maxon motor 1-Q-EC User manual

maxon motor
maxon motor control 1-Q-EC Amplifier DEC 50/5
Order number 230572
Operating Instructions October 2008 Edition
The DEC (Digital EC Controller) is a 1-quadrant amplifier for controlling electronically commutated (brushless)
DC motors.
•Digital speed control
•Maximum speed: 120 000 rpm (motor with 1 pole pair)
•Operates as speed control, current control or open loop
speed control
•/Brake, direction and /disable input
•AUX connection: adjustable function
(+5 V output or input for changing speed)
•Status indicator with red and green LED
•Set value input through built-in potentiometer (several
speed ranges can be selected) or through
analogue set value input (0 ... +5 V)
•Maximum current limit adjustable
•Gain can be adjusted in two stages
•Adjustable speed ramp
•Protection against heat overload
•Blockage protection (current limit for blocked motor)
•Plug-in terminal clamp
Table of Contents
1Safety Instructions..............................................................................................................................................2
2Performance Data ..............................................................................................................................................3
3Minimum External Wiring for Different Modes of Operation...............................................................................4
4Operating Instructions ........................................................................................................................................6
5Inputs and Outputs.............................................................................................................................................8
6Switch Functions ..............................................................................................................................................12
7Speed Ranges..................................................................................................................................................12
8Potentiometer Functions...................................................................................................................................13
9Operating Status Display..................................................................................................................................14
10 Protection .........................................................................................................................................................15
11 EMC-compliant installation...............................................................................................................................15
12 Block Diagram..................................................................................................................................................16
13 Dimension Drawing ..........................................................................................................................................16
The latest edition of these operating instructions may be found in the internet as a PDF-file under
www.maxonmotor.com category “Service & Downloads”, Order number 230572.

maxon motor
1-Q-EC Amplifier DEC 50/5 Operating Instructions
1 Safety Instructions
Skilled Personnel
Only experienced, skilled personnel should install and start the equipment.
Statutory regulations
The user must ensure that the amplifier and the components belonging to it are
assembled and connected according to local statutory regulations.
Load disconnected
For initial operation, the motor should be free running, i.e. with the load
disconnected.
Additional safety equipment
Any electronic apparatus is, in principle, not fail-safe. Machines and apparatus
must therefore be fitted with independent monitoring and safety equipment. If the
equipment breaks down, if it is operated incorrectly, if the control unit breaks
down or if the cables break, etc., it must be ensured that the drive or the complete
apparatus is kept in a safe operating mode.
Repairs
Repairs may only be carried out by authorised personnel or the manufacturer. It is
dangerous for the user to open the unit or carry out any repairs.
Danger
Ensure that no apparatus is connected to the electrical supply during installation
of the DEC 50/5. After switching on, do not touch any live parts!
Max. supply voltage
Make sure that the supply voltage is between 10 and 50 VDC. Voltages higher
than 60 VDC or of wrong polarity will destroy the unit.
Short circuit and earth fault
The amplifier is not protected against:
winding short circuits, winding short circuits against ground safety earth or Gnd!
Electrostatic sensitive device (ESD)
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maxon motor
Operating Instructions 1-Q-EC Amplifier DEC 50/5
2 Performance Data
2.1 Electrical data
Supply voltage VCC (Ripple < 5 %)..............................................................................10 - 50 VDC
Max. output voltage........................................................................................................ 0.95 · VCC
Continuous output current Icont ..................................................................................................5 A
Max. output current Imax...........................................................................................................10 A
Switching frequency............................................................................................................39 kHz
Max. speed (motor with 1 pole pair)...........................................................................120 000 rpm
2.2 Inputs Speed .....................................................................................................analogue input (0 ... 5 V)
Resolution: 1024 steps
/Disable............................................................................TTL, CMOS (5V) or switch against Gnd
Direction.........................................................................TTL, CMOS (5V) ) or switch against Gnd
/Brake ............................................................................TTL, CMOS (5V) ) or switch against Gnd
Hall sensor...........................................................................................................................1, 2, 3
2.3 Inputs / outputs
AUX (configurable).............................................................................digital input / +5 VDC output
2.4 Voltage outputs
Hall sensors supply voltage VCC Hall .....................................................7 ... 12 VDC, max. 30 mA
2.5 Motor connections
Motor winding 1
Motor winding 2
Motor winding 3
2.6 Trim potentiometers
Speed 1, Speed 2 / Ramp, Imax, gain
2.7 LED indicator
Operating indicator: green LED
Error indicator: red LED
2.8 Ambient temperature / humidity range
Operation...................................................................................................................-10 ... +45°C
Storage ......................................................................................................................-40 ... +85°C
No condensation...........................................................................................................20 ... 80 %
2.9 Protective functions
Heat monitoring of power stage.....................................................................................T > 100°C
Blockage protection .................. Motor current limit, if motor shaft is blocked for longer than 1.5 s
2.10 Mechanical data
Weight...................................................................................................................... approx. 155 g
Dimensions (L x W x H) ..........................................................see dimension drawing, chapter 13
Mounting plate ......................................................................................................for 4 screws M3
Mounting hole separation............................................................................................ 87 x 39 mm
2.11 Terminals PCB clamps (plug-in terminal clamps)..............................................................................15 poles
Pitch.............................................................................................................................3.5 mm
suitable for wire cross section ..... 0.14...1mm2multiple-stranded or 0.14...1.3mm2single wire
AWG 16-26
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maxon motor
1-Q-EC Amplifier DEC 50/5 Operating Instructions
3 Minimum External Wiring for Different Modes of Operation
3.1 Speed control
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maxon motor
Operating Instructions 1-Q-EC Amplifier DEC 50/5
3.2 Current control and open loop speed control
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maxon motor
1-Q-EC Amplifier DEC 50/5 Operating Instructions
4 Operating Instructions
4.1 Power supply layout
Any available power supply can be used, as long as it meets the minimum re-
quirements set out below.
During set up and adjustment phases, we recommend separating the motor
mechanically from the machine to prevent damage from uncontrolled motion.
Power supply requirements
Output voltage VCC min. 10 VDC; VCC max. 50 VDC
Ripple < 5 %
Output current depending on load,
continuous max. 5 A
acceleration, short-time max. 10 A
The required voltage can be calculated as follows:
Known values
ÖOperating torque MB[mNm]
ÖOperating speed nB[rpm]
ÖNominal motor voltage UN [V]
ÖMotor no-load speed at UN, n0[rpm]
ÖSpeed/torque gradient of motor ∆n/∆M [rpm/mNm]
Sought values
ÖSupply voltage VCC [V]
Solution
VM
M
n
n
n
U
VBB
N
CC 1
95.01
)(
0
+⋅⋅
∆
∆
+⋅=
Choose a power supply capable of supplying this calculated voltage under load.
The formula takes into account a max. PWM cycle of 95 % and a 1 volt max.
voltage drop at DEC 50/5.
Note
Please note chapter 5.1.5, “/Brake” function when using the “/brake” input!
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maxon motor
Operating Instructions 1-Q-EC Amplifier DEC 50/5
4.2 Adjusting the potentiometers
4.2.1 Pre-adjustment With the pre-adjustment, the potentiometers are set in a preferred position.
DEC units in the original packing are already pre-set.
P1Speed1
P2Speed2/Ramp
P3I
max
Pre-adjustment of potentiometers
P1 Speed 1 50 %
P2 Speed 2 / Ramp 50 %
P3 Imax 50 %
Note
Left end stop of potentiometers: Minimum value
Right end stop of potentiometers: Maximum value
4.2.2 Adjustment
Digital speed control 1. Depending on operating mode selected, predetermine set value so that
required speed is reached. If necessary, adjust max. speed with switch
S5 and S6 (see chapter 7, “Speed Ranges”).
2.
Adjust potentiometer P3 Imax to required limiting value.
Maximum current in the 0 … 10 A range can be adjusted in linear fashion
with potentiometer P3.
3. Adjust switch S2 gain to required amplification
(S2 OFF: gain high, S2 ON: gain low)
Important: If the motor is unsteady, vibrates or makes noises, the se-
lected amplification is too high. Switch S2 must be set at ON.
Digital current control 1. Adjust potentiometer P1 Speed 1 to required speed limit. Maximum
speed in the 500 ... 25 000 rpm range (motor with 1 pole pair) can be
adjusted in linear fashion with potentiometer P1, and is independent of
the position of the switches S5 and S6 (see chapter 7, “Speed Ranges”).
2.
Predetermine set value at “Speed” input so that required torque is
reached.
Note
A set value in the 0 ... 5 V range at the “Speed” input is equal to a current
adjustment range of approx. 0 … 5 A.
Band width of current control: approx. 15 Hz
Digital open loop
speed control 1. Predetermine set value at “Speed” input so that required speed is
reached. The set value range of 0 ... +5 V is equal to a motor voltage
range of 0 V ... VCC. The maximum speed is determined by the supply
voltage and the speed constant of the motor and is independent of the
position of the switches S5 and S6.
2.
Adjust potentiometer P3 Imax to required limiting value.
Maximum current in the 0 … 10 A range can be adjusted in linear fashion
with potentiometer P3.
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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 MΩ(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 kΩ
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 kΩpull-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.
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maxon motor
Operating Instructions 1-Q-EC Amplifier DEC 50/5
5.1.3 “Direction” When the level changes, the motor slows down in an uncontrolled fashion (as
windings are short-circuited, see also chapter 5.1.5, “/Brake” function) and
accelerates in the opposite direction, until the nominal speed is reached
again. A speed ramp is only used during acceleration.
The “Direction” input is protected against overvoltage.
Input voltage range 0 ... +5 V
Input impedance 33 kΩpull-up resistor at +5 V
Continuous overvoltage protection -50 ... +50 V
Delay time approx. 12 ms
Clockwise (CW) Input open or
input voltage > 2.4 V
Counter-clockwise (CCW) Set input to Gnd or
input voltage < 0.8 V
If the direction is changed with a rotating motor shaft, the limitations described
in chapter 5.1.5, "/Brake" function must be observed, or the amplifier may be
damaged.
5.1.4 Ramp function The ramp function enables the motor speed to have a controlled run-up when it
starts up and if set values change.
Acceleration time is adjusted at the potentiometer P2 Ramp and relates to the
maximum speed in the currently chosen speed range (see chapter 7, “Speed
Ranges”).
adjustable acceleration time
on the potentiometer P2 Ramp approx. 20 ms ... approx. 10 s
Left end stop approx. 20 ms
Right end stop approx. 10 s
Pitch linear
approx. 1.0 s/pitch
Example:
Potentiometer P2 Ramp: 40 %
Change in “Speed” set value: 0 V to 3 V
Acceleration time to rated speed
sapproxs
V
V
timeonAccelerati 4.2.10%40
5
3=⋅⋅=
Note
The minimum acceleration time can only be reached if the gain is high and the
drive sufficiently dynamic.
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maxon motor
1-Q-EC Amplifier DEC 50/5 Operating Instructions
5.1.5 “/Brake” function If the input is not wired or the applied voltage is greater than 2.4 V, the /brake
function is deactivated.
If the input is placed at Gnd-potential or the applied voltage is lower than 0.8 V,
the /brake function is activated and the motor shaft slows down to a halt, short-
circuiting the motor windings. The motor windings remain short-circuited until
the /brake function is deactivated.
The /brake function is also used with an active /disable function.
The “/Brake” input is protected against overvoltage.
Input voltage range 0 ... +5 V
Input impedance 33 kΩpull-up resistor at +5 V
Continuous overvoltage protection -50 ... +50 V
Max. brake current 30 A
Delay time approx. 12 ms
“/Brake” inactive Input open or
input voltage > 2.4 V
“/Brake” active Set input to Gnd or
input voltage < 0.8 V.
The maximum permitted brake speed is limited by the maximum permitted
short-circuit current and maximum kinetic energy:
•I <= 30 A
•W
k<= 20 Ws
the values can be calculated as follows:
max. permitted brake
speed limited by brake
current
(I = 30 A)
The maximum permitted brake speed can be calculated from the
motor data:
(
)
][05.030
max rpmRkAn PhPhn
Ω
+
⋅
⋅= −
kn= Speed constant [rpm/V]
RPh-Ph = Terminal resistance phase-phase [Ω]
max. permitted brake
speed limited by kinetic
energy (Wk= 20 Ws)
With the given moment of inertia, the maximum speed can be determined
using the following formula:
][00010
365
max rpm
JJ
n
LR
⋅
+
=
JR= Rotor inertia [g•cm2]
JL= Load inertia [g•cm2]
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