41
108
Start Voltage of Parallel Motors
(MULTIM.START VOLT)
Value:
0.0 through parameter 103
Motor Voltage
✭
depends on par. 103
Motor Voltage
Function:
This parameter sets the voltage at 0 Hz for all drives with two or more
motors connected in parallel.
The start voltage represents a supplementary voltage input to the
motor. Increasing the start voltage will increase the starting torque. A
start voltage is especially useful for small motors (<5 hp) as they have a
higher stator resistance than larger motors.
This function is only active if
Parallel Motors
has been selected in
parameter 101,
Torque Characteristics
.
Description of choice:
To set the start voltage, monitor the motor current while starting the load
and choose the starting voltage that gives the lowest starting current.
Start with a small value and increase only as required for reliable
starting.
109
Resonance Dampening (RESONANCE DAMP.)
Value:
0 to 500 %
★
100 %
Function:
High-frequency resonances in the motor can be eliminated by adjusting
this parameter.
Description of choice:
Adjust the dampening percentage for smoothest high speed operation.
110
High Breakaway Torque (HIGH START TORQ.)
Value:
0.0 to 0.5 sec.
★
OFF
Function:
The drive is able to breakaway high friction loads. This high starting
torque, approximately 1.6 x rated torque is available for up to 0.5
seconds. The current level is limited by the protective circuits of the
drive. OFF corresponds to 0.0 sec.
Description of choice:
Set the time for which high starting torque is desired.
111
Start Delay
(START DELAY)
Value:
0.0 to 120.0 sec.
★
0.0 sec.
Function:
This parameter allows a delayed start of the drive after the conditions
for start have been fulfilled. After the start delay time has elapsed, the
drive will start and ramp up to the commanded speed.
Description of choice:
Set the desired time before the drive will start.
112
Motor Preheat
(MOTOR PREHEAT)
Value:
✭
Disable (DISABLE)
[0]
Enable (ENABLE)
[1]
Function:
The motor preheat function protects the motor from condensation by
running a small DC current through the motor. Motor preheat is only
active during stop when control voltage is applied to terminal 27.
Description of choice:
Select
Disable
if this function is not required. Select
Enable
to activate motor
preheating. The amount of motor preheating is set in parameter 113.
CAUTION
Motor Damage!
Be sure to check settings in parameter 113 if
parameter 112,
Motor Preheat
, is enabled. Do
not apply any more current than required.
Excessive current or preheating time may
damage the motor.
113
Motor Preheat DC Current
(PREHEAT DC-CURR.)
Value:
0 to 100 %
★
50 %
The maximum value depends on the rated motor current.
Function:
The motor can be preheated when stopped by applying DC current to
it. A holding torque can also be provided.
Description of choice:
The motor can be preheated by means of a DC current. At 0%, the
function is inactive; at a value higher than 0%, a DC current will be
supplied to the motor whenever it is stopped. A windmilling fan can be
held by providing a holding toque by using this parameter.
✭
I
ndicates factory default setting. Numbers in brackets [ ] represent selection as displayed on the serial bus.
