maxon motor
EPOS Positioning Controller
EPOS 70/10 Hardware Reference
7.1
Power supply connector (J1)
Any available power supply can be used, provided it meets the
minimal requirements set out below.
During set up and adjustment phases, we recommend separating the
motor mechanically from the machine to prevent damage due to
uncontrolled motion.
Power supply requirements
Output voltage
V
CC
min. 11 VDC; V
CC
max. 70 VDC
Ripple
< 10 %
Output current
Depending on load,
continuous min. 10 A
acceleration, short-time min. 25 A
The required voltage can be calculated as follows:
Known values:
•
Operating torque M
B
[mNm]
•
Operating
speed
n
B
[min
-1
]
•
Nominal motor voltage U
N
[Volt]
•
Motor no-load speed at U
N
, n
0
[min
-1
]
•
Speed/torque gradient of the motor
∆
n/
∆
M [min
-1
mNm
-1
]
Sought value:
•
Supply
voltage
V
CC
[Volt]
Solution:
]
[
1
9
.
0
1
)
(
0
V
M
M
n
n
n
U
V
B
B
N
CC
+
⋅
⋅
∆
∆
+
⋅
=
Choose a power supply capable of supplying this calculated voltage
under load. The formula takes a max. PWM cycle of 90 % and
a 1 volts max. voltage drop at EPOS 70/10 into account.
Consider:
During braking of the load, the power supply must be capable of
buffering the fed back energy, e.g. in a capacitor or shunt regulator
(235811).
When using an electronically stabilized power supply observe that the
over current protection shall not be activated in any operating state
Figure 5: Power connector (J1)
Pin
No.
Signal Description
1
Power_Gnd
Ground of supply voltage
2
+V
CC
Power supply voltage
+11 ... +70 VDC
Accessories: EPOS power cable
maxon order number:
275829
Notes: Suitable connector:
Molex Mini-Fit Jr.
TM
2 poles (39-01-2020)
Suitable crimp terminals: Molex Mini-Fit Jr.
TM
female crimp
terminals (444-76-1111)
Suitable hand crimper:
Molex hand crimper (69008-0724)
9
maxon motor control
December 2008 Edition / document number 752380-04 / subject to change
