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Setup
Connections
EPOS4 50/5 Hardware Reference
3-20
CCMC | 2022-04 | rel10445
Table 3-12
Power supply requirements
1)
Use the formula below to calculate the required voltage under load.
2)
Choose a power supply according to the calculated voltage. Thereby consider:
a)
During braking of the load, the power supply must be capable of buffering the recovered
kinetic energy (for example, in a capacitor).
b)
If you are using an electronically stabilized power supply, make sure that the overcurrent pro-
tection circuit is configured inoperative within the operating range.
The formula already takes the following into account:
• Maximum PWM duty cycle of 90%
• Controller’s max. voltage drop of 1 V @ 5 A
KNOWN VALUES:
•
Operating torque M [mNm]
•
Operating speed n [rpm]
•
Nominal motor voltage U
N
[Volt]
•
Motor no-load speed at U
N
; n
O
[rpm]
•
Speed/torque gradient of the motor
Δ
n/
Δ
M [rpm/mNm]
SOUGHT VALUE:
•
Supply vV
CC
[Volt]
SOLUTION:
Power supply requirements
Output voltage
+V
CC
10…50 VDC
Absolute output voltage
min. 8 VDC; max. 56 VDC
Output current
Depending on load
• continuous max. 5 A
• short-time (acceleration, <15 s) max. 15 A
V
CC
U
N
n
O
-------
n
Δ
n
Δ
M
---------
M
⋅
+
1
0.9
-------
⋅
⋅
1
V
[ ]
+
≥