M-Controller II System Operation Manual - 9 -
84350-201-001 Rev C
4.2 Cabling
Approved cable conduit and conduit connectors should be used to ensure a safe and
reliable installation. Check the local wiring code for more information. Make sure all
conduit connectors are screwed in tight and that they are not coming in contact with any
bare conductor.
Strain relief should be installed to the enclosure to prevent any mechanical stress from
being transmitted to terminals and internal connections.
We recommend using BELDEN 9841 for communications. This wire has 120 ohms input
impendence, which will eliminate RS-485 communication problems.
QEL warrantees and support only covers installation with proper cable. If in doubt
please contact QEL support personnel.
4.3 Connectors
The terminal block TB1 to TB18 accept 12 AWG to 24 AWG wire, Use 16 AWG or 18
AWG wire for Power Supply in long wiring runs, which can be up to 1km (1,000 meters)
long.
Make sure to observe wiring to the correct terminal blocks. Removable terminal blocks
are provided. Make sure there is no confusion about which terminal block to wire to.
Note: Incorrect wiring to any of the terminals of the M-Controller
could cause permanent damage to the unit, which is not
covered by the warranty. Incorrect wiring could also cause
fire, electric shock, or bodily injury. Please observe the polarity
on all connections.
Warning: Disconnect the mains supply and switch off the M-Controller
when changing any of the wiring to the unit. Be especially
cautious when wiring high voltage to the relays. Do not touch
sensitive components on the circuit card to prevent static
discharge damage to the unit.
4.4 Power Requirements
The M-Controller power supply voltage requirements are nominally 24VAC or 24VDC
NOTE: M-Controller II has full-wave rectifier and half-wave rectifier circuit on board
for flexibility. You will damage devices if you mix half wave and full wave rectifiers on
the same AC source. Use extreme caution when sharing a common AC source. Sharing a
common DC source is less problematic.
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