BENSHAW RediStart MX3 Series, User Manual

Page: 116 / 238

108
6 - PARAMETER DESCRIPTION
Motor Overload Cooling Time PFN 32
LCD Display
Range 1.0 – 999.9 minutes (Default 30.0)
Description The Motor Overload Cooling Time parameter is the time to cool from 100% to less than (<) 1%. When the
motor is stopped, the overload content reduces exponentially based on Motor Overload Cooling Time
parameter.
Refer to the following equation:
So, a motor with a set cooling time of 30 minutes (1800 sec) with 100% accumulated OL content cools to
<1% OL content in 30 minutes.
z
NOTE
: Consult motor manufacturer data to determine the correct motor cooling time.
See Also
Independent Starting/Running Overload parameter (PFN28) on page 105.
Motor Running Overload Class parameter (PFN30) on page 106.
Motor Starting Overload Class parameter (PFN29) on page 106.
Motor Overload Hot/Cold Ratio parameter (PFN31) on page 107.
Theory of Operation section 7.1.10, Motor Cooling While Stopped on page 145.
Theory of Operation section 7.1.11, Motor Cooling While Running on page 146.
Motor OL Alarm Level PFN 33
LCD Display
Range
1 – 100%
(Default 90%)
Description
An overload alarm condition is declared when the accumulated motor overload content reaches the
programmed OL Alarm Level. An output relay can be programmed to change state when a motor overload
alarm condition is present to warn of an impending motor overload fault.
See Also Relay Output Configuration parameters (I/O 10-15) on page 112.
Theory of Operation 7.1, Solid State Overload Protection on page 138.
PFN: OL Cool Tim
32
30.0 min
t
e
e CoolingTim
5
* Stopped en Content wh OL Content OL
=
PFN: OL Alarm Lvl
33
90 %