YOKOGAWA WT110 User Manual

IM 253401-01E
10-8
10.4 Comparator Function (optional)
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/integrated/analysis 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
24V
24V
24V
When the current value exceeds 1A, but is less then 3A: GO will be ditermined
and the circuit becomes closed.
When the current value lies below 1A, or exceeds3A:NO-GO will be determined
and the circuit becomes open.
Current
Time
Upper limit(Hi)
Lower limit(Lo)
3A
1A
Limit of ch2 is set to 1A
Limit of ch1 is set to 3A
Current
Time
Upper limit(Hi)
Lower limit(Lo)
3A
1A
Limit of ch2 is set to 1A
Limit of ch1 is set to 3A
Current
Time
Upper limit(Hi)
Lower limit(Lo)
3A
1A
Limit of ch2 is set to 1A
Limit of ch1 is set to 3A
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 combinations ch1&ch3 and
ch2&ch4 are not possible.
• Within a pair you can set either channel as upper or lower limit.
CAUTION
Make sure not to greatly vary the input signal when using the comparator
function. Depending on the input signal used for determination, the
instrument may display error codes (i.e. overrange) and this will change the
output relays as follows. When using the output relay as a control signal,
make sure to match these control signals with other equipments to
eliminate erroneuous control.
Displayed error Relay status
oL (over range) The NC contact is closed.
oF (over flow) The NC contact is closed.
dEGEr (phase angle error) The NC contact is closed.
PFErr (power factor error) The NC contact is closed.
ErrLo (frequency error) The NC contact is closed.
ErrHi (frequency error) The NO contact is closed for this
case only.
FrqErr (frequency error in case of harmonic analysis) The NC contact is closed.
—— (error when no data are present) The NC contact is closed.

YOKOGAWA WT110 Specifications

General

Brand	YOKOGAWA
Model	WT110
Category	Measuring Instruments
Language	English