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18 Part number HA028582. Issue 6.0 May-07
2.12
Current Transformer
The current transformer input is an optional input in
all model sizes.
It can be connected to monitor the rms current in an
electrical load and to provide load diagnostics. The
following fault conditions can be detected: SSR (solid
state relay) short circuit, heater open circuit and partial
load failure. These faults are displayed as alarm
messages on the controller front panel.
☺
If EIA422 digital communications is fitted,
Current Transformer Input is not available.
Note: Terminal
C is common to both
the CT input and Digital input A.
They are, therefore, not isolated from
each other or the PV input.
•
CT input current: 0-50mA rms (sine wave,
calibrated) 50/60Hz
•
A burden resistor, value 10
Ω
, is fitted inside the
controller.
•
It is recommended that the current
transformer is fitted with a voltage
limiting device to prevent high voltage
transients if the controller is
unplugged. For example, two back to
back zener diodes. The zener voltage should be
between 3 and 10V, rated at 50mA.
•
CT input resolution: 0.1A for scale up to 10A, 1A
for scale 11 to 100A
•
CT input accuracy: +4% of reading.
CT Input
CT
C
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