User manual - POWER SUPPLY TRS-09a
- In the case of the unit being fitted with separable clamps they should be inserted
into appropriate connectors in the unit, even if they are not used for any
connections.
- Unused clamps (marked as n.c.) must not be used for connecting any connecting
cables (e.g. as bridges), because this can cause damage to the equipment or
electric shock.
- If the unit is equipped with housing, covers and sealing packing, protecting
against water intrusion, pay special attention to their correct tightening or clamping.
In the case of any doubt consider using additional preventive measures (covers,
roofing, seals, etc.). Carelessly executed assembly can increase the risk of electric
shock.
- After the installation is completed do not touch the unit’s connections when it is
switched on, because it carries the risk of electrical shock.
Due to possible significant interference in industrial installations appropriate measures
assuring correct operation of the unit must be applied. To avoid the unit of improper
indications keep recommendations listed below.
-
Avoid common (parallel) leading of signal cables and transmission cables together with
power supply cables and cables controlling induction loads (e.g. contactors). Such cables
should cross at a right angle.
-
Contactor coils and induction loads should be equipped with anti-interference protection
systems, e.g. RC-type.
-
Use of screened signal cables is recommended. Signal cable screens should be
connected to the earthing only at one of the ends of the screened cable.
-
In the case of magnetically induced interference the use of twisted couples of signal cables
(so-called “spirals”) is recommended. The spiral (best if shielded) must be used with RS-
485 serial transmission connections.
-
In the case of interference from the power supply side the use of appropriate anti-
interference filters is recommended. Bear in mind that the connection between the filter
and the unit should be as short as possible and the metal housing of the filter must be
connected to the earthing with largest possible surface. The cables connected to the filter
output must not run in parallel with cables with interference (e.g. circuits controlling relays
or contactors).
Connections of power supply voltage and measurement signals are executed using the
screw connections inside of the unit’s housing (Figure 4.2 - 4.4).
Figure 4.2. Method of cable insulation replacing and cable terminals
7
m
ax
.
2
m
m
6-7 mm
