Delta MM300 Instrukcja Obsługi Strona 36

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CHAPTER 2: INSTALLATION ELECTRICAL INSTALLATION
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 2–17
2.2.3.4 RTD sensor connections (I0_G module)
The type IO_G module contains three PT100 RTDs and associated protection functionality.
The MM300 monitors up to six RTD inputs for stator, bearing, ambient, or other
temperature monitoring types. The type of each RTD is 100 ohm platinum (DIN 43760).
RTDs must be three-wire type.
The RTD circuitry compensates for lead resistance, provided that each of the three leads is
the same length. Lead resistance should not exceed 25 ohms per lead. Shielded cable
should be used to prevent noise pickup in industrial environments. RTD cables should be
kept close to grounded metal casings and away from areas of high electromagnetic or
radio interference. RTD leads should not be run adjacent to or in the same conduit as high
current carrying wires.
Figure 21: RTD wiring
2.2.4 Input/output modules
The following input and output modules are available for the MM300.
Table 5: MM300 input and output modules
Motor
starter
Motor
Three-wire shielded cable
RTD
terminals in
motor starter
RTD terminals
at motor
Maximum total lead resistance:
25 ohms (Platinum and Nickel RTDs)
Route cable in separate conduit from
current carrying conductors
RTD in motor
stator or
bearing
853737A2.CDR
~4
~3
~2
~1
Compensation
Return
Hot
RTD Module shield
Surge ground
RTD MODULE
RTD 1
MM300 IED
~13
Module Slots Description
IO_C C, E, F, G, H Two 10 A form-A relays and six 60 to 300 V AC digital inputs.
IO_D E, F, G, H Four 10 A form-C relays
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