Rated Motor Speed - KEB COMBIVERT F5 Instruction Manual

Parameter Description - Motor Data

Rated Motor Speed

LF.11 Valid Adjustment Range
for 60Hz motors
Recommend values for LF.11
when using modern 6 pole 60Hz,
elevator motors
62
Unit:
IM
Value range :
Factory setting:
Adjustment value:
You may not enter the motor-synchronous speed
(e.g. 1800 rpm for a 4 pole motor, 1200 rpm for a 6
pole motor, and 900 rpm for a 8 pole motor). Ask
the manufacturer for the motor rated speed if you
cannot find it on the name plate or use the follow-
ing example to estimate the rated speed.
Example: If the name plate reads 1200 rpm (synchronous
speed) then the value that should be entered must be
lower. For starting purposes, one can estimate the
slip at about 2.9%. Then through running the elevator
it is possible to determine whether further adjust-
ments are necessary. 2.9% of 1200 is 35 rpm. So for
starting, use the value 1200 - 35 = 1165 rpm which is
the default value.
From this parameter along with the rated frequency in LF.13, the
Torqmax Elevator Drive calculates the number of motor poles.
As a result there are limits as
to how low the value can be
adjusted for a motor with a
certain number of poles.
Refer to the table to the right
for the valid adjustment
range of 60Hz motors.
With modern low slip
elevator motors it is often
advantageous to enter a
rated motor speed which is
slightly higher than the
name plate speed. This
results in a lower calculated
slip and in many cases
reduces the motor current
and offers smoother ride
performance.
rpm
10.0....6000.0 or 500.0
(based on config mode)
1165.0 or 150.0
(based on config mode)
in accordance with the motor name plate
4 poles 1201...1799 rpm
6 poles
8 poles
10 poles
Motor Adder
Value
Name Plate
1180
1175
1170
1165
1160
1155
1150
901...1199 rpm
721...899 rpm
601...719 rpm
Value
in LF.11
5
1185
6 1181
8 1178
9 1174
10
1170
11
1166
13 1163