Geo Brick Drive User Manual
Pinouts and Software Setup
37
Caution
The external shunt resistors can reach temperatures of up to 200°C.
They must be mounted away from other devices and ideally near the
top of the cabinet, also ensure they are enclosed and cannot be touched
during operation or anytime they are hot. Sufficient warning labels
should be placed prominently nearby.
The black wires are for the thermostat and the white wires are
for the shunt resistor.
The shunt resistor incorporates a normally closed (N.C)
thermal overload protection thermostat that opens up when the
core temperature of the resistor exceeds 225°C (450° F). This
thermostat is accessible through the two black leads. It is
important that these two leads be wired in a safety circuit to
halt operation should the resistor temperature exceed the
specified threshold.
The external shunt resistor Ohm rating range is found so that
the minimum value limits the current to the permissible
amperage, and that the maximum value limits the bus (during
deceleration) to the permissible voltage.
Safety
Logic
Circuit
Regen+
Regen-
H
o
t!
Note
The shunt circuitry turn-on threshold is 385VDC (~272 VAC). The
turn-off threshold is 360VDC (~255VAC).
Note
Newer models of the Geo Brick Drive incorporate an internal shunt
resistor rated at 300W, 100-Ohms.
Note
Newer models of the Geo Brick Drive were introduced in October of
2012. They can be recognized by the 4-pin terminal block logic and
STO connector.
Summary of Contents for Geo Brick
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