Electrical Wiring

The iMR350 has two terminal blocks. One serves to connect the HV power supplies, the other supports the LV, and MV options. This section documents how to safely connect a power source to the iMR350.

Electrocution hazard—risk of death, serious personal injury and/or damage to the device.


Electrical hazard—risk of damage to equipment. Do not connect AC power cables to a 24 or 48 power supply terminal block. Damage to the power supply may occur.

Caution access to wiring terminals and replaceable modules is restricted to skilled persons only.


Multiple power source—redundant power. Disconnect all power sources.


Different power sources shall be used to achieve the redundancy of power supplies.

Power Inputs and Fault Relay

The relay contact of the terminal block connector is used to detect user-configured events. The switch provides fail open and fail close contacts to form relay circuits based on requirements. If the device is not powered, or if an active alarm is present, the relay de-energizes, therefore initiating the NO and NC states. The contacts are energized upon power up of the unit and remain energized unless a critical error occurs. One common application for this output is to raise an alarm if a power failure or removal of control power occurs.

Connecting AC Power for Lug Terminal Blocks

All equipment must be installed according to applicable local wiring codes and standards.

Always use cables that are rated for the operating ambient temperature of 85°C.

For 100-240 VAC rated equipment, protection for earth fault is provided by max. 20 A branch circuit from AC input in building installation. The protection in the building installation is relied upon for short-circuit backup protection.

  • The specification for AC breaker is 5 A, 2P, 277 VAC (min) Circuit breaker, Thermomagnetic, or equivalent type.
  • The plug connector and wire gauge sizing is to be selected with appropriate design as per the Electrical code for a 60W, 1-phase device.
Note for IT power distribution systems:
  1. This product is also designed for IT power distribution system with phase-to-phase voltage 230 V.
  2. This equipment must be connected to an earthed mains socket-outlet.
Figure 1. AC Wiring Diagram

L—stands for Live; N—stands for Neutral

NO—Normally Open (open=open circuit=not creating a path for the current)

NC—Normally Closed (open=short circuit=creating a path for the current)

PE—Protective Earth (earth Ground point in the electrical circuit

To establish AC power connection with the power source turned off, follow the steps below. When following the instructions, refer to Figure 1.

  1. Remove the transparent plastic finger safe cover from the face of the terminal block.

If an AC power supply has been installed in PS1, perform steps 2 through 4 on the left hand terminal block. Please note that if there are no DC power supplies installed on the iMR350 then the right hand terminal block will not be populated.

  1. Connect the ground from the first power source to GND1 terminal screw (pin 4).
  2. Connect the Live from the first power source to the PWR1 +/L terminal screw (pin 1).
  3. Connect the Neutral from the first power source to the PWR1 -/N terminal screw (pin 2).

If an AC power supply has been installed in PS2, perform steps 5 through 7.

  1. Connect the ground from the second power source to GND2 terminal screw (pin 8).
  2. Connect the Live from the first power source to the PWR2 +/L terminal screw (pin 5).
  3. Connect the Neutral from the first power source to the PWR2 -/N terminal screw (pin 6).

To keep the wires from pulling loose, use a small flat-blade screwdriver to tighten the wire-clamp screws on the front of the terminal block connector.

  1. After wiring is completed, reinsert the transparent plastic finger safe cover back onto the face of the terminal block.
  2. Connect pin 3 to the ground of the chassis, with a braided cable, if Power Supply 1 is in use.
  3. Connect pin 7 to the ground of the chassis, with a braided cable, if Power Supply 2 is in use.

Connecting AC Power for Wire Terminal Blocks

All equipment must be installed according to applicable local wiring codes and standards.

Always use cables that are rated for the operating ambient temperature of 85°C.

For 100-240 VAC rated equipment, protection for earth fault is provided by max. 20 A branch circuit from AC input in building installation. The protection in the building installation is relied upon for short-circuit backup protection.

  • The specification for AC breaker is 5 A, 2P, 277 VAC (min) Circuit breaker, Thermomagnetic or equivalent type.
  • The plug connector and wire gauge sizing is to be selected with appropriate design as per the Electrical code for a 60W, 1-phase device.
Note for IT power distribution systems:
  1. This product is also designed for IT power distribution system with phase-to-phase voltage 230 V.
  2. This equipment must be connected to an earthed mains socket-outlet.
Figure 2. AC Wiring Diagram

L—stands for Live; N—stands for Neutral

NO—Normally Open (open=open circuit=not creating a path for the current)

NC—Normally Closed (open=short circuit=creating a path for the current)

PE—Protective Earth (earth Ground point in the electrical circuit

To establish AC power connection with the power source turned off, follow the steps below. When following the instructions, refer to Figure 1.

  1. Remove the transparent plastic finger safe cover from the face of the terminal block.

If an AC power supply has been installed in PS1, perform steps 2 through 4 on the left hand terminal block. Please note that if there are no DC power supplies installed on the iMR350 then the right hand terminal block will not be populated.

  1. Connect the ground from the first power source to GND1 terminal screw (pin 4).
  2. Connect the Live from the first power source to the PWR1 +/L terminal screw (pin 1).
  3. Connect the Neutral from the first power source to the PWR1 -/N terminal screw (pin 2).

If an AC power supply has been installed in PS2, perform steps 5 through 7.

  1. Connect the ground from the second power source to GND2 terminal screw (pin 8).
  2. Connect the Live from the first power source to the PWR2 +/L terminal screw (pin 5).
  3. Connect the Neutral from the first power source to the PWR2 -/N terminal screw (pin 6).

To keep the wires from pulling loose, use a small flat-blade screwdriver to tighten the wire-clamp screws on the front of the terminal block connector.

  1. Connect pin 3 to the ground of the chassis, with a braided cable, if Power Supply 1 is in use.
  2. Connect pin 7 to the ground of the chassis, with a braided cable, if Power Supply 2 is in use.

Connecting DC Power for Lug Terminal Blocks

This section explains how to connect the RAPTOR to a DC power supply.
Figure 3. DC Wiring Diagram

For 100-240 VDC rated equipment, an appropriately rated DC circuit breaker must be installed.
  • The specification for HV DC breaker is 5 A, 2P, 300 VDC (min) Circuit breaker, Thermo magnetic or equivalent type. A recommended option for this circuit breaker is: Model No. CX2-B0-14-450-22A-13G, Molded Case Circuit Breaker, 2 P, 5 A, 250/500 VDC.
  • Wire gauge sizing is to be selected with appropriate design as per the Electrical code for a 60 W, 1-phase device.

Equipment must be installed according to applicable local wiring codes and standards.

With the power source turned off, refer to figure Figure 3 and perform the following steps:

For a DC Power Supply in PS1, carry out steps 1 through 2, by wiring the right hand terminal block. Please note that if there are no AC power supplies installed on the iMR350 then the left hand terminal block will not be populated.

  1. Connect the positive wire from the power source to the positive (+), screw #1, terminal on the terminal block.
  2. Connect the negative wire from the power source to the negative (-), screw #2, terminal on the terminal block.

If a DC Power Supply has been installed in PS2, perform the following steps.

  1. Connect the positive wire from the power source to the positive (+), screw #5, terminal on the terminal block.
  2. Connect the negative wire from the power source to the negative (-), screw #6, terminal on the terminal block.

After wiring is completed, perform the following:

  1. For screw terminal blocks, install the transparent plastic finger safety cover.
  2. Connect pin 8 to the ground of the chassis with a braided cable. The ground terminal is used as the ground conductor for surge and transient suppression circuitry internal to the unit.

Connecting DC Power for Wire Terminal Blocks

This section explains how to connect the RAPTOR to a DC power supply.
Figure 4. DC Wiring Diagram


For 100-240 VDC rated equipment, an appropriately rated DC circuit breaker must be installed.
  • The specification for HV DC breaker is 5 A, 2P, 300 VDC (min) Circuit breaker, Thermo magnetic or equivalent type. A recommended option for this circuit breaker is: Model No. CX2-B0-14-450-22A-13G, Molded Case Circuit Breaker, 2 P, 5 A, 250/500 VDC.
  • Wire gauge sizing is to be selected with appropriate design as per the Electrical code for a 60 W, 1-phase device.

Equipment must be installed according to applicable local wiring codes and standards.

With the power source turned off, refer to figure Figure 3 and perform the following steps:

For a DC Power Supply in PS1, carry out steps 1 through 2, by wiring the right hand terminal block. Please note that if there are no AC power supplies installed on the iMR350 then the left hand terminal block will not be populated.

  1. Connect the positive wire from the power source to the positive (+), screw #1, terminal on the terminal block.
  2. Connect the negative wire from the power source to the negative (-), screw #2, terminal on the terminal block.

If a DC Power Supply has been installed in PS2, perform the following steps.

  1. Connect the positive wire from the power source to the positive (+), screw #5, terminal on the terminal block.
  2. Connect the negative wire from the power source to the negative (-), screw #6, terminal on the terminal block.

After wiring is completed, perform the following:

  1. Connect pin 8 to the ground of the chassis with a braided cable. The ground terminal is used as the ground conductor for surge and transient suppression circuitry internal to the unit.

Connecting Ground Wire for Safety Precautions

This section explains how to connect the ground wire to the RAPTOR.
Figure 5. Connecting Ground Wire

The earth ground connection must be verified by an electrical engineer or a service person skilled in electrical installation and grounding.

If the device is used as cord-connected mains equipment, for reliable earthing, use it as:

  • pluggable equipment type B, or
  • stationary pluggable equipment type A in a location with equiponential bonding or with a permanently connected protective earthing conductor
Attention:

The user shall be responsible for ensuring the integrity of any protective conductor connections before carrying out any other actions.

Attention: Wire gauge sizing is to be selected with the appropriate design as per the electrical code.
Attention: Equipment must be installed according to applicable local wiring codes and standards.
Attention: Protective earth connections should not be removed when the equipment is energized.
Attention: It is the responsibility of the user to ensure that the equipment is installed, operated and used for its intended function in the manner specified by the manufacturer. If this is not the case, then any safety protection provided by the equipment may be impaired.
Using a braided wire or another appropriate grounding wire, connect the chassis ground connection of the device.