4
III. Installation
Electrical Wiring
The controller has an internal regulated power supply that will operate in the range of approximately 100 to
240 VAC on the incoming wiring. Output relays are protected with a replaceable fuse. Relay output voltage
will equal the incoming line voltage.
Prewired units are supplied with a 16 AWG cable with a 3-wire grounded USA 120 volt plug for incoming
power and 18 AWG 3-wire grounded receptacle cords for all control relay outputs. Conduit units are
supplied with liquid tights and adaptors for easy hard wiring to supplied connector.
NOTE: Liquid tight fittings and some labeled signal leads are provided for signal (low voltage)
connections, such as water meter inputs.
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.
Logic and Relay Cards
Logic Board
Relay / Power Board (Rev. D)
Ribbon Cable
2
1
10
9
POWER INPUT
POWER SUPPLY
Relay 1
Relay 2
Relay 3
Relay 4
Relay 5
5A (R1)
5A (R3)
5A (R2)
5A (R4)
5A (R5)
NEU GND
N.O. N.C.
NEU GND
N.O. N.C.
NEU GND
N.O. N.C.
NEU GND
N.O. N.C.
NEU GND
N.O. N.C.
H
N
G
Rev. D
Mounting Instructions
Select a mounting location that provides the operator easy access to the unit and a clear view of the
controls through the cover of the controller. The location should be convenient to grounded electrical
connections, the needed sample line plumbing and is on a stable vertical surface.
WARNING: Avoid locations that expose the controller to direct sunlight, vapors, vibration,
liquid spills or extreme temperatures; less than 0°F (-17.8°C) or greater than 120°F (50°C).
EMI (electromagnetic interference) from radio transmissions and electric motors can also
cause damage or interference and should be avoided.
!
!
Summary of Contents for MICROtron MICRO-C
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