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128 Program features
To fulfill the insulation 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 analog 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 figure below shows alternate thermistor connections. At the motor end the cable
shield should be grounded through a 10 nF capacitor. If this is not possible, leave the
shield unconnected.
It is also possible to monitor motor temperature by connecting a PTC sensor and
a thermistor relay between the +24 V DC voltage supply offered by the drive and a
digital input. The figure below displays the connection.
For other faults, or for anticipating motor overheating using a model, see
.
T
Thermistor
relay
MMIO board
DI1…5
+24 V DC
Motor
Par. 3501 = THERM (0) or THERM(1)
Motor
T
10 nF
Thermistor (0)
MMIO board
DI5
+24 VDC
Summary of Contents for ACS320 series
Page 1: ...ABB drives User s manual ACS320 drives 0 5 to 30 hp ...
Page 4: ......
Page 18: ...18 Safety ...
Page 28: ...28 Operation principle and hardware description ...
Page 56: ...56 Electrical installation ...
Page 142: ...142 Program features Connection diagram example ACS320 xx xxxx x ...
Page 282: ...282 Actual signals and parameters ...
Page 358: ...358 Fieldbus control ...
Page 376: ...376 Fault tracing ...
Page 382: ...382 Maintenance and hardware diagnostics ...
Page 407: ...Dimension drawings 407 Frame size R2 NEMA 1 Frame size R2 IP20 NEMA 1 3AUA0000051097 A ...
Page 409: ...Dimension drawings 409 Frame size R3 NEMA 1 Frame size R3 IP20 NEMA 1 3AUA0000051118 A ...
Page 411: ...Dimension drawings 411 Frame size R4 NEMA 1 Frame size R4 IP20 NEMA 1 3AUA0000051133 A ...
Page 412: ...412 Dimension drawings ...
Page 413: ...Index Numerics A B C D E F G H I K L M N O P R S T ...