Belarus 3522.5, Operator'S Manual

Page: 319 / 340

3522.5-0000010 OM
320
Table 7.3
а
– Search and elimination of failures in the EHS distribution valve and
EHS electric and hydraulic distribution valve electronic control system
Error
code Cause of suspicion and malfunction
nature
Test and elimination method
15 Control by the joystick or by the
HLL POU can not be executed. It is
possible when actuating PWM-
signal, coming from the joystick (in
the manual control mode) or HLL
POU (in the automated control
mode), is absent or is beyond the
permissible parameter values:
а
) frequency (200±5) Hz;
б
) pulse range (less than 10.5 V);
в
) PWM (5.7-94.3) %.
1. Check:
- the system cables for mechanical
damage;
- pin 3 wires of a jack connector
leading to the distribution valve sec-
tion up to the pins of HLL POU sock-
ets
and joysticks
according to the electrical connec-
tions diagram, shown in Figure
3.16.17, to detect if there is a break-
age;
Figure 7.3.5 – connection of wires to
the socket
Cable jack pin terminals coming to
the distribution valve section:
Pin
№
Designation
1 + power supply
2 Not used
3 PWM - signal
4 Load
- condition of the distribution sec-
tion socket for pins corrosion;
- joysticks by means of change of
their position (if the failure is only in
one section)
2. Check the distribution valve sec-
tions control directly from the joy-
sticks by connecting the sockets for
coupling with HLL POU unit. If the er-
ror code has disappeared HLL POU
unit shall be replaced.
3. In case the special-purpose test-
ing devices are available, test the
signal data
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