Potter PFC-7500 Series - Manual (Page 11)

7
5.1 Installing the Transformer
The transformer requires an unswitched 120 VAC 60 Hz electrical outlet with at least 350mA of available current. Never
share the transformer output with any other equipment. The 120 VAC circuit is not power limited.
To mount the Model WLT Transformer to a single-gang box adjacent to the PFC-7500 Series enclosure, follow the steps
below. Refer to Figure 6 as needed.
1. Remove the lower knockout from the PFC-7500 Series enclosure.
2. Attach a single-gang box adjacent to the PFC-7500 Series enclosure.
3. After the single-gang box is secured, attach the transformer to the junction box, using the bottom box’s bottom
knockout. The screw on the transformer should extend into the single-gang box.
4. Tighten the screw to secure the transformer to the junction box .
5. An electrician must then connect the black and white
leads on the transformer to an unswitched 120 VAC 60 Hz
electrical outlet with at least 550mA of available current.
6. Connect the wires from the bottom (the side opposite
the attaching screw) two terminals on the transformer
to terminals 1 and 2 on the panel. Use no more than 70
ft. of 16-gauge wire or 40 ft. of 18-gauge wire between
the transformer and the PFC-7500 or PFC-7501 panel.
5.2 Terminals 1 and 2
AC Transformer Input
The transformer provides up to 500mA of auxiliary current
for the PFC-7500 Series panels. The total current available
is limited by the total battery standby requirements of
the installation. See the Power Requirements section for
standby battery calculations.
Note: After power is applied to the PFC-7500 Series panel, any SNM Notification Modules connected to the panel
display Bell Trouble for 20 seconds.
DC Power Input to AC Input
When powering the PFC-7501/SL panel from the 12 VDC output of an FACP, connect the positive wire to the positive
battery terminal of the PFC-7500 Series and the negative wire to the negative battery terminal of the PFC-7500 Series.
When powering the panel from the DC output of a 24 Volt Fire Alarm Control Panel (FACP), connect the positive
wire from the FACP to terminal 1 and the negative wire to terminal 2. In order to power the PFC-7500 Series from the
12 VDC or 24 VDC of an FACP, the FACP must operate as a grounded control panel. If the FACP is a non-grounded
system, it may detect a ground fault when connected to the PFC-7500 Series panel AC or DC Input terminals. In this
case the PFC-7500 Series should be powered from a separate WLT wire-in transformer and not from the FACP.
Do not use battery backup with 12 or 24 VDC input: Do not connect any batteries to the PFC-7500 or PFC-7501 panels
when using the 12 or 24 VDC output from a FACP. The PFC-7500 Series panels use the backup battery capability of the
FACP for their standby requirements.
When powering the PFC-7500 or PFC-7501 panel from the 24 VDC output of a FACP, the following features are
disabled:
• Bell Output on the PFC-7501
• AC test (PFC-7500 Series)
• Battery test (PFC-7500 Series)
Always ground the panel before applying power to any devices: The PFC-7500 Series panels must be properly grounded
before connecting any devices or applying power to the panels. Proper grounding protects against Electrostatic Discharge
(ESD) that can damage system components. See the Earth ground section.
Maintain 1/4"
spacing bet ween
battery leads
and power
limited wir ing.
Figure 6: Transformer Installation
Primary Power Supply