YOKOGAWA Yew 80 Series, User Manual, Page: 59 / 66

General
Specifications
Model SKYD (Style S)
Alarm Unit
GS 01B04K01-02E
GS 01B04K01-02E
©Copyright Jan. 1983(YK)
12th Edition Sep. 2019(YK)
n
GENERAL
The Model SKYD Alarm Unit accepts input signals,
and provides absolute or deviation alarm outputs.
Absolute alarms are output after comparison of input
signals from a single source with one or two setpoints,
and deviation alarms are output after comparison of
input signals from two sources with two setpoints.
Direct or reverse alarm action can be selected for
each of the alarm output settings. The front panel is
provided with an alarm LED for confirming alarm relay
operation (when relay is energized).
The JHT200 Handy Terminal* is used for setting Alarm
Unit parameters. On the SKYD model with display
setter (SKYD-

04), input indication (engineering unit)
and alarm settings can be set on the front panel.
*: The BT200 BRAIN Terminal of YOKOGAWA
Electric Corporation can also be connected.
The adapter for modular jack (E9786WH) is
required for connecting the JHT200 Handy
Terminal to the Alarm Unit.
n
STANDARD SPECIFICATIONS
Input Signals
Input: 1 to 5 V DC
Number of inputs: 1 (SKYD-1/2 type) or 2 (SKYD-3
type)
Load Resistance: 1 MΩ
Square root extraction (absolute alarm only)
Computation: E = 2 E – 1 + 1
0 1
When E
1
is less than low cut, E
0
= E
1
E
0
: Input Signal (after square root calculation),
E
1
: Input Signal (before square root calculation)
Output Signals
Output: Relay contact
Contact Capacity: 100 V AC, 1 A (resistive load)
220 V AC, 0.5 A (resistive load)
30 V DC, 1 A (resistive load)
110 V DC, 0.1 A (resistive load)
Contact Life Expectancy: 600,000 times
Number of Outputs:
1 (SKYD-1 type) or 2 (SKYD-2/3
type)
Alarm Functions
Alarm operation: 1 input absolute alarm (SKYD-1/2
type)
2 input deviation alarm (SKYD-3
type)
Alarm Setting
Input absolute alarm: 0 to 100%
Input deviation alarm: -100 to +100%
Hysteresis: 0 to 100%
Alarm ON/OFF delay: 0 to 999 sec.
<Following setting ranges only on SKYD-

04>
Input absolute alarm/deviation alarm:
-9999 to +9999 (engineering unit)
Hysteresis: 0 to 9999 (engineering unit)
Direction of alarm action: Direct/reverse
Excluding SKYD-

04
Selection by parameter setting
SKYD-

04 Selection by jumper switch setting
Direction of alarm relay action (at normal operation):
De-energized/energized
Direction of alarm relay action: De-energized setting at normal operation
Action
Input value or
deviation value
Setting
value
Setting
value
Input value or
deviation value
Direct Relay de-energized Relay energized
Reverse Relay energized Relay de-energized
Direction of alarm relay action: Energized setting at normal operation
Action
Input value or
deviation value
Setting
value
Setting
value
Input value or
deviation value
Direct Relay energized Relay de-energized
Reverse Relay de-energized Relay energized
Alarm Output: 1 transfer contact for each setting
NO: (Normally Open) means open when relay is
not energized.
NC: (Normally Closed) means closed when relay
is not energized.
BRAIN Communication Function:
Alarm action is set and this function is specified
by the JHT200 Handy Terminal*.