Overload Relays and Thermal Unit Selection – Catalog

Overload Relay Selection
Thermal Unit Selection
- Introduction
  - Procedure for Thermal Unit Selection
  - Selecting Slow Trip Thermal Units
- Selecting Thermal Units
- Trip Current Rating Calculation
  - Procedure for Calculating the Trip Current Rating
- Calculating the Trip Current for Ambient Temperatures Other than 40 °C
- Thermal Unit Selection on an Approximate Basis—Based on Horsepower and Voltage
- Mounting the Thermal Units
- Thermal Unit Selection Tables
  - Table 1
  - Table 2
  - Table 3
  - Table 4
  - Table 5
  - Table 9
  - Table 10
  - Table 12
  - Table 13
  - Table 14
  - Table 15
  - Table 16
  - Table 17
  - Table 18
  - Table 19
  - Table 20
  - Table 21
  - Table 22
  - Table 24
  - Table 26
  - Table 28
  - Table 31
  - Table 34
  - Table 40
  - Table 41
  - Table 43
  - Table 44
  - Table 49
  - Table 53
  - Table 54
  - Table 56
  - Table 58
  - Table 59
  - Table 61
  - Table 65
  - Table 66
  - Table 67
  - Table 68
  - Table 69
  - Table 72
  - Table 73
  - Table 74
  - Table 75
  - Table 76
  - Table 77
  - Table 78
  - Table 79
  - Table 80
  - Table 81
  - Table 82
  - Table 83
  - Table 84
  - Table 85
  - Table 86
  - Table 87
  - Table 88
  - Table 89
  - Table 90
  - Table 91
  - Table 92
  - Table 93
  - Table 94
  - Table 95
  - Table 96
  - Table 103
  - Table 104
  - Table 105
  - Table 109
  - Table 110
  - Table 111
  - Table 112
  - Table 113
  - Table 114
  - Table 115
  - Table 116
  - Table 127
  - Table 128
  - Table 129
  - Table 133
  - Table 134
  - Table 135
  - Table 136
  - Table 145
  - Table 146
  - Table 147
  - Table 148

9065CT9701R03/21

LTMR Controllers

LTMR27EBD

The controller is the central component in the motor management system. It manages the basic functions such as:

Measurement of 3-phase current via integral current transformers from 0.4 to 100 A (up to 810 A by external current transformers)
Measurement of ground current internally or external ground sensors
Measurement of motor temperature
Inputs and outputs for the various motor control modes, detected fault management, and other functions

As standard, the controller manages the following:

Control modes

Overload mode
Independent mode
Reverser mode
Two-speed mode
Two-step mode
Custom mode

Inputs/Outputs

Six discrete logic inputs
Three relay logic outputs (1 N.O. contact each)
One relay output for detected fault signaling (1 N.O. + 1 N.C.) overload relay

Measurements

Connection for a thermistor probe
Connections for a ground sensor

LTMR Controllers

Setting Range (A)	Control Voltage	Current Range (A)	Catalog Number
Modbus™ Protocol
8	24 Vdc	0.4–8	LTMR08MBD
8	100–240 Vac	0.4–8	LTMR08MFM
27	24 Vdc	1.35–27	LTMR27MBD
27	100–240 Vac	1.35–27	LTMR27MFM
100	24 Vdc	5–100	LTMR100MBD
100	100–240 Vac	5–100	LTMR100MFM
Ethernet TCP/IP Communication (Protocols: Ethernet/IP and Modbus/TCP)
8	24 Vdc	0.4–8	LTMR08EBD
8	100–240 Vac	0.4–8	LTMR08EFM
27	24 Vdc	1.35–27	LTMR27EBD
27	100–240 Vac	1.35–27	LTMR27EFM
100	24 Vdc	5–100	LTMR100EBD
100	100–240 Vac	5–100	LTMR100EFM
CANopen Protocol
8	24 Vdc	0.4–8	LTMR08CBD
8	100–240 Vac	0.4–8	LTMR08CFM
27	24 Vdc	1.35–27	LTMR27CBD
27	100–240 Vac	1.35–27	LTMR27CFM
100	24 Vdc	5–100	LTMR100CBD
100	100–240 Vac	5–100	LTMR100CFM
DeviceNet™ Protocol
8	24 Vdc	0.4–8	LTMR08DBD
8	100–240 Vac	0.4–8	LTMR08DFM
27	24 Vdc	1.35–27	LTMR27DBD
27	100–240 Vac	1.35–27	LTMR27DFM
100	24 Vdc	5–100	LTMR100DBD
100	100–240 Vac	5–100	LTMR100DFM
Profibus DP Protocol
8	24 Vdc	0.4–8	LTMR08PBD
8	100–240 Vac	0.4–8	LTMR08PFM
27	24 Vdc	1.35–27	LTMR27PBD
27	100–240 Vac	1.35–27	LTMR27PFM
100	24 Vdc	5–100	LTMR100PBD
100	100–240 Vac	5–100	LTMR100PFM

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