Page 49
VP-X Installation and Operating Manual
Rev. D (August 5, 2020)
5.25
TCW Integrated Back-Up Battery System
The TCW Integrated Back-Up Battery System (IBBS) can be used with the
VP-X. Section 5.25a applies to 2/4ah wiring and Section 5.25b applies to
3/6ah wiring.
5.25a TCW IBBS 2/4ah Wiring
There are two ways to wire the TCW IBBS 2/4ah, depending on if the
protected device has one or two power inputs.
Pin 1 is used to charge the internal IBBS battery.
Pin 6 is used as a power source for the device wired to pins 7, 8, or 9.
If the device has a single power input like a TruTrak Gemini or Garmin
430/530/650/750 then use option 1.
If the device has dual power inputs, then use option 2.
Option 1:
This method wires the IBBS charge circuit and the circuit that carries the
device load (the device that is getting backup power like an EFIS or radio)
separately from two separate pins on the VP-X. In this manner the load
circuit can be protected separately from the charge circuit. Wire pin 1 and pin
6 from the IBBS into separate power pins on the VP-X. Set the circuit breaker
value for the circuit that goes to pin 1 on the IBBS to 5 amps, and set the
circuit breaker value for the wire that goes to pin 6 to the value recommended
by the device manufacturer.
+
-
Batt
Pin 1: Powers IBBS charging circuit. Set to 5A breaker value.
Pin 6: Powers load only. Set CB value for load.
VP-X
IBBS
CPC
Connector
2
1
6
7
Starter
Contactor
Battery
Contactor
Set CB for load.
To Device
2A
5A
Option 2:
This method uses the IBBS solely as a backup power supply to a device that
has dual power inputs (like most EFIS displays).
+
-
Batt
See IBBS instructions
for further detail
VP-X
IBBS
CPC
Connector
2
1
6
7
Starter
Contactor
Battery
Contactor
2A
5A
Not used
EFIS
Pri Pwr
BU Pwr
Notes
Locate the 2A fuse as close to the source of power as possible.
The other pinouts on the IBBS are shown in the TCW IBBS
installation manual. Only the power inputs are shown here for
clarity.