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Timing Relays (RTW/ERWT)
9
Multifunction Models (ERWT-MF1)
Operating mode
A (ON-delay) – Timing begins when the supply voltage is applied. When the time delay (T) is
completed, the output relay is energized. If the supply voltage is interrupted, the output relay is
de-energized in case it is energized (after the time delay). If the relay supply voltage is
interrupted before the time is completed, the time delay is reset and the output relay won’t be
energized. This function requires the continuous application of supply voltage.
Timing diagram
Supply voltage
A1-A2
Output
15-18, 25-28
15-16, 25-26
LED U/T
LED R1
LED R2
T <T
Ba (OFF-delay with control signal) – Timing begins when the supply voltage is applied.
When the selected time delay (T) is completed the output relay is de-energized. If the
supply voltage is interrupted, the output relay is de-energized in case it is energized (after
the time delay). If the relay supply voltage is interrupted before the time is completed, the
time delay is reset and the output relay won’t be energized. This function requires the
continuous application of supply voltage.
Timing diagram
Supply voltage
A1-A2
Output
15-18, 25-28
15-16, 25-26
Control voltage
B1-A2
LED U/T
LED R1
LED R2
T
≥30ms
T<T
Ca (ON and OFF-delay with control signal) – Timing begins when the supply voltage is
applied. When the selected time delay (T) is completed, the output relay is energized and/
or de-energized, depending on the current situation. If the supply voltage is interrupted, the
output relay is de-energized in case it is energized (after the time delay). If the relay supply
voltage is interrupted before the time is completed, the time delay is reset and the output
relay won’t be energized. This function requires the continuous application of supply
voltage.
Timing diagram
Supply voltage
A1-A2
Output
15-18, 25-28
15-16, 25-26
Control voltage
B1-A2
LED U/T
LED R1
LED R2
T
≥30ms
<T TT T<T
Da (symmetric flasher, start ON) – Applying the supply voltage, timing begins with times
given by T1 (output ON) and T2 (output OFF). The cycle starts with the output relay
energized. The times of full scale range T1 and T2 are the same. The total cycle is given by
T = T1+T2. Interrupting the supply voltage with the output energized resets the time delay
and de-energizes the output relay. This function requires the continuous application of
supply voltage.
Timing diagram
Supply voltage
A1-A2
Output
15-18, 25-28
15-16, 25-26
LED U/T
LED R1
LED R2
T T T T T T T <T
Operating mode
Db (symmetric flasher, start OFF) – Applying the supply voltage, timing begins with times given
by T1 (output ON) and T2 (output OFF). The cycle starts with the output relay de-energized. The
times of full scale range T1 and T2 are the same. The total cycle is given by T = T1+T2.
Interrupting the supply voltage with the output energized resets the time delay and de-
energizes the output relay. This function requires the continuous application of supply voltage.
Timing diagram
Supply voltage
A1-A2
Output
15-18, 25-28
15-16, 25-26
LED U/T
LED R1
LED R2
T T T T T T T <T
E (Impulse ON) – The output relay is immediately energized when the supply voltage is
applied and de-energized when the selected time (T) is completed. If the supply voltage is
interrupted before the time delay is completed, the relay is de-energized and the time de-
lay is reset. This function requires the continuous application of supply voltage.
Timing diagram
Supply voltage
A1-A2
Output
15-18, 25-28
15-16, 25-26
LED U/T
LED R1
LED R2
T <T
Fa (Impulse ON with control signal) – The output relay is energized after the control supply
voltage is applied and de-energized when the time delay (T) is completed. If the supply
voltage is interrupted before the time delay is completed, the relay is de-energized and the
time delay is reset. This function requires the continuous application of supply voltage.
Timing diagram
Supply voltage
A1-A2
Output
15-18, 25-28
15-16, 25-26
Control voltage
B1-A2
LED U/T
LED R1
LED R2
T
≥30ms
T<T
G (star-delta) – Applying the supply voltage, the star output relay is energized, and the
selected time begins. When the time (T) is completed, the star output relay is de-
energized, and the fixed transition time (approximately 100 ms) begins. When the
transition time is completed, the delta output relay is energized and remains energized
while the relay is supplied. This function requires the continuous application of supply
voltage.
Timing diagram
Supply voltage
A1-A2
Output
25-28
25-26
LED U/T
LED R1
LED R2
T <T
Output
15-18
15-16
50ms
Functions