PQube 3 Installation Manual
Manual#: 851-000135
Version 3.4 – 08/11/2022 Page 22 of 47
2.2.5 Connect PQube 3 to the power supply
Your PQube 3 can take its operating power from four different sources:
• 24 Vac or ±24 to 48 Vdc power supply terminals on PQube 3
• Power over Ethernet (PoE)
• Optional PM1/PM2 Power Supply module
• Rechargeable UPS module (automatically provides up to 30 minutes of battery backup
when the main power supply source drops out)
PQube 3 power supply terminals
The instrument power terminals (45 and 46) on the front of your PQube 3 must be connected to 24
Vac (±20%) or 24 to48 Vdc (±20%), supplied by a certified isolating power supply.
WARNING: Applying voltages outside of this range can
cause permanent damage to your PQube 3.
Polarity does not matter. Also, your PQube 3 provides a
minimum of 150 V of transformer-based isolation
between these terminals and all other terminals,
eliminating any problems with ground loops.
Power over Ethernet (PoE)
Plug in an Ethernet cable leading to a 48 V PoE source (PoE switch/hub/router or PoE injector).
If no other power sources are available, your PQube 3 will request power from the PoE switch.
If your PQube 3 is already powered from another source (24 Vdc power supply or PM1/PM2 power
supply module, for example) then it will not request power from the PoE switch when you plug it in.
PM1 or PM2 Power Supply Module
The PM1 or PM2 module accepts a range of 100 to 240 Vac, 50/60/400 Hz. It plugs into the right
side of your PQube 3. This module is ideal for applications where 24 to 48 Vdc, 24 Vac, and PoE are
not available. Ensure your AC source can supply at least 20 W.
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