Elmo Rietschle 2FC4...-1CB - Manual (Page 53)

Parameters 7
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4.193/4.213 Rel. x-on delay. Unit: s
Relationship to
parameter:
4.194/4.214 Parameter HB:
S. xy
Transfer
status:
2
min: 0 Intrinsic value
(to be en-
tered!)
max: 10000
Def: 0
Specifies the duration of the closing delay.
4.194/4.214 Rel. x off delay Unit: s
Relationship to
parameter:
4.193/4.213 Parameter HB:
S. xy
Transfer
status:
2
min: 0 Intrinsic value
(to be en-
tered!)
max: 10000
Def: 0
Specifies the duration of the turn-off delay.
External error
5.010/5.011 External error 1/2 Unit: Integer
Relationship to
parameter:
4,110 to 4,113 Parameter HB:
S. xy
Transfer
status:
2
min: 0 Intrinsic value
(to be en-
tered!)
max: 4
Def:
5.010: 4
5.011: 0
Selection of source via which an external error can be reported.
0 = not assigned / integrated soft - PLC
1 = digital input 1
2 = digital input 2
3 = digital input 3
4 = digital input 4
When a high signal exists at the selected digital input, the in-
verter switches with the error no. 23/24. External error 1/2.
using the parameter 4,110 to 4,113. DIx inverse, the logic of the
digital input can be inverted.
Motor current limit
This function limits the motor current to a programmed maximum value, after
reaching a parametrised current-time area.
This motor current limit is monitored at the application level and thus limited with
relatively small dynamics. This has to be considered in the selection of this func-
tion.
The maximum value is determined by the parameter "Motor current limit in %"
(5,070). This is expressed in percentage and is based on the rated motor current
from the type plate data "motor current" (33,031).
The maximum current-time area is calculated as the product of the parameter
"motor current limit in s" (5,071) and the constant over current of 50 % of the de-
sired motor current limit.
As soon as this current-time area is exceeded, the motor current is limited by re-
ducing the rotation speed to the limit value. Thus, if the output current of the drive
controller exceeds the motor current (parameter 33,031) multiplied by the set limit
in % (parameter 5,070) for the set time (parameter 5,071), the motor speed is re-
duced until the output current drops below the set limit.
The scaling down is done by a PI controller that works depending on the current
difference.
The entire feature can be disabled by setting the parameter "Motor current limit in
%" to zero (5,070).
7.3.10
7.3.11