UNIFREM v.3.41x
10 May 2017
Page 103 from 180
Name [ID]
Description
Def.
system conditions are Torque, Current or Motor power, but there is also a method of connecting
an external pressure or haul sensor as an overload signal (e.g. crane lift drives).
100%
Load
[844]
Value of the selected load signal Load. signal [843] (page 102) that equals 100% of the
load.
-
-
÷
-
This parameter is used to recalculate the Load [854] (page 22) quantity from physical to p.u. (per
unit).
Load
filter
[851]
First order filter that is used for noise or short peaks suppresion of the selected load signal
Load. signal [843] (page 102).
0,01 s
0,01 s ÷
320,00 s
OPS
Group of parameters number [840]
Electronic Overload Protection System. Setting the parameters of the OPS limit switch that is used to block
the START command for the forward direction (during lift-up).
MENU \ SETTINGS \ FUNCTIONS \ LIFTING FUNCTIONS \ OPS
Name [ID]
Description
Def.
OPS
on/off
[841]
Turning on / off the electronic OPS switch.
OPS deactivates START in positive direction when the drive load rate
exceeds the defined criteria. It also deactivates START when there are a
lot of short commands from the operator, which could bypass the time
filters of the defined deactivation criteria.
Turned off
Turned off
OPS limit switch is turned off.
Turned on
OPS limit switch is turned on.
OPS
mode.
[842]
Turning on/off the overload protection switch modes.
Slow abseil | Test
short commands
□
Autodetect
limits
Overload limits detection mode. Overload switch effect will be blocked at the Start command
and the frequency setpoint. Converter evaluates the drive load and sets the overload limits
for the dynamic and static mode according to the actual values of the quantity Load [854]
(page 22). It is necessary for the drive to operate with autodetection at a maximal allowed
operation load.
□ Only static
mode
Turning off the overload test in dynamic states of the drive (start). Dynamic limit and the filter
are not applied and the overloader takes up only at constant speed.
□ Does not
generate
STOP
Turning off the blocking of START in a positive direction when evaluating the drive overload.
Only the bit "Overload" of the status word OPS status [856] (page 22) is switched.
■ Slow abseil
Turning on the of weight abseil deceleration to 20% of the frequency setpoint after an
overload.
■ Test short
commands
Starting the testing of forbidden control commands. They are short commands for the drive
start and operation that can deceive the overloader function and lift an excessive weight to a
forbidden height. If 5 commands are created in a short period of time, the OPS will switch
whether the limits are overstepped or not.
Time after the
start [852]
Insensitivity period of the OPS after the drive start.
0,01 s
0,01
s
÷
320,00 s
It is used to suppress undesired load overshoots created by the the motor excitation and to
suppress the parking brake effect.
Dynamic
overload [845]
Drive overload limit in dynamic states (when accelerating in a positive
direction).
150,0 %
0,0 % ÷ 1000,0
%
Overload occurs if the quantity Load [854] (page 22) exceeds this value for a period longer
than Dynamic overload period [848] (page 103). This parameter is in the autodetection
mode of the limits set automatically by the converter.
Dynamic
overload
period [848]
Period during which the quantity Load [854] (page 22) has to be higher
than the dynamic overload limit, so the overload switch will switch.
0,10 s
