Edwards nRVi, Инструкция по эксплуатации

Страница: 45 / 100

4.8 Connect the parallel control and monitoring
Connections for parallel control and monitoring must be made using a suitable mating
half that is not supplied.
CAUTION:
If using the normal and fail lines to drive the coils of d.c. relays, include a back EMF
suppression diode in parallel with each relay coil to protect the pump.
1. Connect the customer control equipment to the control input pins of the customer
logic interface mating half. Refer to Table: Logic interface connector pins on page
25 , which identifies the logic interface connector pins.
2. The control inputs are Start and Standby speed. To activate either of these control
inputs, connect the Remote control input (pin 14) to the 0 V reference (pin 2). To
start the pump, connect the Start / Stop control input (pin 3) to the 0 V Reference
(pin 2). To stop the pump, break the connection between pin 3 and pin 2. To put
the pump into standby, connect both Standby control input (pin 4) and Start / Stop
control input (pin 3) to the 0 V reference (pin 2).
Note:
Serial enable is also a control input but is not required in a system operating purely
under parallel control. Make sure that there is no connection to serial enable (pin
5).
3. To monitor the normal status output, connect the customer control equipment to
the normal status output (pin 15) and to the 0 V reference (pin 2) of the customer
logic interface mating half.
The output can be used to control other devices in the pumping system. The
output can drive a low power relay of up to 24 V d.c. coil rating (up to 20 mA).
4. To monitor the fail status output, connect the customer control equipment to the
fail output (pin 7) and to the 0 V reference (pin 2) of the customer logic interface
mating half.
The output can be used to control other devices in the pumping system. The
output can drive a low power relay of up to 24 V d.c. coil rating (up to 20 mA).
Page 41
A65901880_D - Installation