56 Main features CG Drives & Automation, 01-5980-01r2
Trip message
The trip message can be viewed in the menu “View Trip
Log” [800], in which the nine most recent trip messages are
stored ([810] to [890]). For every logged trip the date and
time - from real time clock [740] - is displayed, along with
the actual trip message according to the denotations in Table
36, page 132. The cause of the most recent or actual trip is
indicated in menu [810].
To facilitate troubleshooting, data is copied from the
operation and status menu groups [710] - [730] when a trip
occurs. See a list of the stored parameters in Table 37, page
135. The stored parameters and their values are shown
under menus [8X1] “Operation”, [8X2] “Status”, and [8X3]
“Stored Values”. To view the value, go down to menu level 4,
i.e. 8XXX.
7.3.4 Load monitor function
The load monitor menu [410] can be used to protect
machines and processes against mechanical overload and
underload, such as a conveyor belt or screw conveyor
jamming, a belt failure on a fan, or a pump running dry.
The load is determined by estimating the motor shaft power,
while running.
There are two overload alarms, “Max Alarm” and “Max Pre-
Alarm”, and two underload alarms, “Min Alarm” and “Min
Pre-Alarm”. The load monitor function is not active during
stop ramps, jogging or braking. For the start ramp you can
choose to delay the activation of the load monitor by using
start delay, menu [416].
It is common that the minimum and maximum alarms are
set to give a soft or hard trip, while the pre-alarms are used
to give an indication that an over- or underload situation
may be close by displaying a warning message (e.g. “Mon
MinPreAl”).
If the operation has been interrupted due to a load monitor
alarm, a reset and a new start signal is needed to continue
operation. Autoreset for the load monitor alarms can be
activated under menu [254]. For manual reset see “Manual
reset” on page 60.
Load monitor alarm levels
There are two alternative ways to set the load monitor alarm
levels:
1. Manual configuration, in which up to four “Alarm
Levels” are set directly (Fig. 40).
2. “Autoset” configuration, for which the alarm levels are
automatically set, based on “Normal Load”
+ four
“Alarm Margins” (Fig. 41).
Common for both methods is that the resulting alarm levels
are given as a percentage that refers to the nominal motor
power [223] (being 100%). However, the way to set the
levels differs between the two methods:
NOTE: When the trip is reset the trip indication will be
removed from the control panel display, but remains in
the trip message log [800].
NOTE: When using the load monitor, check that the
nominal motor power is set properly in menu [223].
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