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Parallel Interface Operation
D374-20-880 Issue E
4 Parallel Interface Operation
4.1 Introduction
Use the parallel interface to monitor and control the dry pumping system as described in the following sections.
Where necessary, refer to the instruction manual supplied with your dry pumping system, and to the instruction
manual(s) supplied with other pumping system components.
4.2 Inputs
Note: At least 10 seconds must be allowed between successive set/reset inputs.
The parallel interface has nine inputs; use these to control the operation of the dry pumping system, as shown in
Table 4. In Table 4, the terms ‘set’ and ‘reset’ are used as follows:
On volt free inputs;
z ‘Set’ means that you close (link) the appropriate two pins of the input.
z ‘Reset’ means that you must open (unlink) the appropriate two pins of the input.
On voltage inputs;
z ‘Set’ means apply > 20V
z ‘Reset’ means apply < 5V
Table 4 - Parallel Interface Inputs
Input Pins Function Use
1
Voltage Input
A1 - 1 & 2
L1 - 10 & 23
MCM - 1 & 2
Both pumps on/off
*
*
If a mechanical booster pump has not been fitted then this function will only operate the dry pump.
Set the input to switch on the both pumps.
Reset the input to switch off both pumps.
2
Voltage Input
A1 - 5 & 6
L1 - 11 & 24
MCM - 15 & 16
Process / AUC On / Off Set the input to select ‘process off’.
Reset the input to select ‘process on’.
3
Volt-free Input
A1 - 15 & 16
T1 - 1 & 14
MCM - 5 & 6
Both pumps on/off
*
Set the input to switch on the both pumps.
Reset the input to switch off both pumps.
4
Volt-free Input
E73 - 1 & 9 Dry Pump On / Off Set the input to switch on the dry pump.
Reset the input to switch off the pump.
5
Volt-free Input
E73 - 2 & 10 Mechanical Booster On /
Off
†
†
The mechanical booster pump will not start unless the dry pump is on. The input is ignored if no
mechanical booster pump is fitted to the dry pumping system.
Set the input to switch on the booster pump.
Reset the input to switch off the pump.
6
Volt-free Input
T1 - 2 & 15
MCM - 13 & 14
Process / AUC On / Off Set the input to select ‘process off’.
Reset the input to select ‘process on’.
7
Volt-free Input
T1 - 4 & 17 Run Til Crash On / Off Set the input to select ‘run til crash’ on.
Reset the input to select ‘run til crash’ off.
8
Volt-free Input
T1 - 5 & 18 Auto / Fast Shutdown Set the input to select ‘Auto shutdown’.
Reset the input to select ‘fast shutdown’.
9
Volt-free Input
T1 - 3 & 16 Open / Close Gate Valve Set the input to open the gate valve.
Reset the input to close the gate valve.
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