York YK-EP, Operation And Maintenance Manual

Page: 77 / 268

Table 65: Display only
Field/LED name Description
Output Current – Phase A, B,
C
Displays the phase current measured to the motor.
Pre-Rotation Vanes Control
Mode
Indicates whether the vanes are under manual or automatic control.
[Pre-Rotation Vanes] Open
(LED)
Illuminates when an OPEN command is being sent to the vanes.
[Pre-Rotation Vanes] Close
(LED)
Illuminates when a CLOSE command is being sent to the vanes.
Table 66: Programmable
Button Access level Description
Set Service
Allows manual programming of the Command Frequency value.
Manually programming this value will put the drive frequency
control in Manual Speed Control mode and send the programmed
Command Frequency to the drive.
Auto Service
Puts the drive frequency control in automatic control. The Pre-
Rotation Vanes calibration must have been successfully performed
before this entry will be accepted.
Fixed Service
Puts the drive frequency control in fixed speed mode, commanding
it to run at maximum frequency (50 or 60 Hz).
Raise Service
Puts the drive frequency control into manual mode. Each time it is
pressed it increases the Command Frequency to the drive by the
amount defined by the MANUAL INCREMENT key. It will not raise
the value above the maximum allowed (50 or 60 Hz).
Lower Service
Puts the drive frequency control into manual mode. Each time it
is pressed it lowers the Command Frequency to the drive by the
amount defined by the MANUAL INCREMENT key. It will not lower
the value below the minimum allowed; (30Hz for 60Hz units; 25Hz
for 50Hz units).
Manual
Increment
Service
Defines the amount by which the manual Raise and Lower
commands will change the Command Frequency to the drive in
Manual Speed Control mode.
[Pre-Rotation
Vanes] Open Service
Puts the vane control into manual mode and sends an OPEN
command to the vanes.
[Pre-Rotation
Vanes] Close Service
Puts the vanes control into manual mode and sends a CLOSE
command to the vanes.
[Pre-Rotation
Vanes] Hold Service
Puts the vane control into manual control and sends a HOLD
command to the vanes.
[Pre-Rotation
Vanes] Auto Service
Puts the vane control into automatic mode.
77 YK-EP Style B Centrifugal Chiller