14
1.6.8 Master/Slave
System
For larger duties, VAPANET “Electrode boiler” units can be interconnected and arranged to operate from one proportional signal as a
Master/Slave system.
The system allows up to 4 LEC units (of equal duty) to be linked
in this way. The slave units will all be given a
demand signal from the master unit. The master unit, to which the proportional signal is connected, will be a “proportional” unit.
To “configure” a system, ensure that the control signal is zero [disconnect the control signal, or switch the units off at the front panel switch].
From the display select set up then network and confirm that you want to attach slaves the LEDs will flash red/amber/green, if not repeat the
procedure. Then press the service pin (network button) on each of the slave control PCB’s in the order that they are required to operate, the
slave user LED1 will flash Green/amber until it is configured, once the light goes out [or flashes red/off], proceed to the next slave. Once
this process is complete, check the screen shows the correct number of slave units then confirm the fact by pressing the OK button on the
on the master display
NB. The total cable length of the network (using the cable recommended by V.H.C.L. – Our part number 8040251) is 500 m and it
should be assumed that there is 1 m of cable in each unit of the “system” (including the “master”).
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Õ
Esc
Ø
×
Vapac
J2
V
ap
ac
p
ar
t n
o
1
1506
31
CR1
Net
J1
Vapac PART No. 1150630
16
CR6
1
Ne
t
CR
7
J6
J5
CR5
1
6
6
10
CR
3
16
J1
J2
J3
1
F2
CR1
1
F1
CR2
J4
1
8
CR4
1
16
Vapac PART No. 1150630
16
CR6
1
Ne
t
CR
7
J6
CR5
1
6
6
10
CR
3
16
J1
J2
J3
1
F2
CR1
1
F1
CR2
J4
1
8
CR4
1
16
J2
40K 48
K
J5
V
0V
CR2
CR
2
CR
2
A
B
A
B
located on low voltage rail
Customers terminals within unit
PCB for "Master" or
"Slave" unit with display.
J1 see section 1.9.1
Link if control
signal is mA
current only.
Network Coms,
LED
configuration
UCP1
resistor
Button
Network
9
V
ac
S
u
pply
slave unit.
slave unit.
"Slave 9" units.
PCB for "Slave 1" to
J1 see section 1.9.1
Not required for
Not required for
J1 see section 1.9.1
Remote Indications
as Volt-free contacts:
CR6 gives the following remote indications
Terminal 547 - Unit Run (normally open)
Terminal 546 - Unit Run (normally closed)
Terminal 545 - Unit Run (Common)
Terminal 544 - Unit Alarm (normally open)
Terminal 543 - Unit Alarm (normally closed)
Terminal 542 - Unit Alarm (Common)
D
isp
la
y if
fi
tted
Co
nne
cti
on t
o
Network Expansion to
slave units 2 to 9 or
other network
components.
FRONT VIEW OF 1150630 BOARD
resistor
UCP1
configuration
If unit is not fitted
with a display then
UCP1 configuration
resistor is fitted on
configuration board
1150634 which is
plugged into CR4
on the master unit.
Display & Keypad
(Optional)
Network LED
USER LED 1
Network Button
USER LED 2
