M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation

Protective Functions, continued
PNU ID
Access
RUN Value/Range Description
P8.4 709 X — Stall protection
The stall protection function is an overload protection.
It protects the motor from brief overloads (for example, blocked
motor shaft) and is set via parameter P7.2
Note: With long motor cable lengths and low motor power
1
(poor efficiency cos ), a higher (capacitive) motor current can
0
flow causing early tripping. Solution: Motor reactor or sinus filter
Deactivated
1 Alarm (AL 15)
2 Fault (F… 15), stop function according to P6.8
P8.5 713 X — Underload protection
The underload protection monitors the load of the connected
motor in the range of 5 Hz up to the maximum output
frequency. This requires that the output current of the
frequency inverter be monitored. A message will be generated
if the values set in P8.12 and P8.13 are undershot within
20 seconds
0
0 Deactivated
1 Alarm (AL 17)
2 Fault (F…17), stop function according to P6.8
P8.6 704 X — Motor, temperature protection
The motor temperature protection is designed to protect the
motor from overheating. It is based on a temperature algorithm
and uses the motor current (P7.1) to determine the motor load
(see figure on Page 90)
2
0 Deactivated
1 Alarm (AL 16)
2 Fault (F… 16), stop function according to P6.8
P8.7 705 X — Motor, ambient temperature 40
–20° to 100°C —
P8.8 706 X — Motor, cooling factor at zero frequency 40.0
0.0–150% The cooling factor of the motor with a zero frequency defines
the relationship to the cooling of the motor at the rated
frequency with the rated operational current without an external
fan (see figure on Page 90)
P8.9 707 X — Motor, thermal time constant 45
1–200 min The temperature time constant determines the time-span in
which the heat calculation model achieves 63% of its end value.
It depends on the design of the motor and is different from
manufacturer to manufacturer. The larger the motor design,
the greater the time constant
Parameters
Factory Setting
(P1.3)
M-Max Series Adjustable Frequency Drive MN04020003E—April 2011 www.eaton.com 89