ABB ACS880-07XT Series, Hardware Manual, Page: 39 / 168

Operation principle and hardware description 39
See also
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firmware manual for parameter settings
•
Wiring the thermistor relay(s) (oL505 and +2L505) on page 81
•
circuit diagrams delivered with the drive for the actual wiring.
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Pt100 relays (o2L506, +3L506, +5L506, +8L506)
What the option contains
The standard Pt100 relay option includes two (+2L506), three (+3L506), five (+5L506) or
eight (+8L506) Pt100 temperature monitoring relays and an auxiliary relay wired to a
terminal block. Other numbers of Pt100 relays must be ordered as application engineered.
Description
A Pt100 relay is used for overtemperature supervision of motors equipped with Pt100
sensors. For example, three sensors measure the temperature of the motor windings and
two sensors the temperature of the bearings. The sensor resistance increases linearly as
the temperature rises. The relay releases at an adjustable wake-up level and indicates
motor overtemperature through its change-over contact.
The relay provides connection terminals for one Pt100 temperature sensor and terminals
of one normally open and one normally closed contact.
The customer connects Pt100 sensors to the Pt100 relays (one sensor per relay) and the
auxiliary relays of the normally open contacts of the Pt100 relays, for example, to
•
main breaker control circuit of the drive for opening the breaker in case of motor
overtemperature or
•
appropriate digital input of the drive for tripping the drive and generating a fault
message in case of motor overtemperature or
•
customer control circuit.