VAMP 265 - Page 71

Technical description
2 Protection functions
2.8 Thermal overload protection T>
(49)
VM265.EN011
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71
Parameters of the thermal overload stage T> (49)
Parameter
Value
Unit
Description
Note
Status
-
Blocked
Start
Trip
Current status of the stage
F
F
Time
hh:mm:s
s
Estimated time to trip
SCntr
Cumulative start counter
C
TCntr
Cumulative trip counter
C
Force
Off
On
Force flag for status forcing for
test purposes. This is a
common flag for all stages and
output relays, too.
Automatically reset by a 5-
minute timeout.
Set
T
%
Calculated temperature rise.
Trip limit is 100 %.
F
MaxRMS
Arms
Measured current. Highest of
the three phases.
Imax
A
kxIgn. Current corresponding
to the 100 % temperature rise.
k>
xIn
Allowed overload (service
factor)
Set
Alarm
%
Alarm level
Set
tau
min
Thermal time constant
Set
ctau
xtau
Coefficient for cooling time
constant. Default = 1.0
Set
kTamb
xIn
Ambient temperature
corrected max. allowed
continuous current
Imax40
%In
Allowed load at Tamb +40 C.
Default = 100 %.
Set
Imax70
%In
Allowed load at Tamb +70 C.
Set
Tamb
C
Ambient temperature.
Editable Samb=n/a. Default =
+40 C
Set
Samb
n/a
ExtAI1..
.16
Sensor for ambient
temperature
No sensor in use for Tamb
External Analogue input 1...16
Set
For details of setting ranges see chapter 9.3.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on