The AEM33 is suitable for use with current transformers
(CTs) with 5A secondary output. Metering quality CTs of
Class 1 accuracy with a minimum rating of 2.5VA are
recommended.
Connections should be made according to the diagrams
above.
CAUTION:
The pulse output contacts are rated at 100mA AC/DC,
100V max. Under no circumstances should this rating be
exceeded.
The AEM33 is fitted with dual pulse outputs. Output 1
provides a pulse proportional to kWh, output 2 provides a
pulse proportional to kVArh. Each output has a telltale
l.e.d. on the front panel which flashes ‘on’ to indicate a
pulse being generated.
The pulse connections are as follows:
Pulse 1: Terminals 31 & 32
Pulse 2: Terminals 29 & 30
The contacts are volt free and therefore an external power
supply must be provided.
The RS485 output consists of 3 terminals (15, 16 & 17) at
the top left of the unit. These should be connected via the
correct specification cable to the data bus. (Refer to
Elcomponent for cable recommendations.) Terminal
connections are as follows:
15 = A 16 = B 17 = 0 V ( A&B are signal cables.)
NOTE: It is essential that the polarity is respected
when other units are connected to the bus.
When the instrument is powered up, the display will initially
show the internal software version, then after a few seconds
will start displaying measured values. The four buttons allow
the user to scroll through the available measurements.
ENERGY DISPLAYS
Press
to select kWh, kVArh and Hours Run display pages.
The Hours Run register accumulates the total time during
which the average 3 phase load current exceeds a preset
level. This is always displayed with a resolution 0.1 hour.
The percentage level of (l1+l2+l3) at which the Hours Run
register accumulates is user programmable from 1% to 100%
of full scale current.
Press
and together and hold for 2 seconds to reset
the hours run register.
3.1 CONNECTION OF THE CURRENT INPUT
3.2 PULSE OUTPUT CONNECTIONS
4 INSTRUMENT OPERATION & SET-UP
3.3 RS485 CONNECTIONS
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