KEB COMBIVERT F5 Reference Manual page 142

LM - Motor Data Parameters
LM02
Motor Speed
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142
The rated motor speed in rpm, according to nameplate.
For an Induction Motor you may NOT enter the motor-synchronous speed
(e.g. 1200 rpm for a 6 pole, 60Hz motor) Rated Motor Speed = Synchronous
Speed - Slip Speed. Ask the motor manufacturer for the motor rated speed.
When the following synchronous speeds are entered, a warning message
will be displayed to the user, "Warning: Value entered appears to be
synchronous motor speed; for an induction motor the rated motor speed
will be less due to slip!"
60 Hz, 6-pole: 1200 rpm
60 Hz, 4-pole: 1800 rpm
60 Hz, 2-pole: 3600 rpm
50 Hz, 6-pole: 1000 rpm
50 Hz, 4-pole: 1500 rpm
50 Hz, 2-pole: 3000 rpm
If you cannot find it on the name plate, use the following example to estimate
the rated speed.
Example:
If the nameplate reads 1200 rpm (synchronous speed) then the value
that should be entered must be lower. For starting purposes, one can
i
estimate the slip at about 2.9%. Then through running the elevator it is
possible to determine whether further adjustments are necessary. 2.9%
of 1200 is 35 rpm. To begin with, use the value 1200 - 35 = 1165 rpm which
is the default value.
Valid Adjustment Range for 60Hz motors:
From this parameter along with the LM04 Motor Frequency, the F5 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.
The following shows the valid adjustment range of 60Hz motors.
For PM Synchronous Motors, the relationship between the rated motor speed,
rated motor frequency and the number of motor poles MUST NOT include
any slip.
• 4 poles: 1201...1799 rpm
• 6 poles: 901.....1199 rpm
• 8 poles: 721.... ..899 rpm
• 10 poles: 601.... ..719 rpm