62
Parameter Descriptions
Honeywell
9
If the motor's t6-time (t6 is the time in seconds the motor can safely operate at
six times the rated current) is known (given by the motor manufacturer) the
time constant parameter can be set basing on it. As a rule of thumb, the motor
thermal time constant in minutes equals to 2xt6. If the drive is in stop state the
time constant is internally increased to three times the set parameter value.
See also Figure 9.12.
Figure 9.12: Motor temperature calculation
9.11
M
OTOR
P
HASE
S
UPERVISION
Motor phase supervision of the motor ensures that the motor phases have an
approximately equal current.
Settings for P9.11, range 0-2:
Activation
Mode
Description
0
No response
1
Warning
2
Fault, stop mode after fault according to ID506 (P2.3 stop func-
tion)
105%
par. 9.7
Q = (I/IT)
2 x (1-e-t/T)
I/I
T
Trip area
Motor temperature
Time
Motor temperature
Time constant T*)
*)
Changes by motor size and
adjusted with parameter 9.10
Fault/warning
Motor
current