Three Phase and Three Phase CT Type PMSFL User Manual - 11
NOTE: In the sense of security, setting the CT changing-ratio can only be done after the power is
on. Any related operation will be null after
disappears .
Connecting to the securityProbe and Ports 9 and 10 (RS485)
Connect two wires/twisted pair from ports 9 and 10 to the terminal block on the
securityProbe RS485 port.
The AKCP PMS uses the Modbus connection (RS485) port on the rear of the
securityProbe (note your rear panel may differ depending on the model of securityProbe
you have) Using a pair of wires from ports 9 and10 on the PMS (see wiring diagram) to
the terminal block on your securityProbes RS485 port.
VERY IMPORTANT:
On the
interconnection between the +/- on the securityProbe unit and the A B on the PMS, The
A goes to - while the B goes to + .
VERY IMPORTANT NOTE
: You need to connect the AC POWER TO THE PMS
FIRST before connecting it to the securityProbe base unit and adding the meter to the
web interface.
The PMS should ONLY be installed by a qualified Electrician
Engineer who is also familiar with Modbus.
RS485 Cabling and Run Length
All Modbus manufacturers recommend a cable with 120Ohm characteristic impedance
or higher so we highly recommend that you use shielded AWG 24 twisted pair copper
wire and this cable has an impedance of at least 120Ohm, most importantly when
connecting multiple PMS to a single base unit. The maximum cable length is
determined by the combination of cable length (in meters) and data signaling rate. The
data signaling rate on the power meter is 9600 bps (bits per second), so the maximum
cable run length for this cable is roughly 300 meters, or 1000 feet.
Connecting Multiple PMS to a single securityProbe base unit
