Connections
Connectors
© 2017 maxon motor. Subject to change without prior notice.
maxon motor control
4-26
Document ID: rel7748
EPOS2 Positioning Controller
Edition: November 2017
EPOS2 24/2 Hardware Reference
4.2.1.6
Supply Voltage
Best Practice
Keep the motor mechanically disconnected during setup and adjustment phase.
D
ETERMINATION
OF
P
OWER
S
UPPLY
Basically, any power supply may be used, provided it meets below stated minimal requirements.
1)
Calculate required voltage under load using following scheme (the formula takes a max. PWM
cycle of 90% and a max. voltage drop of −1 V at EPOS2 24/2 into account):
K
NOWN
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
Δ
n/
Δ
M [min
−1
mNm
−1
]
S
OUGHT
VALUE
:
•
Supply voltage V
CC
[Volt]
S
OLUTION
:
2)
Choose power supply capable as to above calculation. Thereby consider:
a) During braking of the load, the power supply must be capable of buffering the fed back
energy, e.g. in a capacitor.
b) When using an electronically stabilized power supply, observe that the overcurrent protec-
tion must not be activated in any operating state.
Power Supply Requirements
Output voltage
V
CC
min. 9 VDC; V
CC
max. 24 VDC
Absolute output voltage
min. 8 VDC; max. 28 VDC
Output current
Depending on load (continuous max. 2 A / acceleration, short-time max. 4 A)
+V
CC
Power_Gnd
Connector [J1] Pin [13]
Connector [J1] Pin [12]
V
CC
U
N
n
O
-------
n
B
Δ
n
Δ
M
---------
M
B
⋅
+
1
0.9
-------
⋅
⋅
1
V
[ ]
+
=
