The AQM 65 is powered from mains AC, 240 or 110 VAC.
An AC switch box inside the enclosure distributes mains power to two 12V DC power supplies:
- Power supply 1 powers the ePC, pump and all the modules.
- Power supply 2 powers the thermal management system, including the compressor, internal heater and fans.
The AC switch box is located behind the front panel.
Main power (earth, ground, power) is wired here.
Power supply 1
Power supply 1 powers the ePC, pump and all the modules.
The output from power supply 1 goes straight inside the enclosure and connects to a 12V rail. The positive (red) lead is connected through the 5A fuse.
The fuse can be used as an on/off switch. Pulling this fuse turns off the entire monitor but leaves the compressor fan on (the fan is powered by a different power supply).
Power supply 2
Power supply 2 powers the thermal management system, including the compressor, internal heater and fans.
The output from power supply 2 connects to the 12 Volt DC switch box behind the back panel.
Here’s an electrical schematic for the 12V switch box:
The (SMCABLE36) connections on the left side of the switch box come in from the system manager module inside the enclosure.
These connections connect to relays which switch on and off the fans and heaters.
The top relay is not used and can be a spare. But it can’t be removed because it’s soldered in place. Wires from another relay (if one has failed) can be moved up to this relay.
The second relay controls the fan at the back of the monitor. If the outside temperature is above 3oC , this relay will be charged and the fan will be on.
The third relay controls the heaters. If the temperature set point is above the outside temperature, this relay is charged and the heaters are on.
The compressor (for cooling) is powered by 12V from the white (power) and brown (ground) wires. There is always 12 Volts across these wires. These wires are connected to the DC box at the back to the control box at the front .
The compressor is controlled (on/off) by the yellow and green wires. These wires are connected to the DC box at the back to the control box at the front.
