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Installation
B722-40-880 Issue F
The DX pump can be controlled using a hardware parallel control interface and via commands sent over a serial
interface.
If the DX pump is controlled using the hardware Parallel Interface, refer to Section 3.6 for more information. If the
Serial Interface is used, see the instructions given in Section 3.7. The logic interface provides the facility to work in
either Parallel or Serial control modes, however, commands cannot be sent in both modes simultaneously (refer to
Section 3.7.6).
3.5.5 Connect the electrical supply
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.
Refer to Figure 8 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)
between 0 V and earth.
Refer to Table 10 - Logic Interface Connector Pins when connecting the electrical supply to the customer connector
mating half.
This product requires a separate power supply (not included). The power supply should be
adequately protected against a hazardous live condition (for example, in case of a short circuit).
Incorporate a suitable isolation device in the electrical supply. Locate the switch in an easily
accessible position and mark it as the disconnecting device for the DX pump. If an isolation device
is not provided, it will not be possible to switch off the DX pump in an emergency.
Incorporate a suitable fuse or current limiting device, as specified in Section 2.8, in the 24 V
supply line to the DX pump. If a fuse is not provided and a fault develops, the DX pump may develop
a hazardous surface temperature or present a fire hazard.
Do not exceed the maximum supply voltage. Excessive supply voltage will cause permanent
damage to the control electronics and may result in a mechanical hazard in some failure
conditions.
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