Technical Data - Grundfos CU 321 Installation And Operating Instructions

6. Technical data

General electrical data
Supply voltage CU 321
Supply frequency
Max. imbalance on
supply voltage
Power factor
Number of mains on/off
Output frequency
Rated motor voltage
CU 321
Output current continuous [A]
Output current max. (60 seconds) [A]*
Max. cable cross-section, motor [AWG/mm
Max. cable length, motor [ft/m]
Input current 1 x 200-240 V [A]
Input current 3 x 200-240 V [A]
Max. cable cross-section, mains [AWG/mm
Weight excl. IP 21/NEMA 1 options [lbs/kg]
* End of curve protection. The output is reduced after 60 seconds indicating that the pump is running at the
end of the curve. The output will resume to normal operation when the load is reduced or after a period of
further 60 seconds.
Fig. 22 Control terminals in CU 321
24
1 x 208-240 V ±10%
3 x 208-240 V ±10%
50/60 Hz ±3 Hz
±2.0% of rated supply
voltage
0.90 / at rated load
Max. 2 times/min.
25-60 Hz
3 x 230 V
2
]
2
]
Pressure sensor input
Terminal number 60
Current level 4-20 mA
Supply for pressure sensor 24 VDC
Terminal number 12
Max. load 130 mA
Relay output
Terminal number
Max. terminal load (AC)
on 1-3, 1-2
Min. terminal load
on 1-3, 1-2
3 hp 5 hp, 1-phase
10.0 17.5
12.0 21.0
10/4 10/4
1300/400 1300/400
23.0 34
9.2 16.1
10/4 6/16
13.3/6.0 41.0/18.5
1-3 (NC), 1-2 (NO)
240 VAC, 1 A
• 24 VDC 10 mA
• 24 VAC 100 mA
5 hp, 3-phase
16.0
19.2
10/4
1300/400
–
14.7
10/4
13.3/6.0