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Page 23
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Installation
B722-40-880 Issue H
CAUTION
When connecting the DX pump to the power supply, ensure that all 3 pins for the 24 V connection and all 3 pins
for the 0 V connections on the customer connector mating half are connected to the power supply.
for a schematic diagram of the logic interface connections.
The electrical supply for the DX pump must meet the requirements of BS EN 61010-1 / C22.2 1010-1. Ensure that
hazardous voltages as defined in EN61010 cannot be present on the electrical interface to the DX pump.
The DX pump 0 V is not referenced to earth (ground). Ensure that the electrical supply offers a path (
≤
22 k
Ω
)
between 0 V and earth.
- Logic Interface Connector Pins when connecting the electrical supply to the customer connector
mating half.
Figure 6 - Logic interface connections - parallel mode
3.6
Parallel interface mode
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 DX pump.
1. Connect the customer control equipment to the control input pins o f the customer logic interface mating half.
, which identifies the Logic Interface connector pins. The control inputs are as follows:
Start
Standby Speed
To activate either of these control inputs, connect the control input pin to the 0 V control reference.
1. 24 V d.c. electrical supply
2. Fuse
3. Optional LED indicator - system OK
4. Optional LED indicator - normal speed
5. Current limit resistor for LED
6. DX pump logic interface
7. Start switch
8. Optional standby switch
9. Optional voltmeter
to monitor analogue output
