INSTRUCTION MANUAL
P.19
PM32U
OFF
Alarm (abnormal high level)
ON (2nd Unit)
ON (1st Unit)
Alarm (abnormal low level)
Fig. 17 Two-Unit Alternating Operation
5. Operation
5.1 Operational Limitations
This pump is designed to operate under the following conditions:
(1) Liquid temperature : max. 40
º
C (104 F
）
(2) Liquid : This pump must not be used with sea water and corrosive chemicals
or combustible liquids.
(3) Lowest liquid level : Refer to lowest liquid level shown in the technical
document.
(4) Voltage variations : The motor is designed to supply its rated output at
variations of up to 10% of the rated voltage at the rated frequency.
(5) Voltage balance : Balance among the supply phases should not exceed
deviations in excess of 1%.
(6) Frequency variations : The motor is designed do supply its rated output at
variations of up to +3%
／
-5% of the rated frequency at the rated voltage.
(7) Frequency of starts : The pump should not be started in excess of 15
times per hour for 4 pole and 6 pole 50hp to 145hp, 10 times per hour for 4
pole, 6 pole and 8 pole 175hp to 245hp and 10 pole 50hp to 145hp.
