Magnetek DSD 412, Technical Manual

Page: 52 / 122

DRIVE SETUP AND ADJUSTMENT
52
unwanted mechanical disturbances.
Reducing the setting value will provide
smoother operation but at the expense of
time-delayed reaction to velocity errors,
particularly noticeable when re-leveling.
Function # 49
Weak Field Current
Units: ADC
Range: 0.2 – 40.0
Default: 40.0
This input is the motor field current the drive
should provide at rated motor RPM. Set this
value to produce rated motor CEMF (no load
voltage) at rated top speed. NOTE: Motor
field current will not exceed the setting of
function 50. Setting or leaving this value at
default simply means that the field will not
weaken at high speeds.
Function # 50
Rated/Full Field Current
Units: ADC
Range: 0.20 – 40.00
Default: 1.9
This is the motor field current amperes the
drive should provide when starting and at low
speed. It should agree with Rated / Full / or
Forcing Motor Field Current per the motor
nameplate.
Function # 51
Field L/R
Units: SEC
Range: 0.10 – 10.00
Default: 0.54
This is the Motor Field time constant, L/R. It
is an important value to determine motor field
current regulator gains. See function 615
after performing the Self-Tune.procedure
Function # 52
Rated Field Vdc
Units: VDC
Range: 50 – 525
Default: 240
This is the Rated Field Voltage necessary to
produce Full field amps function 50. It is used
to calculate motor field circuit resistance and
determine motor field current regulator gains.
Improper adjustment can affect stability.
Function # 53
Standby Field Current
Units: %
Range: 10 - 100
Default: 25
This percent of the full field current amperes
that the drive should provide when the
elevator system is at rest (i.e. no Run
command or Field Enable command
received).
Function # 54
Field Response
Units: RAD
Range: 1.0 – 10.0
Default: 5.0
This input defines the desired motor field
current regulator bandwidth in radians per
second.
Function # 55
Field Source Volts AC
Units: VAC
Range 0. – 525.
Default: 0
This is the single-phase AC voltage used to
power the Field Rectifier module. The factory
default value of zero will let the drive
automatically select the same value as
supplied for the nominal AC voltage as set by
function 9. This conforms to factory supplied
wiring supplied at AC1 and AC2 on the field
interface PCB. Set this only if an external
transformer is used to supply a different
voltage to power the motor field circuit, set
this value to the nominal Vac provided at
terminals AC1 and AC2.
Function # 63
U/D Bit Pickup
Units: % (of rated speed)
Range: 0.01 – 100.00
Default: 0.1
This entry defines the zero speed threshold
for detection of motion via encoder
measurement. It controls the Moving-
Up/Down, & Zero Speed detector output
signals, and determines when ARB will be
turned back ON if function 130 is set to 2.