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42 Operation principle and hardware description
of nuisance DC overvoltage tripping due to disturbances caused by probable high-voltage
THD in the supply voltage.
Short-circuit ratio is defined as the supply network's apparent short-circuit power S
divided by the drive's nominal apparent power S
Bottom cable entry/exit (options +H350 and +H352)
￭
For UL Listed (+C129) units, the default input and output cabling direction is through the
roof of the cabinet. The bottom entry (+H350) and bottom exit (+H352) options provide
power and control cable entries at the floor of the cabinet. The entries are equipped with
grommets and 360° grounding hardware.
For non-UL Listed units, bottom entry/exit is the default cabling arrangement.
Top cable entry/exit (options +H351 and +H353)
￭
The top entry (+H351) and top exit (+H353) options provide power and control cable entries
at the roof of the cabinet. The entries are equipped with grommets and 360° grounding
hardware.
Common motor terminal cubicle (option +H359)
￭
As standard, each inverter module must be individually cabled to the motor. This option
provides an additional cubicle containing a single set of terminals for the motor cables.
The width of the cubicle and the size of the terminals within depend on the power rating of
the drive.
Thermal protection with PTC relays (options +L505, +2L505, +L513,
￭
+2L513, +L536, +L537)
PTC thermistor relay options are used for overtemperature supervision of motors equipped
with PTC sensors. When the motor temperature rises to the thermistor wake-up level, the
resistance of the sensor increases sharply. The relay detects the change and indicates
motor overtemperature through its contacts.
+L505, +2L505, +L513, +2L513
Option +L505 provides a thermistor relay and a terminal block. The terminal block has
connections for the measuring circuit (one to three PTC sensors in series), an output
indication of the relay, and an optional external reset button. The relay can be reset either
locally or externally, or the reset circuit can be jumpered for automatic reset.
By default, the thermistor relay is wired internally to digital input DI6 of the drive control unit.
The loss of the input is set to trigger an external fault.
The output indication on the terminal block can be wired by the customer, for example, to
an external monitoring circuit. See the circuit diagrams delivered with the drive.
Option +L513 is an ATEX-certified thermal protection function that has the same external
connectivity as +L505. In addition, +L513 comes with +Q971 (ATEX-certified safe
disconnection function) as standard and is wired at the factory to activate the Safe torque
off function of the drive in an overtemperature situation. A manual reset for the protection
function is required by Ex/ATEX regulations. For more information, see
thermal protection functions for cabinet-built ACS880 drives (options +L513+Q971 and
+L514+Q971) user's manual (3AXD50000014979
Options +2L505 and +2L513 duplicate options +L505 and +L513 respectively, containing
the relays and connections for two separate measurement circuits.
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