Why doesn't CRS share power load?

[ปลาวาฬทราย RMUTT CPE IX]

RP/0/RP0/CPU0:CS#adm sho env pow
Thu Jul 14 15:07:56.447 THA
                Power-Supply            Voltage         Current
                  AC-REC                  (V)             (A)
                    1:                  54.127           5.200
                    2:                  53.655           1.400
                    3:                  54.390           1.600
                    4:                  54.390          13.200

 Total Current:   21.400 A
 Total Power  : 1161.549 W

While another quite shares.

RP/0/RP0/CPU0:b1#adm sho env pow
Thu Jul 14 15:10:04.413 BKK
                Power-Supply            Voltage         Current
                  AC-REC                  (V)             (A)
                    1:                  53.827           8.400
                    2:                  54.375           7.600
                    3:                  54.082           8.400
                    4:                  54.320           6.600

 Total Current:   31.000 A
 Total Power  : 1678.197 W

Is this normal behavior of CRS?

[mivens]

If you are using the fixed power system, the CRS has different power zones.

See http://www.cisco.com/c/en/us/td/docs/routers/crs/crs1/16_slot_lc/system_description/reference/guide/qsysdsc/sysdsc2.html#86923

For example, the CRS-16 below only has one linecard in zone 4 (slots 8-11)  but three cards in zone 1(slots 0-3).

RP/0/RP0/CPU0:CRS(admin)#show environment power-supply
          Power Module   Voltage   Current
         AC-REC AC-REC   (V)          (A)
Rack 0:
 Zone 1: [A0], [B0] 55.392, 55.623 7.233, 10.931
 Zone 2: [A0], [B0] 55.623, 55.835 5.938, 6.185
 Zone 3: [A1], [B1] 55.026, 55.430 0.924, 2.383
 Zone 4: [A1], [B1] 55.797, 54.679 1.520, 1.561
 Zone 5: [A2], [B2] 56.009, 55.122 6.781, 4.417
 Zone 6: [A2], [B2] 55.103, 54.428 2.691, 2.116