8
TAbLE 1: relay designations for Vaporizer Alarms and relays
Parameter
Terminal
Range
Gas Pressure
AO1
0 - 300 psi (21 bar)**
Gas Temperature
AO2
0 - 121°C (32 - 250°F)
Superheat Temperature
AO3
0 - 121°C (32 - 250°F)
Control Water Temperature
AO4
0 - 121°C (32 - 250°F)
NOT USED IN MODEL VPH-10000-2
AO5
-
Expansion Chamber Switch
DI3
closed = alarm
Pressure Relief Valve Switch
DI4
closed = alarm
* Wired from the factory.
TAbLE 2: 4-20 Output designations
NOTe: All outputs must also be wired to the appropriate V- (GND) terminal.
**Pressure range can be adjusted but must match the pressure transducer's specifications.
4.3 Modbus Information
The VPH-10000-2 can communicate with a SCADA system using Modbus RS-485 communication.
The baud rate, node number and data format of the VPH-10000-2 must match that of the master
SCADA system. See Section III.5 for information on how to access 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.
Not used
CB-8RELAY
3
-
*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