Geo Brick Drive User Manual
Pinouts and Software Setup
31
Transformers
Y-Y or Y-
transformers should be used.
-
Transformers are NOT advised. They try to balance phases dynamically, creating instances of
instability in the Geo Brick Drive’s rectifying circuitry.
Note
A line reactor should be installed if a transformer or reliable source of
power is not available. Line reactors suppress harmonics bi-
directionally, eliminating low frequency spikes.
Fuses
High peak currents and high inrush currents demand the use of slow blow time delayed type fuses.
RK1 or RK5 (i.e. current limiting) classes are recommended.
The following table summarizes fuse gauges for three-phase bus input (240VAC) at full load:
Model
Fuse (amps)
Model
Fuse (amps)
GBL
4
-xx-
5
xx
15
GBL
8
-xx-
552
30
GBL
4
-xx-
8
xx
25
GBL
8
-xx-
882
45
GBL
6
-xx-
5
xx
35
GBL
8
-xx-
582
35
GBL
6
-xx-
8
xx
45
GBL
8
-xx-
852
35
Specific applications fuse sizing can be done using the following equations.
Take, as an example, a 4-axis Geo Brick (5/10A) on 240VAC bus, and driving 4 motors (5A continuous
current rating):
DC Bus Voltage:
√
[VDC]
Motor Phase voltage:
√
[VDC]
Power per axis:
[Watts]
Total power:
∑
[Watts]
Dissipated power:
[Watts]
Current draw per phase
(for 3
bus input)
√
[Amps]
Current draw per phase
(for 1
bus input)
√
[Amps]
Thus, 15 and 25 –amp fuses are chosen for three and single phase bus power input lines respectively.
Summary of Contents for Geo Brick
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