Secondary PSU PWR-C2-250WAC for C3650

[johnlloyd_13]

hi,

i would like to use PWR-C2-250WAC as secondary PSU for a 3650 switch.

the switch will have no PoE endpoints.

can anyone confirm the said PSU is compatible to be used as secondary power. see table 3 from below link:

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3650-series-switches/datasheet-c78-729449.html

Table 3.       Switch Models and Corresponding Default Power Supplies

Models	Default Power Supply	Available PoE Power	Support Secondary Power Supply
24-port data switch	PWR-C2-250WAC	-	Yes
48-port data switch	Yes

[Marvin Rhoads]

Can you confirm the exact model of your 3650 switch?  "show inventory" output would be ideal. 

[johnlloyd_13]

hi marvin,

i actually tried the said PSU on the secondary slot but i'm not sure it went faulty (PS OK got no light) or whether it's a compatibility issue. i'm leaning towards the former.

#sh inv
NAME: "c36xx Stack", DESCR: "c36xx Stack"
PID: WS-C3650-48PS , VID: V03 , SN: FDO194xxx

NAME: "Switch 1", DESCR: "WS-C3650-48PS"

PID: WS-C3650-48PS , VID: V03 , SN: FDO1947E0YQ

NAME: "Switch 1 - Power Supply A", DESCR: "Switch 1 - Power Supply A"
PID: PWR-C2-1025WAC , VID: V02 , SN: DCB192yyyy

#sh envi power
SW PID Serial# Status Sys Pwr PoE Pwr Watts
-- ------------------ ---------- --------------- ------- ------- -----
1A PWR-C2-1025WAC DCB192xxx OK Good Good 1025
1B PWR-C2-250WAC DCB204zzzz Disabled Bad Bad 250

Aug 31 23:32:37.977: %NGWC_PLATFORM_FEP-6-FRU_PS_OIR: Switch 1: FRU power supply B powered on
Aug 31 23:32:37.978: %NGWC_PLATFORM_FEP-1-FRU_PS_SIGNAL_FAULTY: Switch 1: signal on power supply B is faulty
Aug 31 23:32:37.978: %NGWC_PLATFORM_FEP-1-FRU_PS_INCOMPATIBLE: Switch 1: power supply B is incompatible and will be turned off
Aug 31 23:32:39.991: %NGWC_PLATFORM_FEP-6-FRU_PS_OIR: Switch 1: FRU power supply B powered off
Aug 31 23:47:57.169: %NGWC_PLATFORM_FEP-6-FRU_PS_OIR: Switch 1: FRU power supply B removed
Aug 31 23:48:01.183: %NGWC_PLATFORM_FEP-6-FRU_PS_OIR: Switch 1: FRU power supply B inserted
Aug 31 23:48:01.183: %NGWC_PLATFORM_FEP-6-FRU_PS_OIR: Switch 1: FRU power supply B powered off
Aug 31 23:48:17.298: %NGWC_PLATFORM_FEP-6-FRU_PS_OIR: Switch 1: FRU power supply B powered on
Aug 31 23:48:17.298: %NGWC_PLATFORM_FEP-1-FRU_PS_INCOMPATIBLE: Switch 1: power supply B is incompatible and will be turned off
Aug 31 23:48:19.310: %NGWC_PLATFORM_FEP-6-FRU_PS_OIR: Switch 1: FRU power supply B powered off

[Marvin Rhoads]

I'm pretty sure it is incompatible. I couldn't find a citation saying so explicitly; but I built a configuration in Cisco's ordering tool and it only lets me choose the 640w or 1025w power supply as secondary in that model. (640w is the default base power supply.)

[johnlloyd_13]

hi marvin,

cisco white paper sometimes is confusing.

i tried on a 3850 a secondary PSU with the lowest wattage and works fine not sure why it wouldn't work the same on a 3650.

i'll try using a 640W PSU on slot B.

[sbhadrav@cisco.com]

The switch operates with either one or two active power supply modules.

You can use two AC modules, two DC modules, one AC and one DC module, or one module and a blank cover.

Note: In a NEBS installation, you can use two DC modules or one DC module and a blank cover.

All switches ship with a blank cover in the second power supply slot if switches are configured with only one power supply.


Table 1 Table 1 describes the supported internal power supply modules.

Table 1 Power Supply Module Part Numbers and Descriptions
Part Number    Description
PWR-C1-1100WAC=    1100-W AC power supply module
PWR-C1-715WAC=    715-W AC power supply module
CPWR-C1-440WDC=    440-W DC power supply module
PWR-C1-BLANK    Blank cover
PWR-C2-1025WAC    1025-W AC power supply module
PWR-C2-640WAC    640-W AC power supply module
PWR-C2-250WAC    250-W AC power supply module
PWR-C2-640WDC    640-W DC power supply module
PWR-C1-BLANK    Blank cover

For information on available PoE, see these sections:

• (available PoE with AC power supply)

• (available PoE with DC power supply)

• (switch power supply requirements for PoE and PoE+, and Cisco UPOE™)


The input voltages of the power supplies are as follows:

• The 250-W, 640-W and 715-W AC power supply modules are autoranging units that support input voltages between 100 and 240 VAC.

• The 1025-W and 1100-W AC power supply modules are autoranging units that supports input voltages between 115 and 240 VAC.

• The 440-W and 640-W DC power supply modules have dual input feeds (A and B) and supports input voltages between 36 and 72 VDC. The output voltage range is 51 to 57 V.


Each AC power supply module has a power cord for connection to an AC power outlet.

• The 640-W, 715-W, 1025-W and 1100-W and modules use a 16-AWG cord (only North America). All other modules use an 18-AWG cord.

• All other modules use an 18-AWG cord

• The DC power supply module must be wired to a DC power source.