ABB ACS880-07C, Руководство по оборудованию, Страница: 37 / 188

Operation principle and hardware description 37

Pt100 relays (o3L506, +5L506, +8L506)
What the option contains
The standard Pt100 relay option includes 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
The Pt100 relay is used for the 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 Pt100 relay releases at an adjustable
wake-up level and indicates motor overtemperature through its change-over contact.
The Pt100 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.
See also
•
firmware manual for parameter settings
•
Wiring the Pt100 relays (o2L506, +3L506, +5L506 and +8L506) on page 83
•
Pt100 relay alarm and trip limit setting instructions on page 107
•
circuit diagrams delivered with the drive for the actual wiring.
Type designation label
The type designation label includes an IEC rating, appropriate markings, a type
designation and a serial number, which allow identification of each unit. The type
designation label is located on the front cover. An example label is shown below.
No. Description
1 Type designation, see section Type designation key below.
2 Ratings
3 Serial number. The first digit of the serial number refers to the manufacturing plant. The next four
digits refer to the unit’s manufacturing year and week, respectively. The remaining digits complete the
serial number so that there are no two units with the same number.