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One Solution Any Application ANY Voltage
2
Any Voltage Elmo’s Gold Servo Drives support a large voltage range:
from 10VDC to 800VDC
from 30VAC to 530VAC
They are divided into a few operating ranges and Elmo’s DC Bus offers the following:
10VDC -100VDC
40VDC- 200VDC
100VDC- 400VDC
200VDC - 800VDC
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Any Voltage For non-standard, justified requests:
10VDC- 48VDC
10VDC- 60VDC
These two are needed mainly for greater efficiency with very high current drives
Why justified requests? Usually suits applications with special not standard needs
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Any Voltage The Tambourine
A compact, direct-to-mains power supplies for servo applications, up to 530 VAC
TAM
VP +
VN -
Elmo Isolated Drive
TAM001A
-t°
U
AC2-t°
-t°
U
U
AC1
AC3
PE
C.M.CThree Phase
Mains AC network
VP +
VN -
Neutral (0)
Safety Regulations
Earth (PE)
Rshunt
PE
AC1
AC2
AC3
PE
For more about power supplies:
http://www.elmomc.com/products/servo-power-supplies.htm
http://www.elmomc.com/applications/Power-Supply-for-Servo-Applications.htm
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Any Voltage
Power supplies for servo applications must have:
adequate DC Bus
sufficient power resources to drive the loads
voltage variations within acceptable limits
bi-directional energy flow
high-frequency power handling
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Any Voltage
Power supplies for servo applications must:
meet safety standards
comply with EMC, Immunity & Emission +
limit and control the inrush current
control & limit leakage currents
withstand tough environmental requirements (vibrations, temperature, humidity, etc.)
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Any Voltage Elmo recommends a shared DC Bus in any application with a number of axes >2.
Advantages include:
Sharing the power Bus resources
Regeneration sharing
Sharing the safety, protections, EMI, etc.
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Any Voltage
The shared DC Bus
yields a more powerful DC source for each drive
more powerful, efficient and practical regeneration
saves 5% - 8% of the power consumption
reduces the amount of external, mandatory components (circuit breakers, contactors, filters, etc.)
reduces space (for > 2 axis applications)
decreases heat dissipation
diminishes stress from the AC network
cuts overall costs (for > 2 axis applications)
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Any Voltage Single phase or 3 phases?
Single phase is more cost effective
Three phases are technically better as they provide more stability, have less ripple, more balanced network loading, etc.
Up to a few KWs (2 KW- 3 KW) the single phase is a reasonable compromise
Single phase neutral conductor must usually be limited to <30 A - 40 A
Single phase 230 VAC servo drives and motors cost less and are more common (especially in the Far East) than 400 VAC servo drives and motors
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Any Voltage
So, which voltage to choose?
The mandatory rule is that:
The voltage must be able to satisfy the needs of the speed & torque/force
Then select according to constraints or convenience
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Any Voltage
Which voltage to choose?
Constraints:
The motor determines the voltage. In many cases, such as Direct Drive (linear or rotary), a very high voltage is needed to achieve speed and current requirements.
The Bus of the application is given. For example: battery 24 VDC, 48 VDC machine’s Bus etc.
A transformer should not be required
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Any Voltage
Which voltage to choose?
Convenience:
The freedom to select. Given only the speed and torque/ force allows selecting the optimum combination of motor windings, drive’s size and thus the operating voltage.
Massive multi-axis. For example: an application with 61 axis X 1.5 KW (a real case). The question is: what is more convenient ─ 100KW isolation transformer or direct-to-the-mains 3X400 VAC?
For High power (>15 KW) the 3X400 VAC is much more convenient than any other voltage Bus.
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Any Voltage
Which voltage to choose?
Convenience:
Working direct-to-the-mains is always more convenient and saves the need for an isolation transformer, but it’s not always better!
For more about power supplies:
http://www.elmomc.com/products/servo-power-supplies.htm
http://www.elmomc.com/applications/Power-Supply-for-Servo-Applications.htm
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Any Voltage
Gold Servo Drive Standard Compliance
Each DC input is independently compliant with:
Safety standards
UL508c
IEC61800
UL60950
EMC standards
IEC61800-3
