YOKOGAWA WT210, Руководство пользователя, Страница: 146 / 316

9-10
IM 760401-01E
Dual Mode
This mode allows you to combine the limit values of two relays (e.g. the upper value
(Hi) and the lower value (Lo)) to determine the contact status. The four relays will be
fixed as two pairs of ch1 & ch2 and ch3 & ch4. Setting the limit values of a pair of
relays (e.g. ch1 & ch2) can only be done at the same display function. The setting
method, relay operation, etc. are the same as in the single mode, and when the
measured, computed, and integrated values exceed the preset limits, the contact
status will become NO.
The following shows an example.
Below lower limit
⇒
open circuit
NC
NO
ch 1
COM
NC
NO
ch 2
COM
Exceeding lower
limit, below upper
⇒
closed circuit
NC
NO
ch 1
COM
NC
NO
ch 2
COM
Exceeding upper
limit
⇒
open circuit
NC
NO
ch 1
COM
NC
NO
ch 2
COM
24 V
24 V
24 V
When the current value exceeds 1 A, but is less then 3 A: GO will be ditermined
and the circuit becomes closed.
When the current value lies below 1 A, or exceeds 3 A: NO-GO will be determined
and the circuit becomes open.
Current
Time
Upper limit (Hi)
Lower limit (Lo)
3 A
1 A
Limit of ch2 is set to 1 A
Limit of ch1 is set to 3 A
Current
Time
Upper limit (Hi)
Lower limit (Lo)
3 A
1 A
Limit of ch2 is set to 1 A
Limit of ch1 is set to 3 A
Current
Time
Upper limit (Hi)
Lower limit (Lo)
3 A
1 A
Limit of ch2 is set to 1 A
Limit of ch1 is set to 3 A
GO determination area
NO-GO determination area
NO-GO determination area
Note
• In the dual mode, the combinations ch1&ch2, and ch3&ch4 are fixed. The following
combinations are not possible.
• Within a pair you can set either channel as upper or lower limit.
• The values of V (voltage), A (current), W (active power), VA (apparent power), var (reactive
power), Vpk (voltage peak), and Apk (current peak) while the MAX hold function (see section
4.8) is enabled will be displayed according to the maximum values (MAX) that are held. The
values that are compared against the limit values are also the maximum values (MAX) that
are held.
9.4 Comparator Function (Option)