1 Alarm
Threshold
Threshold 2
ENABLE/DISABLE
50% I1...100% I1 (step 1%) Determines the threshold for LC1 Alarm
Threshold
Threshold Iw
ENABLE/DISABLE
0.3In...10In (step 0.05In)
Threshold
Thresholds LC1 and LC2 are expressed as a percentage of I
WARNING: The LCs Alarm and Iw warning do not cause the CB to open by trip Coil, but the change of status of
the SW register does.
It is possible to have external monitoring, using PR120/K unit and setting external contacts to LC1, LC2, Iw status.
12.3.3.5. Trip performances and activation time
The following is a summary of Trip performance and tolerance, for all protections.
Protections
Setting
L
0.4In...1In
I
1.5In...10In
OT
Fixed by unit:
temp<-25° or temp>85°
WARNING: All tolerance refer to a primary signal with frequency within the range 0.2...1.25 of the nominal fre-
quency.
Parameters I3 Startup threshold and time are not reported on the table: they do not influence Trip timing, but
only the usage interval of another threshold
For others functions:
Protections
Setting
LC1, LC2
50% I1...100% I1
Iw
0.3In...10In
B2342
Model
Description
No signalling on display and LEDs. All features activated.
Display turned OFF. Protections activated. Warning LED ON
(Blink @0.5Hz)
Display turned OFF. Protections activated. Warning and ALARM LED ON
(Blink @1Hz)
In case of Trip Enable= ENABLE, the CB will istantaneously open.
Description
Determines the presence or absence of the load LC1 threshold.
Determines the presence or absence of the load LC1 threshold.
Determines the presence or absence of the Iw threshold.
Determines the threshold for Iw warning
1
Threshold
Tolerance
Activation into range
1.05...1.3 of I1
± 20%
± 5°
Threshold
Tolerance
± 10%
± 10%
.Iw threshold is expressed as an absolute value.
Time Setting
Time
3s...102s
min: 0.5s.
max: depends by expression
≤ 60ms
Fixed by unit
≤ 60ms
Fixed by unit
Fixed by ABB:
Activation whitin range 10ms...40ms
Apparatus
Doc. no.
Trip
Tolerance
± 20%
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Emax VF
1SDH000909R0001
Scale
Page No
40/66
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