ABB ACH550-01 User Manual page 267

To fulfil this requirement, connect a thermistor (and other similar
components) to the drive's control terminals using any of these
alternatives:
• Separate the thermistor from live parts of the motor with
double reinforced insulation.
• Protect all circuits connected to the drive's digital and
analogue inputs. Protect against contact, and insulate from
other low voltage circuits with basic insulation (rated for the
same voltage level as the drive's main circuit).
• Use an external thermistor relay. The relay insulation must be
rated for the same voltage level as the drive's main circuit.
The figures below show thermistor relay and PTC sensor
connections using a digital input. At the motor end, the cable
shield should be grounded through, eg. a 3.3 nF capacitor. If this
is not possible, leave the shield unconnected.
3501
SENSOR TYPE
3501
SENSOR TYPE
For other faults, or for anticipating motor overheating using a
model, see
262
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
= 5 ( (0)) or 6 (
THERM
Thermistor
relay
T
Motor
= 5 ( (0)) – PTC sensor
THERM
T
3.3 nF
Motor
Group 30: FAULT
ACH550-01 User's Manual
(1)) – Thermistor relay
THERM
Control board
DI
+24 V DC
Control board
DI
+24 V DC
FUNCTIONS.
Parameter listing and descriptions