HI 800 101 HIMatrix Engineering Manual
8 Commissioning, Maintenance, Repairs
This chapter must be read carefully before doing any commissioning, maintenance, modifi-
cations and repairs in order not to affect or endanger the safety of HIMatrix systems and
their functions.
Only personnel who have the knowledge of ESD protective measures are permitted to carry
out system modifications/upgrades to the system wiring.
An electrostatic discharge can damage the built-in elec-
tronic components.
• Touch an earthed object to discharge any static in your body.
• When carrying out the work, make sure to use an ESD protected working area and
wear an earthing strip.
• When the module is not in use, ensure it is protected from electrostatic discharges,
e. g. keep it in its packaging.
8.1 Testing the Inputs and Outputs for Interference Voltage
and Earth Faults
Inadmissible interference voltage can be measured with a universal tester. We recommend
testing every single terminal for unapproved interference voltage.
When testing the external cables for insulation resistance, short-circuit and line break the
cables may not be connected at both ends to prevent defects or destruction of the HIMatrix
devices caused by excessive voltages.
Earth faults are tested before connecting the field cable to the devices. The feed voltage to
the sensors and from the negative pole to the actuators must be disconnected. If the nega-
tive pole is earthed during operation, the earth connection must be disconnected while test-
ing for earth faults. This also applies for the earth connection of an existing earth fault tester.
Every terminal can only be tested against earth with a resistance tester or a similar test in-
strument.
In this status of the system only testing the insulation of single or a group of wires against
earth is admissible, but not two wires mutual each other. Otherwise defects may occur.
A test with high voltage is also not admissible.
The guideline for measuring circuit voltage and the insulation resistance is EN 50178
(VDE 0160).
8.2 Modifications
Great care must be taken when handling plug connectors with compact devices and mod-
ules of the HIMatrix systems.
When pulling out or plugging in the connectors the undefin-
able I/O signals of the controller can trigger unexpected re-
sponses in the system and endanger the safety functions.
We strongly recommend switching off the power supply at
all times when working on the system.
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