Check Function Code 56, Reverse Sensing Mode
When there is no load current and the regulator will not
operate in automatic, check the
C
switch on the back
panel. If the
C
switch is closed and FC 56 is set for
bidirectional
, the regulator will not operate in automatic.
The
C
switch should be open for normal operation.
Check Function Code 6, Auto Operation Blocking
Status
.
Check the Auto/Remote/Manual switch. The switch
should be on
Auto/Remote
.
2 .
Verify that FC 69 is set to
Normal
. To check the FC 69
setting:
Function
,
69
,
Enter .
3 .
If not on
Normal
and resetting is blocked by the secu-
rity feature, enter the security code via the keypad to
change the blocking status:
A .
Function
,
99
,
Enter
32123
(default),
Enter .
B .
Function
,
69
,
Enter .
C .
Edit/Reset
, Scroll to
Normal
,
Enter
.
Check Function Code 70, Tap-to-Neutral
.
Verify that FC 170 is set to
Off
. To check the FC 170
setting:
Function
,
170
,
Enter .
2 .
If not on
Normal
and resetting is blocked by the secu-
rity feature, enter the security code via the keypad to
change the blocking status:
A .
Function
,
99
,
Enter
12121
(default),
Enter .
B .
Function
,
170
,
Enter .
C .
Edit/Reset
, Scroll to
Off
,
Enter
.
Testing with the Voltage Limiter ON and a Limit
Value Set
When testing a regulator with external power, it is recom-
mended that Function Code 80, Voltage Limiter Mode be
set to
Off
.
When testing in the Auto mode with the voltage limiter on,
there may be problems getting the regulator to operate
in either raise or lower direction if the external voltage is
greater than the voltage limit settings.
No Band Indicators
If the band indicators are not working when the voltage is
out-of-band, check the following:
.
Check FC 56, Reverse Sensing Mode. If FC 56 is set to
Lock Forward
and there is reverse power, the indica-
tor will not display and the voltage will not regulate.
2 .
Check FC 57, Reverse Current Sense Threshold and
*Load Current
(*Metering PLUS). If the load current is
less then the reverse threshold current, the indicators
will not work and the regulator will not regulate.
3 .
Check the polarity of the current transformer. If the
polarity is reversed, the band indicators will not dis-
play.
Junction Box Troubleshooting
This section is used if the regulator will not operate manu-
ally. (Problem was isolated to junction box or regulator tank
after checking out control.)
The junction box is composed of a terminal board, the
position indicator, and the control box interconnections.
Refer to Figure 28.
.
Remove the unit from service, as outlined in the
INSTALLATION: Removal from Service
section of
this manual.
2 .
Ground the three high-voltage bushings.
3 .
Open
V
, disconnect switch, on rear panel of control
cabinet.
4 .
Remove junction box lid.
5 .
Check the wiring on the junction box terminal board
for
loose connections, burnt wiring, or bad swage
joints .
6 .
Set the power switch to
EXTERNAL
.
7 .
Apply a 60/50 Hz, 120 V ac nominal variable source to
the external source terminals. Make certain to maintain
correct polarity.
8 .
Set the control function switch on
MANUAL
.
.
Toggle the raise switch. Measure the voltage between
terminals
R
and
G
on terminal board. The voltage read-
ing should be approximately 120 V ac.
0 .
Move the voltmeter leads to
L
and
G
. Toggle the lower
switch.
.
Measure the voltage between terminals
L
and
G
on
terminal board. The voltage reading should be approxi-
mately 120 V ac.
3
S225-10-30
!
SAFETY
FOR LIFE
CAUTION:
Equipment Damage. Be mindful of polar-
ity when using an external source. Polarity reversal will
result in control damage.
VR-T201.0
WARNING:
Hazardous Voltage. This procedure
must only be performed on a regulator that has
been removed from service. Failure to comply can cause
serious injury or death.
VR-T224.0
