3200 Series
Part No HA028651 Issue 7.0 Apr-09 49
9.2
Current Transformer Input Parameters
This is optional on 3200 controllers and can measure, via an external current transformer, the current flowing through the
electrical load when the heat output is ‘on’ (load current) and also when it is ‘off’ (leakage current).
☺
3216 controllers can be fitted with optional EIA232 digital communications. In this case the current transformer
input is not available.
Alarm
If the load current is lower than a threshold limit or the leakage current is higher than a
threshold limit, then an alarm triggers. The hysteresis to exit from either of these alarm
conditions is fixed at 2% of the current transformer span.
Full scale value
Selectable from 10 to 1000A
CURRENT TRANSFORMER LIST ‘
C T - i N P
’
Name
Scrolling
Display
Parameter Description
Value
Default
Access Level
Ct.Id
MODULE TYPE
CT module identity
Ct.In
CT input circuit fitted
As order
code
Conf read only
none
None
IO-1
Input/output 1
OP-2
Output 2
CT.SRC
CT SOURCE
Selects the output controlling the
current measured by the CT
input.
The source can only be selected
if the output has been
configured for Heat or Cool
aa
AA Relay
CT.RNG
CT RANGE
Sets the CT inputs range
0 to CT full scale value (1000)
As order
code
Conf
nonE
No latching
Auto
Latched with automatic
reset
CT.LAT
CT ALARM
LATCH TYPE
To configure the latch mode of
the CT input alarm.
A description of alarm latching is
given in the alarm section
man
Latched with manual reset
no
Conf if CT alarm
enabled
Ld.alm
LOAD CURRENT
THRESHOLD
Load open circuit alarm
threshold – low alarm
Off
to CT full scale value (settable to
3000)
Read only
LK.ALM
LEAK CURRENT
THRESHOLD
Leakage current in the off state
alarm threshold – high alarm
Off
to CT full scale value (settable to
3000)
Read only
Hc.alm
OVER
CURRENT
THRESHOLD
Overcurrent threshold – high
alarm
Off
to CT full scale value (settable
to 3000)
LD.AMP
LOAD CURRENT
Measured load current
L3 if CT input
enabled
LK.AMP
LEAK CURRENT
CT input leakage current
L3 if CT input
enabled
CT.MTR
CT METER
RANGE
To set the range of the meter.
3208 and 3204 only.
0 to 1000
L3
9.2.1
Analogue Representation of Current
Alarms
The meter is available in 3208 and 3204 controllers only.
Leakage
current
Load
current
High
current