Motorguard operation, Adjustments, Monitor board settings (for units with boards) – TCI KMG User Manual
Page 24: Variable frequency drive settings, Start up (commissioning), Before applying power for the first time, Before operating the vfd for the first time, Operation
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MotorGuard Operation
Adjustments
Monitor Board Settings (for units with boards)
The monitor board configuration switches are factory set and should not be changed. The monitor
board component layout is shown in Figure 5 in the Maintenance and Service section on a following
page. Make sure that the configuration switches are set as follows:
♦ For 480 volt models: Set all sections of S1 to ON.
Alarm level dv/dt = 1000 V/
μs.
Alarm level peak voltage = 1000 V
♦ For 600 volt models: Set all sections of S1 to OFF.
Alarm level dv/dt = 1500 V/
μs.
Alarm level peak voltage = 1500 V
Variable Frequency Drive Settings
Make sure that the variable frequency drive is set for operation modes and ranges that are compatible
with the MotorGuard:
♦ Maximum output frequency: 80 Hz
♦ PWM switching frequency between 2 kHz and 12 kHz, ideally 4 kHz to 8 kHz. Since the
MotorGuard removes most of the harmonic content from the output waveform, quiet
motor operation should be achieved with a switching frequency setting within this range.
♦ Mode of operation: "scalar" or "V/Hz" without DC braking unless the drive applications has
been confirmed by TCI Technical Support
Start Up (Commissioning)
Caution
Thoroughly check the installation before applying power and operating the equipment for the
first time.
Caution
Never Operate the MotorGuard without a load connected to its output terminals.
Before Applying Power for the First Time
Inspect the installation to make sure that all equipment has been completely and correctly installed in
accordance with the Installation Guidelines section of this manual.
Before Operating the VFD for the First Time
♦ Make sure that the MotorGuard monitor board configuration switches are properly set as
described above.
♦ Make sure that the variable frequency drive is set for operation modes and ranges that are
compatible with the MotorGuard as described above.
Operation
Since the MotorGuard is a passive filter, it is always operating whenever the variable frequency drive
is operating. Whenever the VFD is operating, control power should be applied to the MotorGuard so
that the MotorGuard's cooling fan will operate and prevent it from overheating. Control power is also
required for the performance monitoring and fault warning circuit.