Q4 CONTROLLER II Operation and Maintenance Manual
Q4 Controller II Operation Manual
- 8 -
Dec 02, 2021
85350-101-000 Rev A
4.3 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 conductors.
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.
4.4 Connectors
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 Q4 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 main supply 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.
4.5 Power Supply Connection
The Q4 Controller power supply Voltage requirements are nominally 24VAC/DC.
NOTE: Q4
-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.
QEL supplies one standard transformer
M-Transformer 120 to 24 VAC 200 VA [QEL SKU#: 6500-0024]
