ABB ACS880-17 - Pt100 Relays (Options +2 L506, +3 L506, +5 L506, +8 L506)

48 Operation principle and hardware description
 Pt100 relays (options +2L506, +3L506, +5L506, +8L506)
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.
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 option +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 ATEX-certified motor thermal protection
functions for cabinet-built ACS880 drives (options +L513+Q971 and +L514+Q971) user’s
manual (3AXD50000014979 [English]).
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])
• Wiring the Pt100 relays (option +nL506) on page 101 or Wiring the Pt100 relays
(option +nL514) on page 102
• Pt100 relay alarm and trip limit setting instructions on page 126
• circuit diagrams delivered with the drive for the actual wiring.
 Starter for auxiliary motor fan (options +M600…+M605)
What the option contains
The option provides switched and protected connections for one 3-phase auxiliary motor
fan. Each fan connection is equipped with
• fuses
• a manual motor starter switch with an adjustable current limit
• a contactor controlled by the drive, and
• terminal block X601 for customer connections.