Quadlogic MiniCloset-5c, Installation Manual

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© COPYRIGHT 2009
Quadlogic Controls Corporation
71
C
HAPTER
8
T
ROUBLESHOOTING
R
ESOLVING
M
ETER
I
SSUES
Problem: Meter does not power up
•
Make sure the voltage plug is connected to the meter head.
•
Measure voltage connections at fuse block (phase to neutral).

WYE meter models power phase A to neutral.

Delta meter models power phase A to phase B.
•
If expected voltage is present, check fuses at fuse block (black box located inside the
meter on the back panel).
•
1 fuse for meter power (must be either 1/4th A for 120V or 1/8th A for 277 V).
•
3 fuses for voltage measurements (4A).
•
If proper voltage is present at the fuse block and the internal fuses are good and LCD still
does not display anything, return meter head only for RMA repair. (It is not necessary to
return meter box with fuse block.)
Problem: Zero voltage appears on the LCD
•
Measure voltage connections at fuse block (phase to neutral)

WYE meter models power phase A to neutral

Delta meter models power phase A to phase B
•
If expected volts are present, check fuses at fuse block (black box located inside the meter
on the back panel).

1 fuse for meter power (must be either 1/4th A for 120V or 1/8th A for 277 V)

3 fuses for voltage measurements (4A)
Problem: Negative watts
•
CT is reversed. Check phase polarity of CT installation.
•
Verify proper connection of CT secondaries.
•
Verify proper connection of any contractor wire extension.
•
Confirm that the phase angle is b30° and -30°.
Problem: Phase Angle not b30°and -30°(see Figure 8-1 for Vector Diagram)
•
If angle falls between 90° and 150° OR between –90° and –150°:

the CT is installed on one of the incorrect phases
•
If angle falls between 150° and –150°:

the CT polarity is reversed OR the wires are reversed
•
If angle falls between –30° and –90°:

that means the CT polarity is reversed AND the CT is installed on one of the
incorrect phases
•
If metering large inductive loads (e.g. Elevators, HVAC, pumps) phase diagnostics may not
be an accurate verification