72 Functional Description Emotron AB 01-3694-01r2
Fig. 69 I
2
t function
Fig. 69 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].
When the selection Trip is set in menu [231] the VSD trips
if this limit is exceeded.
When the selection Limit is set in menu [231] the VSD
reduces the torque if the integrated value is 95% or closer to
the limit, so that the limit cannot be exceeded.
Example
In Fig. 69 the thick grey line shows the following example.
• Menu [232] Mot I
2
t Curr is set to 100%.
1.2 x 100% = 120%
• Menu [233] Mot I
2
t Time is set to 1000 s.
This means that the VSD will trip or reduce after 1000 s if
the current is 1.2 times of 100% nominal motor current.
Thermal Protection [234]
Only visible if the PTC/PT100 option board is installed. Set
the PTC input for thermal protection of the motor. The
motor thermistors (PTC) must comply with DIN 44081/
44082. Please refer to the manual for the PTC/PT100
option board.
Menu [234] PTC contain functions to enable or disable the
PTC input.
Communication information
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
NOTE: If it is not possible to reduce the current, the VSD
will trip after exceeding 110% of the limit.
Default: Off
Off 0
PTC and PT100 motor protection are disa-
bled.
PTC 1
Enables the PTC protection of the motor
via the insulated option board.
PT100 2
Enables the PT100 protection for the
motor via the insulated option board.
PTC+PT100 3
Enables the PTC protection as well as the
PT100 protection for the motor via the
insulated option board.
Modbus Instance no/DeviceNet no: 43064
Profibus slot/index 168/223
Fieldbus format UInt
Modbus format UInt
NOTE! PTC option and PT100 selections can only be
selected when the option board is mounted.
234 Thermal Prot
Stp Off
A
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