Q7 Integrated Enclosure Theory Of Operation; Stage 1 Function; Stage 2 Function; Stage 3 Function - Toshiba Q7 Installation And Operation Manual

Q7 Integrated Enclosure Theory of Operation

Note: Reference figures
Initially all switches are open and the normal states of all relays are as indicated in

Stage 1 Function

Power is applied to stage one via the Control Power Transformer (CPT). The 120 VAC signal is
applied to LED 5 (Control Power) only and LED 5 illuminates.

Stage 2 Function

Closing the door switch (LS) applies 120 VAC to stage two.
Stage two has two operating modes: Test operation and Normal 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. The 1M
contactor energizes which closes the 1M contacts (see
ASD).
Opening the LS (door open) switch terminates all stage 2 activity.

Stage 3 Function

The closures of the OL contacts and the CIA/B contacts are required to provide 120 VAC to stage 3.
The three positions of SW2; Off, INV, and BYP, are described below.
Off — K2 and K3 remain in the normal state.
INV — Energizes K2 which turns off LED 1 (Test; if on), illuminates LED 2 (INV Mode), opens
K2 at stage 3, closes K2 at stage 4, and completes the ST terminal path via PCB 11. The resulting
closure of K2 at stage 4 energizes the 2M contactor (jumper or open-damper signal at DRA/B
required) which allows the ASD output to be applied to the motor (see 2M at
BYP — Energizes K3 which turns off LED 2 (INV Mode) (if on), illuminates LED 3 (Bypass
Mode), opens K2 at stage 4 (which opens 2M if closed), and closes K3 at stage 4. The resulting
closure of K3 at stage 4 energizes the 3M contactor (jumper or open-damper signal at DRA/B
required) which allows the utility power to be applied directly to the motor bypassing the ASD (see
3M at Figure 8 on pg.
Note: Ensure that the phase relationship of the L1, L2, and L3 connections to the motor for the
Bypass mode of operation and for the ASD-driven operation are consistent. The Reverse and
Forward functions will be reversed if not properly connected (see diagram in
18). Changing the utility power input at the ASD will not affect ASD drive direction.
Damper Response Feedback (DRA/B circuit) may be required to prevent a motor from attempting to
force air flow through a duct that has a closed damper. A discrete terminal may be programmed to
disable the system if the damper is not fully open. The damper status is conveyed to the ASD via limit
switches on the damper that close the DRA/B circuit. When the damper is fully open the limit switch
closes and provides 120 VAC to the coil of K4. The K4 closure connects the programmed discrete
terminal (S3 assigned to Damper Feedback) to CC enabling normal system operation (JP1 jumper at
PCB12 required for this function).
Damper motor power may be provided via the DSA/B circuit. 120 VAC is provided externally and is
switched via the K3 contacts if operating in the Bypass mode or the OUT1 (DSA/B) contacts if the
motor is ASD-driven. Reversible limit switches at the damper location terminates power once the
damper is fully open or fully closed (reversible means that only the opposite function is available once
reaching the fully open or fully closed position). Only a fully opened damper provides a connection to
CC of the Damper Feedback terminal.
16
7 and 8 for the following explanation.
18).
Figure 8 on pg. 18; 3-phase input is applied to the
Figure 8 on pg.
Q7 ASD Installation and Operation Manual
Figure 7 on pg. 17.
Figure 8 on pg. 18).