TECO F33 Series, Инструкция по эксплуатации, Страница: 74 / 192

Functional Description 71
Encoder Feedback [22B]
Only visible if the Encoder option board is installed. This
parameter enables or disables the encoder feedback
from the motor to the VSD.
Communication information
Encoder Pulses [22C]
Only visible if the Encoder option board is installed. This
parameter describes the number of pulses per rotation
for your encoder, i.e. it is encoder specific. For more
information please see the encoder manual.
Communication information
Encoder Speed [22D]
Only visible if the Encoder option board is installed. This
parameter shows the measured motor speed. To check
if the encoder is correctly installed, set Encoder [23B]
to Off, run the VSD at any speed and compare with the
value in this menu. The value in this menu [22D]
should be about the same as the motor speed [712]. If
you get the wrong sign for the value, swap encoder
input A and B.
Communication information
11.2.5 Motor Protection [230]
This function protects the motor against overload
based on the standard IEC 60947-4-2.
Motor I
2
t Type [231]
The motor protection function makes it possible to pro-
tect the motor from overload as published in the stand-
ard IEC 60947-4-2. It does this using Motor I2t Current,
[232] as a reference. The Motor I2t Time [233] is used
to define the time behaviour of the function. The cur-
rent set in [232] can be delivered infinite in time. If for
instance in [233] a time of 1000 s is chosen the upper
curve of Fig. 72 is valid. The value on the x-axis is the
multiple of the current chosen in [232]. The time [233]
is the time that an overloaded motor is switched off or
is reduced in power at 1.2 times the current set in
[232]
.
Communication information
NOTE: At switching frequencies >3 kHz derating may
become necessary. If the heat sink temperature gets too
high the switching frequency is decreased to avoid
tripping. This is done automatically in the VSD. The
default switching frequency is 3 kHz.
Default: Off
On 0 Encoder feedback enabled
Off 1 Encoder feedback disabled
Modbus Instance no/DeviceNet no: 43051
Profibus slot/index 168/210
Fieldbus format UInt
Modbus format UInt
Default: 1024
Range: 5–16384
Modbus Instance no/DeviceNet no: 43052
Profibus slot/index 168/211
Fieldbus format Long, 1=1 pulse
Modbus format EInt
22B Encoder
Stp M1: Off
A
22C Enc Pulses
Stp M1: 1024
A
Unit: rpm
Resolution: speed measured via the encoder
Modbus Instance no/DeviceNet no: 42911
Profibus slot/index 168/70
Fieldbus format Int
Modbus format Int
Default: Trip
Off 0 I
2
t motor protection is not active.
Trip 1
When the I
2
t time is exceeded, the VSD will
trip on “Motor I
2
t”.
Limit 2
This mode helps to keep the inverter run-
ning when the Motor I2t function is just
before tripping the VSD. The trip is
replaced by current limiting with a maxi-
mum current level set by the value out of
the menu [232]. In this way, if the reduced
current can drive the load, the VSD contin-
ues running.
Modbus Instance no/DeviceNet no: 43061
22D Enc Speed
Stp M1: XXrpm
A
231 Mot I
2
t Type
Stp M1: Trip
A