maxon motor
1-Q-EC Amplifier DEC 50/5
Operating Instructions
5 Inputs and Outputs
5.1 Inputs
5.1.1 Set value “Speed”
The analogue set value is predetermined at the “Speed” input.
The set value input is used for the following operating modes: speed control,
current control and open loop speed control.
The “Speed” input is protected against overvoltage.
Input voltage range
0 ... +5 V (ref: Gnd)
Input
impedance
> 1 M
Ω
(in the 0 ... +5 V range)
Continuous overvoltage protection
-50 ... +50 V
Use of external potentiometer
When using an external potentiometer, the AUX output (switch
S1
AUX ON)
can be used as +5 V reference.
Recommended resistance value of potentiometer: 10 k
Ω
Note
0 V equals the minimum speed (see
chapter 7, “Speed Ranges”
)
5.1.2 “/Disable”
Disabling or blocking the power stage.
If the input is not wired or the applied voltage is greater than 2.4 V, the amplifier
is activated. A speed ramp will be performed during acceleration.
If the input is placed at Gnd-potential or the applied voltage is lower than 0.8 V,
the power stage is blocked and the motor shaft freewheels and slows down.
The “/Disable” input is protected against overvoltage.
Input voltage range
0 ... +5 V
Input
impedance
33 k
Ω
pull-up resistor at +5 V
Continuous overvoltage protection
-50 ... +50 V
Delay time
approx. 12 ms
“/Disable” active
Input open or
input voltage > 2.4 V
“/Disable” inactive
Set input to Gnd or
input voltage < 0.8 V
Note
If the switch adjuster was changed, the new settings are adopted through a
disable-enable procedure.
8
maxon motor control
October 2008 Edition / Doc.No. 544910-06 / subject to change
