When the deposit accumulates in the STP pump, with the increase of the STP pump operation hours,
the rotor balance is lost and the imbalance increases gradually. An increase in the amount of deposit
may lead to a malfunction of the STP pump. Perform the overhaul ahead usual case.
The setting value of the imbalance is fixed, and the user cannot set it.
Set the "WARNING" function of the Enable/Disable to disable to release the "Imbalance X_H",
"Imbalance X_B" or "Imbalance Z". (see Section 3.11, "Parameter set mode")
8.3.5 Pump run time over
The totalising counter adding up the rotation hours is installed in the SCU-1601.
The counter value can be confirmed on the LCD. (see Section 3.10, "Confirmation mode")
"Pump Run Time Over" is displayed when the counter value attains the setting value. When deposit
accumulates inside the STP pump, this function can be used to consider the time of the overhaul. The
setting value is user-definable. Refer to Section 3.11, "Parameter set mode" for the setting method.
"Pump Run Time Over" warning can be reset by setting the warning function to disable after it is
occurred. (see Section 3.11, "Parameter set mode")
8.3.6 Pump overload
"Pump Overload" is displayed when the state that the motor current exceeding the setting value
continues during the fixed time. The state that the STP pump rotational speed drops below the setting
value continues during the fixed time. However, the motor current and the rotational speed are
monitored only in the NORMAL state.
When the deposit accumulates in the STP pump, the load in NORMAL state may gradually grow with
the operating time. Considering the time of the overhaul, this "WARNING" function can be used.
The current setting value and rotational speed setting value are user-definable. "Pump Overload"
warning can be released by setting the warning function to disable after it is occurred. (see Section
3.11, "Parameter set mode")