7-6
Power Connections
DC Bus
TB1-1 and TB1-2 are the DC Bus connections for an external shunt.
ODM-010 or
ODM-010i
9 A. AC
rms
100 A peak
10 A
2.5 (14)
2 kVA
min
100 kVA
max
ODM-020 or
ODM-020i
18 A. AC
rms
100 A peak
20 A
4.0 (12)
4 kVA
min
100 kVA
max
1. In the United States, the National Electrical Code (NEC), specifies that fuses must be selected
based on the motor full load amperage (FLA), which is not to be confused with the drive input
current. The largest fuse allowed under any circumstances is four times the motor FLA. Therefore
the largest fuse permissible for use with the OMNIDRIVE is four times the motor rated continuous
current (converted to an RMS value). The Digital Servo Drive has been evaluated and listed by
Underwriters Laboratories Inc. with fuses sized as four times the continuous output current of the
drives (FLA), according to UL 508C.
In almost all cases fuses selected to match the drive input current rating will meet the NEC
requirements and provide the full drive capabilities. Dual element, time delay (slow acting) fuses
should be used to avoid nuisance trips during the inrush current of power initialization. The fuse
sizes listed are recommended values, but local regulations must be determined and adhered to.
The OMNIDRIVE utilizes solid state motor short circuit protection rated as follows:
Short Circuit Current Rating with No Fuse Restrictions:
Suitable for use on a circuit capable of delivering not more than 5000 RMS symmetrical Amperes,
240 Volts maximum.
Short Circuit Current Rating with Fuse Restrictions:
Suitable for use on a circuit capable of delivering not more than 200,000 RMS symmetrical Amperes,
240 Volts maximum, when protected by high interrupting capacity, current limiting fuses (Class
CC, G, J, L, R, T).
a. Technical Note Number 1 details Transformer Sizing requirements for a variety of applications.
Intro
!
DANGER
DC bus capacitors may retain hazardous voltages after input power has been
removed, but will normally discharge in several seconds. Before working on the
drive, measure the DC bus voltage to verify it has reached a safe level or wait
the full time interval listed on the warning on the front of the drive. Failure to
observe this precaution could result in severe bodily injury or loss of life.
Intro
!
WARNING
External shunt resistors connect directly to the power bus. For safety
reasons, external shunt resistors must be enclosed.
Intro
!
CAUTION
Do
not
connect an external I/O power supply to the DC Bus. The DC+ and DC-
terminals connect directly to the power bus of the drive.
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