bonitron M3534-I3, Customer Reference Manual

Page: 15 / 56

User’s Manual
15
During a power quality event, the AC input to the drive will not be drawing
current. Sizing the incoming AC feed to supply both the drive and the
M3534 simultaneously is not necessary. Even though the input current
during a power quality event may be higher than the normal input current,
this temporary overload is allowed by most codes without upsizing the
normal AC feed bus.
Due to the increased currents in the AC feed during a power quality event,
the total IR drop of the incoming AC feed should be considered to make
sure the voltage doesn't dip too low.
If line chokes are to be used in the system, the M3534 must be installed
on the load side of these chokes. This minimizes the possibility of
circulating currents through the M3534 and converter section of the VFD.
There is no need to connect the AC line to the M3534 if an ultracapacitor
or battery bank is being used. See Figure 3-5.
3.4.1.2.
S
TORAGE
B
US
(+ -) C
ONNECTIONS
If a storage module is used, such as ultracapacitors or batteries, the input
from this module is made at the Storage Bus terminals.
Make sure the polarity is correct for the connection, failure to do so can
cause severe damage to the system.
DANGER!
F
OR SYSTEMS THAT HAVE
DC
STORAGE
,
ALWAYS MEASURE
DC
VOLTAGES
,
AND
FOLLOW PROPER PRECAUTIONS TO ENSURE THEY ARE AT SAFE LEVELS BEFORE
MAKING CONNECTIONS
.
3.4.1.3.
D
RIVE
B
US
(- +) C
ONNECTIONS
The M3534 must have a DC bus connection directly to the DC bus filter
capacitors within the drives. Connections cannot be made through the
braking terminals or with precharge resistors or DC link chokes between
the output of the M3534 and the DC bus capacitors in the drive. Consult
the manufacturers' documentation or contact Bonitron for further
assistance.
Make sure the polarity is correct for the connection, failure to do so can
cause severe damage to the system.
DANGER!
F
OR SYSTEMS THAT HAVE
DC
STORAGE
,
ALWAYS MEASURE
DC
VOLTAGES
,
AND
FOLLOW PROPER PRECAUTIONS TO ENSURE THEY ARE AT SAFE LEVELS BEFORE
MAKING CONNECTIONS
.
3.4.1.4.
G
ROUNDING
R
EQUIREMENTS
All units come equipped with a ground stud that is connected to the
module chassis. Ground the chassis in accordance with local codes.
Typically, the wire gauge will be the same as is used to ground the
attached drive.
3.4.2. C
ONTROL
I
NTERFACE AND
I/O W
IRING
Control wiring allows for remote enabling, testing, and monitoring of the
M3534. Inputs can be a dry contact using an internally generated, isolated
supply, or an external 15-24VDC signal.