JOHNSON CONTROLS
134
FORM 160.78-O2
ISSUE DATE: 5/22/2017
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
MESSAGE DESCRIPTION
VSD - LINE VOLTAGE PHASE
LOCK LOOP
The drive will automatically determine the input voltage frequency. The information
about the input voltage frequency is provided to the drive logic board by the line voltage
isolation board. If the driver logic board cannot determine that the input voltage frequen-
cy is 50 or 60 Hz then this shutdown will occur.
VSD - LINE VOLTAGE PHASE
ROTATION
The input of the drive is not sensitive to the phase rotation of the input voltage, but
internally to the drive the rotation must remain the same. The output of the line voltage
isolation board cannot shown CBA rotation when the input voltage to the drive is really
ABC rotation. There are 2 methods within the VSD logic board to determine the line volt-
age phase rotation. If these 2 methods do not report the same phase rotation then this
shutdown will occur.
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