User Guide

Honeywell Parameter Descriptions 67
10
10.7 DIGITAL AND ANALOQUE OUTPUTS (CONTROL PANEL: MENU PAR
-> P7)
7.1 RELAY OUTPUT 1 FUNCTION
7.2 RELAY OUTPUT 2 FUNCTION (ONLY IN API FULL)
7.3 DIGITAL OUTPUT 1 FUNCTION (ONLY IN API FULL)
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
T
specifies the load current above which the motor is overloaded. This current limit
is a function of the output frequency.
CAUTION! The calculated model
does not protect the motor if the
airflow to the motor is reduced by
blocked air intake grill
Setting Signal content
0 = Not used Not in operation
1 = Ready The frequency converter is ready to operate
2 = Run
The frequency converter operates (motor is
running)
3 = Fault A fault trip has occurred
4 = Fault inverted A fault trip has not occurred
5 = Alarm An alarm has occurred
6 = Reversed The reverse command has been selected
7 = At speed
The output frequency has reached the set
reference
8 = Motor regulator
activated
One of the limit regulators (e.g. current limit,
voltage limit) is activated
Table 10.2: Output signals via RO1, RO2 and DO1