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Engineering Guide CDA3000
3 Selection of inverter module
3.2.5 Switching at the
inverter input
The CDA3000 inverter modules must be connected to the mains power
by way of an external mains isolator (e.g. power circuit-breaker, contactor
(AC3), etc.).
The mains isolator must conform to EN 60204-1 or local safety standards.
The mains isolator must not be used to control the inverter module (in jog
mode) - extensive control functions are provided for that purpose.
The inverter module may be connected to the mains every
60 seconds.
Frequent connection will not result in destruction of the input circuit
on the inverter module. The inverter module protects itself by means
of high-resistance through isolation inverter from the mains power.
This is made possible by a special PTC precharge technique.
3.2.6 High-voltage
test/Insulation
test
Every shipped inverter module is tested by means of a high-voltage test
for insulation resistance between the main circuit and the housing or
chassis (1.9 k VDC for 1 s). It is therefore not necessary to monitor the
insulation resistance of the modules.
If the insulation resistance is nonetheless to be tested, the proce-
dure set out below should be followed:
1. The high-voltage test must be performed prior to connection of
the CDA3000 inverter.
2. The inputs and outputs U, V, W, +, -, RB, L1, L2 and L3 must be
shorted.
3. The control inputs (X2, X3) and control outputs must be connec-
ted to PE.
4. The high-voltage test is performed by applying a maximum of
1.9 VDC for 1 second. The voltage is applied between the shor-
ting jumper at point 2. and the shorting jumper at point 3.
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