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FORM 160.87-OM1
ISSUE DATE: 8/24/2018
Pre-Rotation Vanes Position
Displays the present Pre-Rotation Vane position as a
value between 0% (closed) and 100% (full open).
Delta P/P
Displays chiller head pressure calculated as (condenser
pressure - evaporator pressure/evaporator pressure).
This value is calculated by the Microboard.
Temperature Differential (LCHLT – Setpoint)
Displays the difference between the Leaving Chilled
Liquid Temperature and the Leaving Chilled Liquid
Temperature Setpoint.
Command Frequency
This is the speed command being sent to the Drive
Logic Board in either Auto or Manual Speed Control
mode.
Speed Decrease Inhibit – Surge Map Point (LED)
Illuminates when the Microboard ACC function is un-
able to reduce speed due to a mapped surge point. Oth-
erwise, it is extinguished.
Mapping Inhibited (LED)
Illuminates when the Microboard ACC function is not
permitted to map points or reduce speed due to un-
stable Leaving Chilled Liquid Temperature, manual
speed control, current limit in effect (chiller FLA only)
or during Soft Shutdown. Otherwise, it is extinguished.
ACC Surge Detected (LED)
Illuminates momentarily when a surge is detected by
the ACC function in the Microboard, while the drive is
running at less than maximum frequency.
Surge Avoidance Surge Detected (LED)
Illuminates momentarily when a surge is detected by
the Surge Protection feature. This feature only detects
surges that occur while the drive is running at maxi-
mum frequency.
ACC Surge Count
Increments when a surge is detected while the drive is
running at less than maximum frequency.
Surge Map Point Count
Displays the total number of data points contained in
the surge map.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
PROGRAMMABLE
VSD Start Frequency
Sets the starting frequency from which the ramp-up
will begin. Programmable over the following range:
• 60Hz units – 30 Hz to 60 Hz (default 45 Hz)
• 60Hz units with Quick Restart – 30 Hz to 45 Hz
(default 45 Hz)
• 50 Hz units – 25 Hz to 50 Hz (default 37.5 Hz)
• 50 Hz units with Quick Restart – 25 Hz to 37.5 Hz
(default 37.5 Hz)
ACC Mapping Enable
Sets the Delta T (Leaving Chilled Liquid Temperature
- Setpoint) needed to be met to enable surge mapping
and speed reduction initially on startup. Programmable
over the range of 0.5°F to 20.0°F (default 1.0°F).
Surge Margin Adjust
This value determines how close the frequency reduc-
tion will be allowed to get to the surge line. Program-
mable over the range of 0.0 (default) to 25.0 Hz. Ser-
vice Technicians should refer to Variable Speed Drive
– Service Instructions (Form 160.00-M4) prior to ad-
justing this setpoint.
Surge Sensitivity
Allows the Service Technician to adjust the sensitivity
of the ACC Surge Detection in the Microboard (surges
that occur while the drive is running at less than maxi-
mum frequency). Programmable over the range of 1.5
to 2.5 with default of 2.0. Smaller values increase the
sensitivity.
Auto Map Print (Enable/Disable)
When enabled, the ACC surge map values are printed to
a connected printer each time a surge point is mapped,
as shown in SECTION 4 - PRINTING of this manual.
Manual Surge Point
Allows the Service Technician to manually log the
present running operating conditions into the surge
map as a valid surge point. When this key is pressed,
a dialog box appears requesting a special password to
proceed.
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