8
TAbLE 1: relay designations for Vaporizer Alarms and relays
Parameter
Terminal
Gas Pressure
AO1
Gas Temperature
AO2
Superheat Temperature
AO3
Control Water Temperature
AO4
Auxiliary Water Temperature
AO5
Expansion Chamber Switch
DI3
Pressure Relief Valve Switch
DI4
* Wired from the factory.
NOTe: The electronic pressure reducing valve relays are energized relays and thus recommended
normally open.
TAbLE 2: 4-20 Output designations
NOTe: All outputs must also be wired to the appropriate V- (GND) terminal.
4.3 Modbus Information
The VPH-10000 can also communicate with a SCADA system using Modbus RS-485 communication.
The baud rate, node number and data format of the VPH-10000 must match that of the master SCADA
system. See Section III.5 for information on how to accesses and edit these features. A table of
Modbus integers and their corresponding parameters can be seen in Table 3. For more information
on configuring Hydro Instruments equipment onto SCADA systems, please refer to the Modbus
Installation and Instruction manual.
Vaporizer Alarm/Relay
Board Number
Relay Number
Recommended Wiring
Electronic Pressure
Reducing Valve 1
CB-8RELAY
1
N.O.
*Refill Solenoid
CB-8RELAY
2
N.O.
*Circulation Pump
CB-8RELAY
3
N.C.
*Magnetic Contactor
CB-8RELAY
4
N.O.
Electronic Pressure
Reducing Valve 2
CB-8RELAY
5
N.O.
Superheat Alarm
CB-8RELAY
6
N/A
High Pressure Alarm
CB-8RELAY
7
N/A
Water Level Alarm
CB-8RELAY
8
N/A
Low Water Temperature Alarm
CB-2RELAY
1
N/A
High Water Temperature Alarm
CB-2RELAY
2
N/A
