7. APPENDIX A: User Interface
7.1. Terminal Block 1
1)
10V reference: This a 10V reference voltage for available for connecting to a
potentiometer remotely. Terminal 1 to top of the pot, terminal 2 to the wiper and terminal
3 (ground) to the bottom of the pot.
2)
Remote Power Reference: When SW301, the INT/EXT switch is set to EXT, the voltage
level at this terminal controls the command reference. O volts is minimum, and 10 volts
is maximum. A PLC can be connected to terminal 2 with its reference to terminal 3.
3)
Reference Ground: Used with terminals 1 & 2, the ground for the power reference.
4)
AFBK Auxiliary Feed Back not currently active.
5)
Common for AFBK.
6)
Flow : by shorting to common can be used to disable internal pressure switch.
7)
Common for Flow.
8-10) This is an RS485 Port. It is configured to be asynchronous, half duplex with an 8 bit, 1
stop bit format. This is a dedicated protocol. The baud rate is selectable to from 2400
baud to 38400 baud.
8)
Terminal A of the RS-485 port.
9)
Terminal B of the RS-485 port.
10)
Common for the RS 485 port.
7.2. Terminal Block 2
See section 5.4. on page 14 for more information on enabling these connections.
1)
START/STOP: Connecting terminal 1 to terminal 5 will start the unit. This is enabled
when E-H is set to EN and the HEAT switch is ON.
2)
E-STOP: Opening a connection between terminal 2 and terminal 5 will stop the heat
cycle. This is enabled when E-S is set to EN. This will not activate the shunt trip. The
front panel E-STOP switch remains in circuit.
3)
AUX: A user defined trip can be wired between terminals 3 and 5. Enabled when E-A
is set to EN.
4)
RESET: Connecting terminal 4 to terminal 5 will issue a fault reset. This is always
enabled.
5) COMMON
6) Not
used
7-10) 7, 8, & 9 are normally open relay connections with 10 being common for all relays.
7)
HEAT ON:
Connected to COM when HEAT cycle is on.
8)
FAULT:
Connected to COM when a FAULT occurs
9)
READY:
Connected to COM when the HEAT cycle is off and no faults exist.
10)
COM:
Common connection for the relays
The contacts for these relays are rated at 250V, 3A.
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