ABB ACS880-07C, Hardware Manual

Page: 36 / 188

36 Operation principle and hardware description
+G307)
The option provides terminals for connecting external uninterruptible control voltage to the
control unit and control devices when the drive is not powered.
See also
•
Supplying power for the auxiliary circuits on page 63
•
Connecting the external 230 V uninterruptible control voltage (UPS, G307) on
page 81
•
circuit diagrams delivered with drive for the actual wiring.

Additional terminal block X504 (L504)
The standard terminal blocks of the drive control unit are wired to the additional terminal
block at the factory for customer control wiring. The terminals are spring loaded.
Cables accepted by the terminals:
•
solid wire 0.08 to 4 mm
2
(28 to 12 AWG)
•
stranded wire with ferrule 0.14 to 2.5 mm
2
(24 to 14 AWG)
•
stranded wire without ferrule 0.08 to 2.5 mm
2
(28 to 14 AWG).
Stripping length: 10 mm (0.5 in).
Note : The option modules inserted in the slots of the control unit are not wired to the
additional terminal block. The customer must connect the option module control wires
directly to the modules.

Thermistor relays (oL505, +2L505)
The thermistor relay is used for the overtemperature supervision of motors equipped with
PTC thermistors. When the motor temperature rises to the thermistor wake-up level, the
thermistor resistance increases sharply. The relay detects the change and indicates motor
overtemperature through its auxiliary contacts.
L505 provides a thermistor relay and an auxiliary relay and connection terminals
for one measuring circuit (one PTC thermistor) and for one normally open contact. The
relay can be reset by pressing its reset button or the resetting can be wired externally.
2L505 provides two thermistor relays and auxiliary relays and connection
terminals for two measuring circuit (one PTC thermistor in each) and for two normally open
contacts. The relays can be reset locally or from a remote reset switch wired to the relay.
The customer connects PTC sensors to the thermistor relay and the terminals of the
auxiliary relay of the normally open contact, 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 thermistor relay(s) (oL505 and +2L505) on page 82
•
circuit diagrams delivered with the drive for the actual wiring.