OMM 1008-1
71
DECREMENT (
⇓
Key)
Decrease the value or select the previous item in a list.
During edit mode, the display shows a two-character wide menu pane on the right as shown below.
SET UNIT SPs (X) <D
(data) <C
(data) <+
(data) <-
Additional fields can be edited by pressing the ENTER key until the desired field is selected. When the last
field is selected, pressing the ENTER key switches the display out of “edit” mode and returns the arrow keys
to “scroll” mode.
Alarms
When an alarm occurs, the alarm type, date, and time are stored in the active alarm buffer corresponding to
that alarm (viewed on the Alarm Active screens) and also in the alarm log buffer (viewed on the Alarm Log
screens). The active alarm buffers hold a record of the last occurrence of each alarm and whether or not it has
been cleared. The alarm can be cleared by pressing the Edit key. A separate buffer is available for each alarm
(High Cond Pressure, Evaporator Freeze Protect, etc.) The alarm history buffer holds a chronological
account of the last 25 alarms of any type.
Display Languages
Languages currently available are:
•
English
Units of Measure
It is possible to select units of measure directly from the keypad. Systems available are:
•
°
F / psi: unit controller, compressor controller, touch screen
•
°
C / kPa: touch screen only
Security
Two four-digit passwords provide OPERATOR and MANAGER levels of access to changeable parameters.
Either password can be entered using the ENTER PASSWORD screen which can be accessed in one of three
ways:
1.
The SET UNIT SPs menu
2.
Scrolling to it (last screen in the SET UNIT SPs column)
3.
By simply pressing the UP ARROW, DOWN ARROW, or DEFAULT keys while on the desired field
on one of the SET screens. The password can then be entered by pressing the ENTER key, scrolling to the
correct value with the UP and DOWN arrow keys, and pressing ENTER again. The length of the password
shall not be indicated. Once the correct password has been entered (cases 1 and 2 above), the PASSWORD
screen shall show the active password level. For case 3 above, the previously selected screen shall reappear
(still in edit mode) with the cursor on the previously selected field. Once a password has been entered, it
shall remain valid for 15 minutes after the last key-press. It shall be possible to change the passwords
through multi-chiller communications. Parameters and screens that require the MANAGER password shall
not be displayed unless the MANAGER password is active.
