j)
Pre-stress the transducer by turning both screws M4 by one revolution. Do so by
turning the upper screw half a revolution, the lower a full and the upper a further half
of a revolution.
k) For the second transducer, repeat steps b trough j.
Checking continuity and the relevant insulation resistance of the
transducers
Prerequisites:
The balancer is completely assembled and power is switched on. The test rotor, but not a
wheel, may be clamped to the main shaft.
1. Put service code C75 (JBC 8500 F64) into action.
2. With the
b9000
,
b9450
and
b9460
press the minus key to select the source AdE 2. "AdE
2" is read out for one second, then the voltage difference between the outputs of the
unbalance signal amplifiers N4A and N4B is indicated. AdE 2 is the channel indicating
the signal of transducer B3 located in the front.
Normally, the readings are fluctuating around ± 0.005x volts.
3. Standing in front of the balancer, push at the end of the main shaft repeatedly by hand and
observe the readings.
(Pushing at the flange will put inadequate force on the front transducer, since this plane is
the pivot axis of the force guidance structure.)
If there is no effect on the readings, the transducer is not connected properly.
If the two wires are connected in the order intended, there is a minus sign as long you
press. Pushing by hand, readings of 0.5xxx volts are easily obtained.
4. In order to assess the relevant insulation resistance; do not touch the machine, just read the
indicated voltage.
With the transducer in the humid for several days, the insulation resistance can decline to
less than 500 Meg Ohms. Insulation resistance of 500 Meg Ohms will produce 0.14 volts
at the input of the analogue to digital converter.
5. Press the minus key (JBC 8500 the F key) to select channel "AdE 1", transducer B2 in the
rear is connected to, and repeat steps 3 and 4.
The Temperature sensor
The signal from temperature sensor B1 is used to compensate for the temperature-dependant
force to charge conversion of the unbalance transducers.
The temperature sensor is fixed to the vibratory plate by a u-shaped spring (
Snap-on
P/N
EAS2025D12A, HOFMANN Mat-Nr. 1628090). Electrical connection to the Controller board
is via the AWG 28 ribbon cable harness and connector X3.
With a disconnected or defective temperature sensor, the balancer will stay operational except
for temperature correction of the unbalance amount reading. The actual temperature will be
substituted by temperature value determined during calibration.
Indication of current temperature and the voltage at connector X3 pin 13 is with service code
C57. Is service code C57 not available, use service code C75. Select "Ad3" to get the
temperature dependant voltage. At 24 °C there are about 1.3 volts.
Seite 18 von 99
Summary of Contents for Snap-on Y2k
Page 1: ...SERVICE of the Y2k balancing platform Seite 1 von 99 ...
Page 2: ...The vibratory assemblies of the Y2k balancing platform L R L R S S M Seite 2 von 99 ...
Page 32: ......
Page 35: ...Seite 35 von 99 ...
Page 66: ...Seite 66 von 99 Figure 1 JBEG B9000 B9450 User Interface ...
Page 67: ...Seite 67 von 99 Figure 2 JBEG B9460 User Interface ...
