7.6 Control terminals
BU 0750 GB Technical design subject to change 105
Setting value / Description / Notes
Control terminals 1/2: The settings 3 to 5 and 11 imply a hysteresis of 10%, in other words the relay
contact will close (open, if function 11 is activated) when the limit value is reached and open (close, if
function 11 is activated) when the value has dropped below a level which is lower by 10%. The relay
action can be inverted by setting a negative value in parameter P435.
Relay contact ...
at limit value
or with function
(see also P435)
1 = External brake, to control a mechanical brake on the motor. The relay
will make or break at the programmed absolute minimum frequency
(P505). It is advisable to provide a setpoint delay of 0.2...0.3 seconds
(see also P107) for typical brakes.
Mechanical brakes are allowed to be switched directly if connected to
an a.c. supply. (Please take the technical specifications of the relay con-
tacts into due account.)
2 = Inverter is working, the closed relay contact signals that voltage is be-
ing supplied at the inverter output (U - V - W).
3 = Current limit, depends on the value of the nominal motor current set in
P203. The scaling parameter (P435) can be used to adjust this value.
4 = Torque current limit, is based on the motor data set in P203 and P206.
The relay drops out when there is a corresponding torque load on the
motor. This value can be adjusted by scaling (P435).
5 = Frequency limit, is related to the nominal motor frequency set in P201.
This value can be adjusted by scaling (P435).
6 = Level with setpoint, the moment the relay makes the contact it indi-
cates that the FI has terminated the increase or the reduction of the fre-
quency. Setpoint frequency = actual frequency! As soon as the actual
value starts to vary from the setpoint again by at least 1Hz, the realy will
break the contact signalling that
the actual value is no longer equal to
the setpoint.
7 = Fault, basic operating failure, fault is active or has not been acknowl-
edged yet.
ready for operation – relay makes contact
8 = Warning, overall warning, a limit value has been reached, bringing
about a condition which could eventually result in a disconnection of the
inverter.
9 = Overcurrent warning: the current has been at least 130% of the rated
FI current for 30 seconds.
10 = Warn. overtemp. mot.: The motor temperature is evaluated via a digital
input. If the motor is too hot, a warning is put out instantly. Discon-
nection for overtemperature after 30 seconds.
11 = Torque current limit: The limit value in P112 or P536 has been
reached. With a negative value in P435 relay action is inverted. Hys-
teresis = 10%.
12 = Value of P541: The relay can be controlled via the parameter P541 (bit
0) irrespective of the current operating status of the frequency inverter.
13 = Torq. curr. limit gen: The limit value set in P112 was reached in the
regenerative operating range. Hysteresis = 10%.
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