PMP Synchronization Solutions User Guide
Installing a CMM4
PMP-0297 007v001 (January, 2017)
3-57
Discontinued power supply notice – ACPS112WA only
The following procedure is only applicable to operators using a CMM4 that supplies power to
both 30V devices (PMP100 radios) and 56V devices (PMP430 or PMP320 radios). The discontinued
30V model ACPS120WA power supply does NOT require the 1k 5W resistor on the CMM4 29V
terminals (This new 30V power supply was made available for order around December 3, 2010).
The phased-out 30V model ACPS112WA power supply will always require a 1k 5W resistor when a
56V supply is present. Since both power supplies look identical, see the label under the power
supply to identify the model.
Power supply model ACPS112WA (discontinued) requires a 1k 5W resistor across the 30V DC
input terminal of the CMM4 when both 30V AND 56V are present. Doing so will prevent the 30V
power supply to not always come out of sleep mode with a light load. The power supply will
attempt to come out of sleep mode, and if it does not see sufficient load it goes into a
sleep/recovery cycle that is observable by watching the 30V LED on the port connector turn on
and off.
Power supply Model ACPS120WA (discontinued) satisfies the European Union's Energy Level 5
requirement and DOES NOT require a 1k 5W resistor.
If using both 30 VDC (discontinued model ACPS112WA only) and 56 VDC power, to ensure correct
operation under all conditions a 1000 Ohm 5 W resistor must be installed across the 30 VDC +V
and GND (ground/return) at the terminal block using
. The resistor can be purchased
locally or call technical support to obtain one.
The resistor prevents the model ACPS112WA 30 VDC converter (discontinued) from getting stuck
in sleep mode which can occur in dual-powered CMM4s and result in 30 VDC radios getting low
voltage and not booting.
If redundant 30 VDC power supplies are desired along with one or two 56 VDC power supplies,
connect one power supply to each of the 29 VDC terminal blocks using the resistor in one of the
29 VDC terminal blocks.
Procedure 12 Installing a special resistor for dual-powered CMM4s (30V model
ACPS112WA power supply only)
1
WARNING - Make absolutely sure 30 VDC and 56 VDC converters are unpowered
and disconnected from AC (Mains) before proceeding.
2
Ensure white and black 30 VDC leads have 1/2 in (1 cm) of stranded wiring exposed.
Strip or cut to 1/2 inch if needed.
3
Wrap the stranded wires of the 30 VDC white lead around one of the leads of the
1000 Ohm 5 W resistor.
4
Wrap the stranded wires of the 30 VDC black lead around the other resistor lead.
