Theory Of Operation; Stage 1 Function; Stage 2 Function; Stage 3 Function - Toshiba Q9 Plus Bypass ASD Installation & Operation Manual

Theory of Operation

The Q9 Plus Bypass ASD/Q9 Plus Bypass Box system is available in three primary
configurations. The system configuration type is defined by the suffix A, C, or E as shown in the
part numbering convention on
The description below targets the E configuration. System operation for the A and C types differ
from the E type where the referenced function is not supported by the A or C typeform.
Note: Reference
Note: The 200-volt 30 HP and 40 HP systems are designed with the ASD component and
the Bypass Box provided and mounted as separate items (e.i., the ASD is sold
separately; see
HP systems.

The Integrated Enclosure and the BYP Series systems operate in the same manner
— as described below.
Initially, all switches are open and the normal states of all relays are as indicated in

Stage 1 Function

Power is applied in Stage 1 via the Control Power Transformer (CPT). The 120 VAC signal is applied
to the Shunt Trip circuit and LED 5 (Control Power). LED 5 illuminates, and if the LS switch is open
(enclosure door is closed), the system is enabled for normal operation.
If the LS switch is closed (enclosure door is open), the Motor Circuit Protector (MCP) is opened via
the Shunt Trip function (see
system is terminated. The LS switch may be connected to an ancillary circuit that can perform a system
shutdown in the event of a system malfunction or an ancillary circuit status change (e.g., door opens,
over temp, etc.). The LS switch is used as a door interlock in this example.

Stage 2 Function

Stage 2 has two operating modes: Test operation and INV operation (K2 energized).
If the Test switch (SW1) is closed or if K2 is energized via SW2 (SW2 to INV, OL closed [open =
overload], and CIA-to-B closure required), the K1 relay is energized and the states of the K1 contacts
change.
LED1 illuminates (if in the Test mode) and the 1M contactor energizes, which closes the 1M contacts
(three-phase power is applied to the ASD input; see

Stage 3 Function

The closures of the OL contacts of the motor overload relay and the CIA/B (Customer Interface)
contacts are required to provide 120 VAC to Stage 3.
The CIA/B contacts are configured by the user such that the system is disabled in the event that any
user-selected function should undergo a state change (i.e., alarm is initiated, door is opened, etc.). 
CIA/B contacts may be jumpered if unused.
Q9 Plus Bypass ASD/Bypass Box Installation and Operation Manual
pg. 37.
Figure 1 on pg. 15 and Figure 7 on pg. 31
Table 4 on page 41). The same is true for the 400-volt 50 – 125

Motor Protection on pg.
for the following explanation.
17), and the three-phase input voltage to the
Figure 7 on pg. 31).
Figure 1 on pg. 15.
13