R&M Materials Handling VARIABLE SPEED CONTROLS ControlMaster NXT Service Manual User Manual
Page 25
R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
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R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
5.2.4 S6 U/f curve settings in traveling movement application
The effect of stator resistance at low frequencies is compensated for by increasing the U/f-ratio. The U/f curve
settings for the different motors are shown in the following table.
Note:
• Zero Freq Volt[%] = output voltage at 0 Hz given as a percentage of the voltage at the motor’s nominal frequency.
• U/f Mid Volt[%] = output voltage at U/f-curve’s intermediate point, fixed to 10 % of motor nominal frequency, given as a
percentage of the voltage at the motor’s nominal frequency.
Switch S6
U/f curve settings
-1
-2
-3
Zero Freq Volt
[%]
U/f Mid Volt [%]
Motor Type
0
1
0
6
12
MF06LA100
1
0
1
6.5
12
MF06LA100(*)
0
0
0
8
12
MF06LA200
1
1
0
8.5
12
MF06LA200(*)
0
1
1
9
16
MF06MA100
0
0
1
10
14
MF06MA200, MF06MK200
(100/120Hz)
1
0
0
21
24
MF06MK200 (35Hz)
1
1
1
Used in a chain hoist lifting application. See section “Parameters for chain hoist lifting”.
(*) Denotes a boost function that provides extra torque for specific motors driven at low frequencies. The function
can be used when motors cannot otherwise move at low speeds. When the curve number 3 or 6 is selected, the
current limit shall be increased to 150% which is set at factory as standard.
Note: Authorized service personnel are allowed to change the curve number 1 to the curve number 3, and the curve number 4
to the curve number 6.
Note: Before activating the torque boost function, drive a few times on the runway at high speed to flatten the runway. If this
does not help, the boost function can be activated.