TECO F33 Series, Instruction Manual, Page: 75 / 192

72 Functional Description
Motor I
2
t Current [232]
Sets the current limit for the motor I
2
t protection.
Communication information
Motor I
2
t Time [233]
Sets the time of the I
2
t function. After this time the limit
for the I
2
t is reached if operating with 120% of the I
2
t
current value. Valid when start from 0 rpm.
Communication information
Fig. 72 I
2
t function
Fig. 72 shows how the function integrates the square of
the motor current according to the Mot I
2
t Curr [232]
and the Mot I
2
t Time [233].
Profibus slot/index 168/220
Fieldbus format UInt
Modbus format UInt
NOTE: When Mot I2t Type=Limit, the VSD can control the
speed < MinSpeed to reduce the motor current.
Default: 100% of I
MOT
Range: 0–150% of I
MOT
Modbus Instance no/DeviceNet no: 43062
Profibus slot/index 168/221
Fieldbus format Long, 1=1%
Modbus format EInt
NOTE: When the selection Limit is set in menu [231], the
value must be above the no-load current of the motor.
232 Mot I
2
t Curr
Stp 100%
A
NOTE: Not the time constant of the motor.
Default: 60 s
Range: 60–1200 s
Modbus Instance no/DeviceNet no: 43063
Profibus slot/index 168/222
Fieldbus format Long, 1=1 s
Modbus format EInt
233 Mot I
2
t Time
Stp M1: 60 s
A
10
100
1000
10000
100000
1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2
t [s]
i / I2t-current
60 s (120%)
120 s (120%)
240 s (120%)
480 s (120%)
1000 s (120%)
Actual output current/ I
2
t-current