Kohler KCC, Эксплуатация и установка

Страница: 28 / 60

TP-6833 2/16 28 Section 2 Installation
2.9.2 Extended Transfer Time Relay
(Model KCC only)
The extended transfer time relay is standard on
closed-transition transfer switches. The relay is
provided to prevent paralleling the standby and utility
sources for longer than the acceptable time, which is
typically 100 ms. The relay is located on the field
connection assembly. See Figure 2-26.
The relay starts timing when both sources are
connected. If one source fails to disconnect within the
set time, the relay energizes and a Fail to Open Source1
(or Source2) fault message will display on the ATS
controller. Identify and correct the cause of the source
disconnect problem before resetting the fault.
Connect the relay to a shunt trip on the emergency
source circuit breaker. Provide 12 or 24 VDC power as
required for the relay, as shown in Figure 2-27 or
Figure 2-30. Connect the DC power, emergency source
circuit breaker trip circuit (TR--EMER), and optional
alarm (TR-ALARM) to the field-connection terminal
block shown in Figure 2-26. See Figure 2-25 for typical
connections and refer to the schematic diagram
provided with the transfer switch.
The extended transfer time relay uses an adjustment
knob or switches to set the time delay. Compare your
equipment to Figure 2-26 and Figure 2-29 to identify the
relay used on your transfer switch.
GM89661
Figure 2-25 Typical Relay Connections (see the
schematic diagram for your transfer
switch)
Relay with Time Adjustment Knob
This section applies to the relay equipped with an
adjustment knob, shown in Figure 2-26. Relay
specifications are shown in Figure 2-27.
Setting the Time Delay (knob style)
A knob on the relay assembly allows adjustment of the
time delay. See Figure 2-26. The relay time delay is
adjustable between 100 ms and 10 seconds. The time
settings are in percent (%) of the maximum setting,
which is 10 seconds, and adjustable in 5% increments.
Figure 2-28 shows some sample settings. The typical
setting is 1% = 0.1 seconds (100 ms). If it is necessary
to set the relay to a longer time, ensure that the time
setting is in accordance with applicable codes.
1. Extended transfer time relay
2. Field connection terminal block
3. Time adjustment
1
TP-6833
2
3
Figure 2-26 Extended Transfer Time Relay
(knob style shown)
Relay Specifications
Input Power 24 VDC (customer-supplied)
Output Type Relay contacts, DPDT (2 form C)
Rating
10 amp max. resistive @ 240 VAC
100 mA @ 5 VDC min. load current
Figure 2-27 Relay Specifications (knob style)
Setting* Time
1 % 0.1 seconds (100 ms)
50 % 5 seconds
100 % 10 seconds
* Settings above 1% are adjustable in 5% increments.
Figure 2-28 Examples of Transfer Time Settings
(knob style)