bonitron M3575R, Руководство для пользователей

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User’s Manual
19
4.
O
PERATION
The operation of the M3575R Resistive Load Module is passive in that there are no
parameters or adjustments that can be made before or during operation. Please refer to
the ratings charts in Tables 6-1 thru 6-4 in Section 6 and selection criteria for proper sizing
considerations.
4.1.
F
UNCTIONAL
D
ESCRIPTION
Braking resistors absorb energy from drives during braking by converting excess
power into heat. In order to control the drive
’s bus voltage level, a braking transistor
must be used. This transistor may be integral to the drive, or may be connected
externally. Refer to your drive manual for information on integrating the M3575R
Resistive Load Module with your drive.
4.2.
F
EATURES
4.2.1.
T
ERMINAL
S
TRIP
I/O
4.2.1.1.
O
VER
-T
EMP
The Over-Temp Switch is a normally closed thermostat that opens when
the case temperature exceeds 71ºC. This contact can be used to indicate
that the braking resistor is overheating due to excessive duty cycle.
4.2.1.2.
F
AN
P
OWER
Fan power is provided for cooling when the resistor is in operation. Refer
to the chart for the power requirements for your unit. Note that the fan
will not run continuously. When the fan thermostat is ON, the fan will run
until the thermostat cools down.
4.3.
S
TARTUP
4.3.1.
P
RE
-
POWER
C
HECKS
Ensure that all connections are tight and that all wiring is of the proper size
for operation. Check for exposed conductors that may lead to inadvertent
contact.
4.3.2.
S
TARTUP
P
ROCEDURE AND
C
HECKS
Apply power to your drive. Ensure that the resistive load has no current
flowing to it when the drive is in the idle state. If there is significant current
flowing to the resistor during the idle state, this can indicate that the resistor
is not properly attached to the drive. The resistor must be used with a
properly sized braking transistor. Once the resistor connection is verified, run
the drive through a normal acceleration and deceleration cycle. During the
deceleration cycle, current may be observed through the resistive load. Refer
to Section 5.3
Troubleshooting if the drive does not operate properly.
4.4.
O
PERATIONAL
A
DJUSTMENTS
No adjustments are necessary for this module.