Process Protection - Emotron MSF 2.0 Instruction Manual

St Conel Street Nudgee SPS SP043 Electrical Switchboard Operation and Maintenance Manual (Whelan)
Power Factor Control PFC [341]
During operation, the softstarter continuously monitors the
load of the motor. Particularly when idling or when only
partially loaded, it is sometimes desirable to improve the
power factor. If Power Factor Control (PFC) is selected, the
softstarter reduces the motor voltage when the load is lower.
Power consumption is reduced and the degree of efficiency
improved.
3 4 1
F F
o
Default: oFF
Range: oFF, on
oFF PFC disabled
on PFC enabled.
CAUTION: If Power Factor Control is used, the
EMC Directive will not be complied with.
!
External measures will be necessary to meet
the requirements of the EMC Directive.
Fan continuously on [342]
This menu enables the internal fan to be switched on con-
tinuously. the default setting is for the fan only to run when
the softstarter heatsink is too warm. The lifetime of the fan
is increased by only running it when needed.
3 4 2
o F F
Default: oFF
Range: oFF, on
Fan is controlled by the heatsink tempera-
oFF
ture
on Fan is running continuously.
8.8

Process protection

The MSF 2.0 softstarter is equipped with different functions
for process protection:
[400]-[413] Load monitor
[420] External alarm
[430]-[440] Mains protection
Emotron AB 01-4135-01r1
Q-Pulse Id TMS484
Setting
Power Factor Control PFC
Setting
Fan continuously on
Active 03/12/2013
8.8.1 Load monitor
The MSF 2.0 has a built-in load monitor, which continu-
ously supervises the motor shaft power. This means, the
process can easily be protected both from overload and
underload conditions. The load monitor functionality
includes both alarms and pre-alarms for overload (max
power) and underload (min power). While the max. and
min power alarms can be configured to affect operation
(OFF, Warning, Coast, Stop, Brake), the respective pre-
alarms only give an indication that an over- or underload sit-
uation may be close. The pre-alarm status is available on one
of the programmable relays K1 to K3 if so configured (see
description of the relays, menus [530] to [532] on page 85
for more information)
All load monitor alarms and pre-alarms are configured using
a delay time and an alarm margin. The alarm margin is cho-
sen as a percentage of nominal motor load. A max power
alarm will occur when the actual power exceeds the normal
load plus the max power alarm margin and a min power
alarm will occur when the actual load is lower than the nor-
mal load minus the min power margin. Normal load is the
shaft power needed under normal operation conditions. The
default normal load is considered to be 100% of the nomi-
nal motor power. Depending on the dimensioning of the
motor with respect to the application, this value may need to
be adapted. Normal load can easily be adapted by using the
Autoset function in menu [411]. When an Autoset is per-
formed the actual motor shaft power will be measured and
stored to the Normal load.
A start delay can be configured to avoid faulty alarms due to
initial over- or underload situations at start.
Fig. 52 illustrates the load monitor functionality with an
example of a load curve.
If the operation has been interrupted due to a max or min
power alarm, a manual reset and a new start signal is needed
to continue operation. The reset and the start signal can be
given via control panel, remotely or via serial communica-
tion depending on the control source chosen in menu [200].
Regardless of the chosen control source, it is always possible
to initiate a reset via control panel.
NOTE: A reset via control panel will never start the
motor.
NOTE! The load monitor alarms are disabled during
deceleration.
NOTE: When using the load monitor, check that the
nominal motor power is set properly in menu [212].
Functional description 69
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