Watson Marlow Pumps 621 Trio, Manual

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4. Using external analogue control
(a) Remove the four M5 cross-head screws on the inverter’s cover to access the electrical terminals (see Fig.2).
(b) Connect a 4.7 kW potentiometer to the control terminals as shown in Fig. 3 or apply a 0 - 10 V signal between pin 2 (0V) and
pin 3 (AIN+). In both cases, position jumper JP304 to connect 0V to AIN-.
(c) Ensure that a link is fitted between pin 5 (DIN1) and pin 1 (P10+).
(d) Check that voltage input is selected by ensuring that the jumper is fitted to JP301 (Fig 2).
(e) Refit the cover, tighten the cover screws to the correct torque and then apply mains power to the inverter.
(f) Turn the external potentiometer (or adjust the analogue control voltage) until the desired frequency is achieved. The unit
will not switch on until a minimum of 2 V has been applied.
(g) Turning the potentiometer counter-clockwise or adjusting the analogue control voltage below 2 V will slow the motor to a
stop.
Note: The frequency set by the external voltage is added to the frequency set by the internal potentiometer. A run/stop switch can
be used to start and stop the motor, or the direction of rotation can be changed by connecting the link to DIN2 instead of
DIN1.
5. Remote control using pre-set frequencies
For basic startup configuration, proceed as follows:
(a) Remove the four M5 cross head screws on the inverter’s cover to access the electrical terminals (see Fig. 2 and 3).
(b) Remove the link between pin 5 (DIN1) and pin 1 (P10+).
(c) Connect pin 5 (DIN1) pin 1 (P10+) via a simple on/off switch. This sets up the inverter for clockwise rotation (default). If
counter-clockwise operation is required, connect a switch between control terminals 6 and 1.
(d) Connect the OPm2 and set parameter P005 to the desired frequency setpoint.
(e) Set parameter P006 to 000 to specify digital setpoint.
(f) Set the external on/off switch to on. The inverter will now run at the frequency set by P005.
6. Remote control using RS485
Up to 31 Trios can be controlled via a 2-wire bi-directional RS485 serial link connected to the control terminals (see Fig 2 and
3), or the OPm2 socket on the side of the Trio. Baud rate 1200 to 19200 (set by parameter P092), serial line time-out 0-240
seconds (parameter P093).
Safety
Minimum speed running
The minimum safe speed to run the TRIO is 5Hz.
Fault finding
If the motor does not start up check the LEDs on the side of the inverter:
LED State TRIO Status
Green Yellow
ON ON Mains power on, inverter not running (STANDBY)
ON OFF Inverter running, as control commands (ON)
Flashing Flashing Current limit warning
Flashing ON Inverter over temperature
ON Flashing Motor over temperature
OFF ON Other fault (e.g. tripped)
OFF Flashing Mains under voltage
OFF OFF Mains supply fault (e.g. faulty external switch)
If a fault occurs: switch off, disconnect and then reconnect the power, and then switch on again. Switch off if the fault condition
persists. Trips can be reset by connecting a switch to DIN3 (Fig. 2 and 3).
If a warning occurs: switch off, disconnect and reconnect the power and then switch on again. If the fault/warning persists, further
investigation requires an OPm2 or a serial link connection.
If the OPm2 display shows a fault code, refer to Fault Codes.