TCI HG7 - Manual (Page 36)

P O W E R M O N I T O R P A C K A G E O N L Y
POWER MONITOR OPTION HG7 I, O, & M Manual 34
Troubleshooting Units Equipped with the HG2
TM
Protection Monitor
The HG2 TM Protection Monitor and Harmonic Power Factor Meter is included as standard in HG7
“XM” option filters rated over 20 kVar. Units rated 20 kVar and less have Blown Fuse and Filter
Enabled pilot lights to indicate their operating status and are not equipped with the HG2 as standard.
Troubleshooting information for pilot light equipped units is provided in the following section under
the heading Troubleshooting Units Equipped with Pilot Lights.
Normal Operation
The normal operation of the HG2 protection monitor is described in detail in the HG2 Protection
Monitor section of this manual. Refer also to HG2 Protection Monitor Calibration including figures 5,
6 and 7.
Protection Monitor Display and Status Lights
During Normal Operation, the green Filter Enabled LED should be on, the red Filter Disabled LED
should be off and the display should show the selected Operating Parameter.
If the HG2 display is blank and no LEDs are illuminated, the possible causes include:
♦ If the drive is also inoperable and lacking any "Power On" indications:
Three-phase power has probably been disconnected either manually or by the operation
of a protective device. Check the main disconnect and fuses or circuit breaker. If fuses
have blown or a breaker has tripped, a short circuit or severe overload condition has
probably occurred in the HG7 filter, drive, motor, or power wiring. Check for evidence of
damaged, burned, or overheated wiring or components.
♦ If the drive appears to be receiving power:
Check the primary and secondary control power transformer fuses in the HG7 filter.
If a fuse has blown, there is probably a short circuit, ground fault, or overload
condition in the HG7. Check for evidence of damaged, burned, or overheated wiring
or components.
Check the following items:
Control circuit wiring
Control circuit transformer
Cooling fan
HG2 Protection Monitor
If the fuses are good, the HG2 may be defective
If drive is operating but the HG2 display shows OFF, the red Filter Disabled LED is on and the
green Filter Enabled LED is off:
♦ Check the Filter Enable input to the HG2.
If the Filter Enable input is open, the Drive Aux Run contact may be open or
disconnected.
If the Filter Enable input is closed, the HG2 may be defective.