Xylem Water Solutions HomeProductsFlygt Monitoring & ControlsMonitoring relaysMiniCAS II
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ITT's Flygt MiniCAS II is a supervision relay for temperature and leakage sensors. It is designed for the 3000 series pumps up to model 3301 and for the mixer program.
A number of condition monitoring sensors are available for the Flygt pump range.
• Thermal switches for stator overtemperature.
• CLS for water in oil detection.
• FLS for the detection of liquid in the stator housing.
• FLS10 for detection of liquid in the inspection chamber in the new midrange pump series, eg 3153, 3171, 3202 and 3301.
The sensors can be used in any desired combination. For “Ex” certified pumps, only combinations involving thermal switches, FLS and FLS10 may be used.
On the front, there are three indication lamps, one for supply, one for temperature alarm and one for leakage alarm. For the communication between the pump and the MiniCAS II, only two wires are needed. The MiniCAS II is designed to be connected to a standard 11-pin socket. MiniCAS II is interchangeable with the original version of MiniCAS.
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Alarm conditions:
Overtemperature
If overtemperature in the stator windings occurs, the unit will turn the pump off and lock it out.
Relay contact status:
- Overtemperature relay contacts: 1-3 open, 1-4 closed;
- Leakage relay contacts: 11-8 closed; 11-9 open.
The power to the pump can be restored after the stator temperature has decreased to a point of safe operation and the thermal switches had closed. The MiniCAS II has to be manually reset.
Leakage
If a leakage is detected, after a 5 sec. delay an alarm will be activated or the pump will be shut down.
Relay contact status:
- Overtemperature relay contacts: 1- 3 closed, 1-4 open;
- Leakage relay contacts: 11-8 open, 11-9 closed.
Once the leakage clears, power is restored to the pump automatically.
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Test procedure
Refer to the CLS/FLS/MiniCAS II application guide for additional information (part no. below)
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| Part numbers |
MiniCAS II relay: 83 58 57 |
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| Brochures |
Technical specifications:  89 25 33. |
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CLS/FLS/MiniCAS II Installation and application guide part no: 89 24 72. |
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| Approvals: |
CE, C-UR (covering USA and Canada) and CSA |
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| Technical data |
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| Physical dimensions: |
Width: 33 mm (1.33 in,) |
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Height: 79 mm (3.11 in.) |
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Depth: 75 mm (2.95 in.) |
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| Environment: |
0C @ +50C (32°F +122°F), maximum 90% relative humidity |
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| Supply voltage: |
20-30 V AC (50-60 Hz) |
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23,5-30 V DC |
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| Indication: |
Yellow LED for presence of supply |
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| Relay contacts rating: |
5 A / 250 V AC |
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| Operation principle: |
Current sensing |
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| Voltage to sensor: |
12V DC ± 5% |
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| Values of operation (I = current measured by MiniCAS II): |
3 mA < I < 22 mA = OK condition |
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I < 3 mA = High temperature (or interruption) |
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I > 22 mA = Leakage (or short circuit), delay 10 sec. |
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| Leakage changeover contact |
11-8 Normally closed for interlock |
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11-9 Normally open, closes for alarm |
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Automatic reset |
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Red LED for indication - follows the relay |
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Red indication lamp on: Leakage |
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Red indication lamp off: No leakage |
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| Temperature changeover contact |
1-3 Normally open, closes for interlock |
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1-4 Normally closed for alarm |
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Manual reset (see below) |
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Red indication lamp on: Overtemperature |
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Red indication lamp off: Normal temperature |
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| Reset of temperature alarm |
External reset is possible either by connecting terminals 6 - 7 with an external push button or by interrupting the supply voltage. Note: in the 24 V version, reset is also possible between 6-2. |
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| An example of wiring diagram is shown in the picture below. |
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Leakage alarm will stop the pump
This installation can be used if the leakage alarm shall stop the pump.
It is recommended if the FLS sensor is used. The FLS is detecting liquid in the stator housing, which is critical and requires a quick stop of the pump.
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