Motor Thermal Protection (Parameters 9.7 - 9.10) - Honeywell SmartVFD COMPACT User Manual

Hvfdcd1b0003 series; hvfdcd1b0005 series; hvfdcd1b0007 series; hvfdcd1b0010 series; hvfdcd1b0015 series; hvfdcd1b0020 series; hvfdcd1b0030 series; hvfdcd3c0005 series; hvfdcd3c0007 series; hvfdcd3c0010 series; hvfdcd3c0015 series; hvfdcd3c0020
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65

10.8 MOTOR THERMAL PROTECTION (PARAMETERS 9.7 - 9.10)

The motor thermal protection is to protect the motor from overheating. The Honey-
well drive is capable of supplying higher than nominal current to the motor. If the load
requires this high current there is a risk that the motor will be thermally overloaded.
This is the case especially at low frequencies. At low frequencies the cooling effect
of the motor is reduced as well as its capacity. If the motor is equipped with an exter-
nal fan the load reduction at low speeds is small.
The motor thermal protection is based on a calculated model and it uses the output
current of the drive to determine the load on the motor.
The motor thermal protection can be adjusted with parameters. The thermal current
I
specifies the load current above which the motor is overloaded. This current limit
T
is a function of the output frequency.
9.7
10
Parameter Descriptions
Setting
0 = Not used
1 = Ready
2 = Run
3 = Fault
4 = Fault inverted
5 = Alarm
6 = Reversed
7 = At speed
8 = Motor regulator
activated
Table 10.2: Output signals via RO1, RO2 and DO1
CAUTION! The calculated model
does not protect the motor if the
airflow to the motor is reduced by
blocked air intake grill
T
HERMAL PROTECTION OF THE MOTOR
0 = No response
1 = Warning
2 = Fault, stop mode after fault according to parameter 2.3
Signal content
Not in operation
The frequency converter is ready to operate
The frequency converter operates (motor is
running)
A fault trip has occurred
A fault trip has not occurred
An alarm has occurred
The reverse command has been selected
The output frequency has reached the set
reference
One of the limit regulators (e.g. current limit,
voltage limit) is activated
Honeywell
62-0312—02

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