Vfd Wiring - Carrier 19DV Series Installation, Operation And Maintenance Instructions

Relay K2 provides feedback to machine control with no effect on the safety function.
The architecture is two-channel:
A first functional channel consisting of the pressure switches sensors, the safety relay and the contactor K101.
A second functional channel consisting of the pressure switch sensors, the safety relay and the LF2 drive, with its
Gate-Kill function.
The reset of the HPS sensors is automatic when the pressure has dropped to an acceptable level. However, the
safety relay is configured for a controlled manual reset: closing its safety contacts always requires an action on the
reset button (see below).
3.6.3.3 Restart after triggering a High pressure switch
If a single pressure switch (HPS) is opened, the safety relay detects an inconsistency between the two sensors
and is de-energized to allow a change of state.
In this case, the restart procedure is as follows:
• Switch off the safety relay.
• Wait 5 seconds
• Switch on the safety relay again
• Wait 5 seconds
• Press the reset button
The duration of pressing the reset button is controlled: it must be between 250ms and 3s.
3.6.3.4 Feedback state of pre-actionning relay contacts
The state of the power contactor is linked to the relay SI 440R by a mirror contact circuit. Relay safety contacts
can only go into the closed position when the state is closed.
This good feedback is checked at each relay initialization and at each activation of the safety loop, annually during
the functional test of the loop.
The proper operation of the Gate Kill function is self-controlled by the drive.
3.6.3.5 Detection of crossed short circuits
The safety relay also has the function of detecting any short-circuit that may occur between the inputs of the safety
pressure switches (HPS).
3.6.3.6 Safety relay LED state
The state of the relay can be visually verified with the status LEDs present on the component:
LED status Status
PWR/Fault Continuous green
Blinking red
Green + red blinking
Continuous red
IN ON
OFF

3.6.4 VFD wiring :

Incoming power is connected to the line side of the circuit breaker inside the VFD.
Connect Wiring to VFD — Connect control wiring to the VFD. All control wiring must use shielded cable. Also,
connect the communications cable. Refer to the job wiring diagrams for cable type and cable number. Make sure
the control circuit is grounded in accordance with applicable electrical codes and instructions on machine control
wiring label.
For Rockwell VFD, UPS can not be connected directly without VFD modification.
NOTE:
I General
1.0 Variable Frequency Drive (VFD) shall be designed and manufactured in accordance with Carrier engineering
requirement.
1.1 All field-supplied conductors and devices must be compliant, and be installed in compliance with all applicable
codes and job specifications.
1.2 The routing of field-installed conduit and conductors and the location of field-installed devices must not
interfere with equipment access or the reading, adjusting or servicing of any component.
Description
Normal operating
Non-resettable fault. Need Cycling of supply voltage
Example: only one pressure switch open.
Resettable fault.
Internal fault ; Need Cycling of supply voltage
HPS closed
HPS opened
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