ABB ACS880-07, Hardware Manual

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+L536, +L537
An alternative to a thermistor relay option is the FPTC-01 (L536) or FPTC-02 (+L537,
also reQ971) 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
(oL513+Q971 and +L514+Q971) user's manual
(3AXD50000014979 [English])
• FPTC-01 thermistor protection module (L536) for ACS880 drives user's manual
(3AXD50000027750 [English])
• FPTC-02 ATEX-certified thermistor protection module, Ex II (2) GD (L537+Q971)
for ACS880 drives user's manual
(3AXD50000027782 [English])
• Wiring the PTC thermistor relay(s) (oL505, +2L505, +L513 and
+2L513) (page 105)
• circuit diagrams delivered with the drive for the actual wiring.
￭ Thermal protection with Pt100 relays (onL506)
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.
The output indication of the auxiliary relays can be wired by the customer for example to
• the main contactor or breaker control circuit of the drive, to open it in case of motor
overtemperature,
• the appropriate digital input of the drive, to trip the drive and generate a fault message
in case of motor overtemperature, or
• an external monitoring circuit.
O3L514 (3 relays), +5L514 (5 relays) and +8L514 (8 relays) are ATEX-certified
thermal protection functions that have the same external connectivity as +nL506. In addition,
each monitoring relay has a 0/4…20 mA output that is available on the terminal block. Option
+nL514 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. As the monitoring relay does not have a reset functionality, the
52 Operation principle and hardware description