3200 Series
Part No HA028651 Issue 7.0 Apr-09 99
16.3.6
CT Calibration
To calibrate the current transformer input, connect the current transformer
to terminals CT and C.
Then in configuration level
Operation
Do This
Display View
Additional Notes
Select the current transformer
low point calibration phase
1.
From the ‘C A L ’ list header press
°
to
select ‘PHASE’
2.
Press
V
or
W
to choose ‘
Ct 0
C t 0
p h a s e
Scrolling display
‘
C A L IB R A T IO N p h a s e
’
Adjust the CT for no current applied to the input
Calibrate the CT low point
3.
Press
°
to select ‘GO’
4.
Press
V
or
W
to
‘
yes
’
Scrolling display
‘
C A L IB R A T IO N s ta rt
’
The controller automatically calibrates to the zero current input.
As it does this the display will show
busy
then
pass
, assuming a successful calibration.
If it is not successful then ‘
FAIL
’ will be displayed. This may be due to an incorrect input current
Select the current transformer
high point calibration phase
6.
Press
V
or
W
to choose
‘
Ct 70
C t 7 0
p h a s e
Adjust the CT for a current of 70mA dc
7.
Press
°
to select ‘GO’
8.
Press
V
or
W
to ‘
yes
’
The controller again
automatically calibrates to 70mA
If it is not successful then ‘
FAIL
’
will be displayed
16.3.7
To Return to Factory Calibration
It is always possible to revert to the factory calibration as follows:-
Operation
Do This
Display View
Additional Notes
Select the calibration
phase
1.
From the ‘CAL’ list header press
°
to select ‘PHASE’
n o n e
p h a s e
Select factory calibration
values
2.
Press
V
or
W
to choose ‘
FAct
’
Confirm
3.
Press
°
to select ‘GO’
4.
Press
V
or
W
to choose
‘
yes
’
The controller automatically returns to
the factory values stored during
manufacture
Controller
70mA dc
Source
CT
C
-
+
