L536, +L537; Thermal Protection With Pt100 Relays (Options +Nl506) - ABB ACS880-07 Hardware Manual

54 Operation principle and hardware description
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
(+L537, also requires +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; FPTC-02 is
Type Examined as a protective device within the scope of the European ATEX 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
•
ATEX-certified motor thermal protection functions for cabinet-built ACS880 drives
(options +L513+Q971 and +L514+Q971) user's manual (3AXD50000014979
[English])
•
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])
•
Wiring the PTC thermistor relay(s) (options +L505, +2L505, +L513 and +2L513)
page 125
•
circuit diagrams delivered with the drive for the actual wiring.

Thermal protection with Pt100 relays (options +nL506)


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.
The standard Pt100 relay options include two (+2L506), three (+3L506), five (+5L506) or
eight (+8L506) relays. The monitoring relays are connected to one to three auxiliary relays
whose outputs are wired at the factory to a terminal block. The sensors are to be
connected by the customer to the same terminal block.
As the temperature rises, the sensor resistance increases linearly. At an adjustable wake-
up level, the monitoring relay de-energizes its output which then trips one of the auxiliary
relays.
on