+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 ATEX-certified motor thermal protection functions for cabinet-built ACS880 drives
(options +L513+Q971 and +L514+Q971) user's manual (3AXD50000014979 [English]).
Options +2L505 and +2L513 duplicate options +L505 and +L513 respectively, containing
the relays and connections for two separate measurement circuits.
+L536, +L537
An alternative to a thermistor relay option is the FPTC-01 (option +L536) or FPTC-02
(option +L537, also requires option +Q971) thermistor protection module. The module
mounts onto the inverter control unit, and has reinforced insulation to keep the control
unit PELV-compatible. The connectivity of the FPTC-01 and the FPTC-02 is the same,
but the FPTC-02 is Type Examined as a protective device within the scope of the
European ATEX (and UKEX) Product Directive.
For protection purposes, the FPTC has a "fault" input for the PTC sensor. An
overtemperature situation executes the SIL/PL-capable SMT (Safe motor temperature)
safety function by activating the Safe torque off function of the drive.
The FPTC also has a "warning" input for the sensor. When the module detects
overtemperature through this input, it sends a warning indication to the drive.
For more information and wiring examples, see the module manuals and the circuit
diagrams delivered with the drive.
See also
• firmware manual for parameter settings
• FPTC-01 thermistor protection module (option +L536) for ACS880 drives user's
manual (3AXD50000027750 [English])
• FPTC-02 ATEX-certified thermistor protection module, Ex II (2) GD (option
+L537+Q971) for ACS880 drives user's manual (3AXD50000027782 [English])
• circuit diagrams delivered with the drive for the actual wiring.
￭
Thermal protection with Pt100 relays (options +nL506, +nL514)
Pt100 temperature monitoring relays are used for overtemperature supervision of
motors equipped with Pt100 sensors. For example, there can be three sensors to
measure the temperature of the motor windings and two sensors for the bearings.
As the temperature rises, the sensor resistance increases linearly. At an adjustable
wake-up level, the monitoring relay de-energizes its output.
58 Operation principle and hardware description
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