Rockwell Automation MinPak Plus DC Drive User Manual - Manual (Page 17)

3:6
should be suppressed to reduce
noise.
Wire AĆC Power to the
Controller
DANGER
THE DRIVE REQUIRES A
SINGLEĆPHASE POWER
SOURCE OF EITHER 115 VAC
OR 230 VAC, 50 OR 60 HZ. IF
THE CORRECT VOLTAGE IS
NOT AVAILABLE, A TRANSĆ
FORMER MUST BE INĆ
STALLED BETWEEN THE
POWER SOURCE AND THE
DRIVE. DO NOT OPERATE
THE CONTROLLER WITH
AVAILABLE SHORT CIRCUIT
CURRENTS IN EXCESS OF
5000 AMPERES. FAILURE TO
OBSERVE THESE PRECAUĆ
TIONS COULD RESULT IN
SEVERE BODILY INJURY OR
LOSS OF LIFE.
1. Size the AĆC line supply
conductors for the specific
controller rating and according
to all applicable codes.
2. Wire the AĆC line supply per
Figure 3Ć3.
Power Transformation
Although auto transformers may
step up or down the AĆC power
supply voltage, they do not isolate
the Drive from the AĆC line. Users
should consider using an isolation
transformer in lieu of an auto
transformer for the following
advantages:
D Should a person come in
contact with the AĆC incoming
line, an isolation transformer
would reduce the risk of severe
or fatal injury.
D AĆC power line disturbances and
transients are minimized by an
isolation transformer, thus
reducing possible damage to
solid state components.
D With an isolation transformer, the
Drive is free of plant power
system grounds, providing
electrical isolation for the Drive
from those grounds. Damaging
currents may be avoided in
instances where the DĆC output
is accidentally grounded or
where the DĆC motor circuits go
to ground.
Reliance offers a series of isolation
transformers suitable for use with
the MinPak Plus Drive. Refer to
Table 2Ć2.
Motor Overload Protection
Reliance utilizes a DĆC motor
thermostat for motor thermal
overload protection. The thermostat
is brought out through the motor
terminal box as leads P1 and P2.
These two leads must be wired to
the Controller terminals 32 and 132.
The thermostat leads can be run
with the motor armature and field
power wiring.
If an additional inverse time
overload is added, its normally
closed contact should be wired in
place of the motor thermostat and
connected to the controller at
terminals 32 and 132, or in series
with the motor thermostat when
both are used.
NOTE: The Drive will not start if the
circuit between 32 and 132 is not
made.
Place a jumper between terminals
32 and 132 if an external overload
device is not connected at these
terminals.
Armature Loop Contactor
Sequencing
WARNING
THE MINPAK PLUS DĆC DRIVE
MUST EMPLOY A CONTACĆ
TOR IN THE MOTOR ARMAĆ
TURE LOOP FOR POSITIVE
DISCONNECT OF THE MOĆ
TOR FROM THE DRIVE IN A
STOP CONDITION. AN INADĆ
VERTENT START CAUSED BY
NOISE OR DRIVE COMPOĆ
NENT FAILURE MAY CAUSE
UNEXPECTED MOTOR AND
MACHINE MOVEMENT IF A
CONTACTOR IS NOT USED.
FAILURE TO OBSERVE THIS
PRECAUTION COULD REĆ
SULT IN BODILY INJURY.
In all cases, the Drive must have an
armature loop contactor to
disconnect the motor from the
Controller on a Stop.
When the Armature Loop Contactor
is not supplied by Reliance, its
ON/OFF" sequence must be
integrated into the sequence control
of the regulator just as when the
Contactor is supplied by Reliance.
The "ON" sequence requires that
the contactor is closed and
approximately 8 milliseconds later
the Drive CR Relay is energized to
release the regulator. The OFF"
sequence requires that the Drive CR
Relay first clamps the regulator
(dropĆout of the CR Relay is about 8
milliseconds) and then the
contactor is allowed to dropĆout.
The M Contactor Adapter Kit is to be
used to connect the Contactor to
the Regulator to incorporate this
sequencing function.
Refer to Figure 3Ć5 for
Regulator/Contactor Start/Stop
timing.
The Contactor that is used must
have a 25VDC coil and a maximum
current draw of 150 milliĆamps. A
220 MFD capacitor must be
connected in parallel with the