HVAC A
PPLICATION
Honeywell
• 34
3.5.3.2
Motor Control Settings
Table 23. Advanced motor settings
Code
Parameter
Min
Max
Unit
Default
ID
Description
M3.1.2.1
Switching frequency
1.5
Varies
kHz
Varies
601
Motor noise can be mini-
mised using a high switch-
ing frequency. Increasing
the switching frequency
reduces the capacity of the
drive. It is recommended to
use a lower frequency when
the motor cable is long in
order to minimize capaci-
tive currents in the cable.
M3.1.2.3 Motor preheat function
0
3
0
1225
0 = Not used
1 = Always in stop state
2 = Controlled by DI
3 = Temperature limit (heat-
sink)
NOTE:
Virtual digital input
can be activated by RTC
M3.1.2.4
Motor preheat temper-
ature limit
-20
80
°C
0
1226
Motor preheat is switched
on when the heatsink tem-
perature goes below this
level (if par. M3.1.2.3 is set
to
Temperature limit
.
If limit is e.g. 10°C feeding
current starts at 10 °C and
stops at 11°C (1-degree
hysteresis).
M3.1.2.5
Motor preheat current
0
0.5*I
L
A
Varies
1227
DC current for pre-heating
of motor and drive in stop
state. Activated by digital
input or by temperature
limit.
Summary of Contents for SmartVFD HVAC MR4
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