Terminal THR is normally used as an external
trip. In addition, Function 57 permits the use
of this external circuit to give increased data
security in conjunction with Function 00 as
shown in the table below. The circuit could,
for example, be equipped with a key-switch
contact.
Setting range
0 = THR (external trip circuit) function
1 = Additional data protection function
The relationship of Function 57 and Function
00 is shown in the table below.
When Function 57 = 1:
THR- Function Data
P24 00 adjustable?
OPEN = 0 NO
OPEN = 1 NO
CLOSED = 0 YES
CLOSED = 1 NO
Up to 3 frequencies can be set so that during
acceleration and deceleration the inverter out-
put jumps from one level to another to avoid
any frequencies that give rise to mechanical
resonance. The hysteresis bandwidth is the
same for all. The skip frequencies are at the
mid-point of the hysteresis band.
Setting ranges
Hysteresis: 0Hz to 30Hz
in steps of 1Hz
Skip frequencies: 0Hz to 400Hz
in steps of 1Hz
Factory-set defaults are:
hysteresis 3Hz, skip frequencies 0Hz.
NOTE Skip frequency 1 may be lower or
higher than skip frequency 2 and/or 3.
Values need not correspond to the numeri-
cal sequence.
37
57 Terminal THR function
58 Skip frequency hysteresis
59 Skip frequency 1
60 Skip frequency 2
61 Skip frequency 3
Output
Hz
t
Function 59
Function 58
Function 60
Function 61
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