VAMP 259 - Page 102

2.13 Thermal overload protection T>
(49)
2 Protection functions
Technical description
102
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VM259.EN007
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:ss
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
kxIn. Current corresponding
to the 100 % temperature
rise.
k>
xI
n
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
xI
n
Ambient temperature
corrected max. allowed
continuous current
Imax40
%I
n
Allowed load at Tamb +40
C. Default = 100 %.
Set
Imax70
%I
n
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