L536, +L537; Thermal Protection With Pt100 Relays (Options +Nl506, +Nl514) - ABB ACS880-37LC-0390A-7 Hardware Manual

Industrial drives

Table of Contents

+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.

￭

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.

The standard Pt100 relay options include three (+3L506), five (+5L506) or eight (+8L506)

relays.

By default, the relays are wired internally to digital input DI6 of the drive control unit. The

loss of the input is set to trigger an external fault. The options include a terminal block for

sensor connection. 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.

Options +3L514 (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

manual reset required by Ex/ATEX regulations must be implemented using drive parameters.

For more information, see

ACS880 drives (options +L513+Q971 and +L514+Q971) user's manual (3AXD50000014979

[English]).