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III.
Installation
Electrical Wiring
The standard MicroTron Timer controller has an internal regulated power supply that will operate in the range
of approximately 90 to 240 VAC on the incoming wiring. Output relay(s) are protected with a replaceable fuse.
Relay output voltage will equal the incoming line voltage.
Prewired units are supplied with a 6 AWG cable with a 3-wire grounded USA 5 volt plug for incoming power
and 8 AWG 3-wire grounded receptacle cords for all control relay outputs.
Conduit units are predrilled at the factory and supplied with conduit knockouts for easy hard wiring to supplied
connectors.
NOTE: Liquid tight fittings and some labeled signal leads are provided for all signal (low voltage)
connections, such as water meter, low drum level, flow switch and 4-20mA outputs.
!
WARNINGS:
1.
The controller should be connected to its own isolated circuit breaker, and for best
results, the ground should be a true earth ground, not shared. Wiring must be done
according to all applicable local codes.
2.
Power (line voltage) must be disconnected while making any connections. If power is
supplied to the unit, line voltage will be present on the relay cards.
3.
Low voltage signal wires (probes, flow switch, water meter, etc.) should never be run
in conduit with high voltage wires.
Conduit Connections for LCD Units
R
Pulse 1
B
Serial Line
R
Pulse 2
Connection
B
R
Pulse 3
B
R
Pulse 4
B
Bleed Meter
Eprom
R
Flow
B
R +12 VDC
B GND
Conductivity
Probe
R
B
Cond. Switch
W
OFF / ON
G
Cond.
Cal.
Logic Board
Actual connection present depend on options ordered. Drawing is for referce only.
LCD
R
Level 1
Contrast
B
R
Level 2
B
R
Level 3
B
R
Level 4
B
+ vdc for option 9
Water
Meter
SIGNAL
Input
GROUND
ADJ.
TP6
ISO
R
4-20
B
Out
Make/up
To 4-20
Cal.
Board
R
Make/up
B
Cond.
W
Probe
TP-5
G
-5
TP-1
-12
OFF
ORP
Test
OFF
ORP
Test
Green
TP-6 TP-7
Black
White
Ribbon
Red
Cable
for Relays
10
9
Make/up
Switch
2
1
Green
Relay 1
TP-3
1
White
GND
TP-4
Relay 1
+5
Black
TP-2
Red
+12
N.O N.C NET GRD
4
Relay / Power Card (REV D)
2
10
4
2
FUSE
1
9
Ribbon Cable
POWER SUPPLY
Relay 2
Relay 3
Relay 4
3
FUSE
N.O N.C NET GRD
N.O N.C NET GRD
Relay 2
N.O N.C NET GRD
Relay / Power Board
H
N
G
FUSE
POWER INPUT
Relay 5
5
FUSE
Relay 4
N.O N.C NET GRD
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