York YK-EP B Operation & Maintenance Manual page 125

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
VSD Start Frequency
Access Level Required: SERVICE
The VSD Start Frequency is as follows:
• 60 Hz units with quick start enabled equal 30 Hz
to 45 Hz (default 45 Hz)
• 50 Hz units equal 25 Hz to 37.5 Hz (default 37.5
Hz)
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
This is the same setpoint 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
Delta T needed to be met to enable surge mapping and
speed reduction initially on startup. (0.5°F to 4.0°F; de-
fault 1.0°F)
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Quick Ramp Current Threshold
Access Level Required: SERVICE
This setpoint sets the motor current threshold where
the VSD speed command ramp rate changes. At or be-
low 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 faster pulldown times. However, setting this
value too high can result in slower pulldown times due
to hitting the current limit sooner on pulldown. (20% to
80% FLA; default 50%)
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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