CARLO GAVAZZI MF1C, User Manual

Page: 10 / 20

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•Once wiring is completed, with
the correct connection of the
input terminals Z1, Z2, Z3
according to the type of motor,
the module internal relays must
be activated with the motor
stopped. The two CH1, CH2
channel led must switch on and
signal the switching of the two
safety contacts. In this situation
the safety outputs are closed.
•The module allows the switching
threshold to be set for each of
the internal measurement chan-
nels. With the trimmers set at the
most sensitive level the safety
outputs are closed when the
voltage on the motor phases is
around 200 mVpp (70 mVrms).
With the trimmers set at the less
sensitive level the safety outputs
are closed when the voltage on
the motor phases is around 800
mVpp (280 mVrms). It is advis-
able to initially set both trimmers
at the minimum sensitive thresh-
old.
•After setting the threshold levels,
it is necessary to start the motor:
the CH1, CH2 channel LED must
switch off and the safety outputs
must be open.
•Carry out a motor braking
manoeuvre: the CH1, CH2 chan-
nel led light up and the safety
outputs close in correspondence
to a certain shaft residual rpm.
Check if the residual rpm is
acceptable and if it isn’t,
increase the sensitivity of the
module on the calibration trim-
mers in the front panel and
repeat the motor start-brake
manoeuvre. Repeat this proce-
dure until a satisfactory situation
is achieved, in terms of residual
rotation and module switching
time.
•Ideally the two CH1, CH2 chan-
nel LED should switch on con-
temporaneously to each other
and with the safety outputs
switching from open to closed.
Nevertheless there can be some
asymmetries in the shape of the
wave in the module phases and
it might be necessary to calibrate
the sensitivity threshold to values
slightly different from each other
(the calibration must be opti-
mised on site).
Warning!
As the residual voltage on the
windings is function of the shaft
angular velocity, the user must
adjust the safety module in corre-
spondence to the voltage thresh-
olds and therefore the angular
velocity, required by the applica-
tion. The user of the module is
responsible for the evaluation of
the risks of the machine and
checking the module calibration,
so that the shaft stopped signal
occurs when the shaft rotation
rpm is not dangerous.
The module can be adapted to dif-
ferent applications by adjusting
the threshold voltage for each of
the two channels with the trim-