Power Supply; Determination Of Power Supply - maxon motor EPOS2 Module 36/2 Hardware Reference Manual

Connections

Power Supply

4.3 Power Supply
Best Practice
Keep the motor mechanically disconnected during setup and adjustment phase.
External Protection
Supply voltages above 40 VDC will destroy the unit.
To prevent damage to the EPOS2 Module 36/2, we recommend to install two upstream fuses – a tran-
sient voltage suppressor diode (TVS diode) and a capacitor in the power supply voltage line (for details

chapter "5.1.2 Power Supply Voltage" on page 5-37).
4.3.1
Basically, any power supply may be used, provided it meets below stated minimal requirements.
Power Supply Requirements
Output voltage
Absolute output voltage
Output current
1)
K
NOWN VALUES
S
OUGHT VALUE
S
OLUTION
V
CC
2)
Pin
A1/6
B1/11
A2/3/4
Limited Current Rating per Pin
Due to the limited current rating per pin (1.1 A), you must connect all pins!
4-20

Determination of Power Supply

V
CC
min. 0 V (V
max. 40 VDC
Depending on load (continuous max. 2 A / acceleration, short-time max. 4 A <1 s)
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 Module 36/2 into account):
:
• Operating torque M [mNm]
B
• Operating speed n [min
B
• Nominal motor voltage U
• Motor no-load speed at U
Speed/torque gradient of the motor Δn/ΔM [min
•
:
• Supply voltage V [Volt]
CC
:
U Δn

N
⋅ ⋅
------ - -------- - M
= n +

ΔM
B
n
O
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 or shunt regulator (309687).
b) When using an electronically stabilized power supply, observe that the overcurrent protec-
tion must not be activated in any operating state.
Signal
Power_Gnd
V
CC
© 2017 maxon motor. Subject to change without prior notice.
min. 11 VDC; V max. 36 VDC
CC
below 11 V is only possible with separate logic supply voltage!) /
CC
]
−1
[Volt]
N
, n [min ]
−1
N 0
−1

1
⋅ 1 V [ ]
------ -
+

B
0.9
Description
Ground of supply voltage
Power supply voltage +11...+36 VDC
Document ID: rel7050
Edition: May 2017
mNm ]
−1
EPOS2 Positioning Controller
EPOS2 Module 36/2 Hardware Reference
maxon motor control