York YK Style H Operation Manual page 129

FORM 160.76-O2
issue date: 6/15/2015
VSD Start Frequency
Access Level Required: SERVICE
The VSD Start Frequency is as follows:
• 60Hz units with quick start enabled equal 30Hz to
45Hz (default 45Hz)
• 50Hz units equal 25Hz to 37.5Hz (default 37.5Hz)
This setpoint is the same as shown on the ACC DE-
TAILS Screen. It can be programmed on either the
ACC Screen or the QUICK START Screen. It sets the
VSD Start Frequency from which the speed will ramp
from.
Mapping Enable
Access Level Required: SERVICE
(0.5°F to 4.0°F; default 1.0°F) This is the same setpoint
as shown on the ACC DETAILS Screen. It can be pro-
grammed on either the ACC Screen or the QUICK
START Screen. It sets the Delta T needed to be met to
enable surge mapping and speed reduction initially on
startup.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Quick Ramp Current Threshold
Access Level Required: SERVICE
(20% to 80% FLA; default 50%) This setpoint sets the
motor current threshold where the VSD speed com-
mand ramp rate changes. At or below this threshold
the speed command ramp is 4X of standard control.
Over this threshold, the ramp rate is 2X of standard
control until it hits the standard current limiting over
80% FLA. Higher current thresholds can result in fast-
er pulldown times. However, setting this value too high
can result in slower pulldown times due to hitting the
current limit sooner on pulldown.
NAVIGATION
Home
Access Level Required: SERVICE
Returns user to HOME Screen.
Setpoints
Access Level Required: SERVICE
Returns user to SETPOINTS Screen.
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