Honeywell SmartVFD HVAC MR4, User Manual

Page: 144 / 164

HVAC A
PPLICATION
Honeywell
• 72
Figure 13.
M3.9.2 R
ESPONSE TO EXTERNAL FAULT
An alarm message or a fault action and message is generated by an external fault external fault
signal in one of the programmable digital inputs (DI3 by default) using parameters M3.5.1.7 and
M3.5.1.8. The information can also be programmed into any of the relay outputs.
M3.9.8 M
OTOR THERMAL ZERO SPEED COOLING
Defines the cooling factor at zero speed in relation to the point where the motor is running at
nominal speed without external cooling.
The default value is set assuming that there is no external fan cooling the motor. If an external
fan is used this parameter can be set to 90% (or even higher).
If you change the parameter M3.1.1.4 (Motor nominal current) , this parameter is automatically
restored to the default value.
Setting this parameter does not affect the maximum output current of the drive which is deter-
mined by parameter M3.1.1.7 alone.
The corner frequency for the thermal protection is 70% of the motor nominal frequency
(M3.1.1.2).
Min freq Max freq
Tagged with
OK button
Successful!
Min freq Max freq
Failed!
H W100K30.fh11