Watson-Marlow qdos 20, Инструкция по эксплуатации

Страница: 95 / 235

Remote stop input (J1A), 110 V logic
110 VAC-Stop input
Apply a signal of 85 VAC to 130 VAC across terminals AC1 and AC2 to stop the pump.
Polarity is not important.
In the default condition the pump will not run while this signal is applied. In manual and
analog mode, the pump will start when the signal is removed. The input can be configured
to act in the opposite way in the control settings menu.
Note: This input is logical OR with the contact dose input.
Contact
If contact mode is enabled the pump will commence a contact dose when an AC input is
applied across the terminals.
2.
AC1
1.
AC2
2
1
Speed: analog input (J4)
Analog
The analog process signal must be applied to the I/P terminal of the Analog connector
(J4). Ground to the GND connector of the same terminal. In Analog mode the pump set
speed will be proportional or inversely proportional to the analog input.
4-20 mA circuit impedance: 250 Ω.
Max current 40 mA
2.
GND
1. I/P
2
1
See also "15.1.6 Control settings 4-20 mA Output (Un model only)" on page 124
Speed: analog output (J3) (Un only)
4-20
mA
A current analog signal within the range 4-20 mA is available between the O/P (output) terminal and the
GND terminal. The current is directly proportional to the pump speed. 20 mA = maximum speed, 4 mA =
zero speed.
1.
O/P
There is also an option to match the scale of the 4-20 mA input if this has been reconfigured by the user.
This option is available in the Control settings menu.
2.
GND
Earth shielding terminals
A 4.8 mm spade terminal is supplied for earth shielding of cables. Earth can be connected to the terminal. There
are also two spring clamp terminals for additional earth connection.
Keep 4-20 mA and low voltage signals separate from power supply (AC or DC).
13 INSTALLATION: PART 4 (CONTROL CONNECTIONS AND WIRING) 95