M3534R 40&85A
24
4.3. S
TARTUP
WARNING!
The M3534R RTM contains capacitive elements for energy storage. Be
aware that high voltages may exist inside the module even after the unit
has been disconnected. Always allow ample time for these voltages to
discharge before attempting service. Only qualified technicians should
complete this start up procedure. Failure to heed this warning may result
in severe bodily injury or death!
4.3.1. P
RE
-P
OWER
C
HECKS
Before beginning, be sure that the main disconnect for the M3534R is in the
OFF position.
Ensure that the model M3534R Ride-Thru module has been properly
installed and wired as previously outlined in the Installing the M3534R
Ride-Thru Module and Wiring the M3534R Ride-Thru Module sections of
this manual.
The DC bus threshold setpoint of the M3534R RTM must be coordinated
with the under voltage trip setting of the inverter. If the threshold is too
close to the nominal bus, the RTM may supply power to the drive
continuously, and overheat. If the threshold is too close to the under
voltage trip level of the inverter, the RTM may not "ride-thru", and under
voltage trips on the drive may still occur during sag events.
Most inverters have an under voltage trip point of 15% below nominal DC bus
levels. Some inverters can be reprogrammed to change this trip level.
Bonitron typically sets the DC bus threshold to be approximately 10% below
nominal level. For example, Bonitron sets all 460VAC systems to hold the
640V DC bus to 585VDC. Refer to the inverter documentation for details on
adjusting its under voltage trip setting if the factory default setting is other
than 15% below nominal DC bus level.
4.3.2. S
TARTUP
P
ROCEDURE
A
ND
C
HECKS
Ensure that the associated inverter is on-line and functioning properly.
Ensure that the DC bus polarity is correctly wired at the disconnect switch
connecting the inverter DC bus with the RTM DC bus.
Apply power to the M3534R module and verify the following start-up
sequences:
M3534R module POWER LED comes
ON
, the RT ACTIVE LED
flashes
ON
, and the OVERTEMP LED remains
OFF
.
40A & 85A units
: Approximately 4 seconds after logic power comes up the
precharge will be considered complete and the RTM is ready to provide
ride-thru support.
4.3.2.1. V
ERIFY
R
IDE
-T
HRU CAPABILITY
1.
Apply 24V to TEST input, or press TEST button if DP Series front
panel option is installed.
DC bus voltage will rise for duration of test
Drive input current will drop for duration of test
This proves power is transferred from RT module to inverter, and that the
RT is functioning. See THRESHOLD procedure below for more detailed
description.
