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70R-1000D
User Manual
36 pgs1.77 Mb1

GE 70R-1000D User Manual

70R-1000D
11/04
ZTG/ZTGD Series Transfer Switches
40-3000 Amps
GE Zenith Controls
Operation and Maintenance Manual
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Engine Start Control Connections . . . . . . . .14-6
Initial Energization . . . . . . . . . . . . . . . . . . . .16-7
MX150 Microprocessor Controller . . . . . . . . . . . . .18
User Setting for Voltage & Frequency . . . . . .110
Standard Features, MSTDG Option Pkg. . .10-11
Standard Features, MEXEG Option Pkg. . . . .12
Optional Accessories . . . . . . . . . . . . . . . . . . . . .13
How to Set the System Clock . . . . . . . . . . . . . .14
CDT One Event Timer Exerciser . . . . . . . .14-15
CDP Clock Exerciser . . . . . . . . . . . . . . . . . . . . .16
User Setup - SET Menu . . . . . . . . . . . . . . . . . .18
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120
Standard Transition . . . . . . . . . . . . . . . . . . . . .120
Delayed Transition . . . . . . . . . . . . . . . . . . . . . .20
Page
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . .21
Standard Transition . . . . . . . . . . . . . . . . . . . . .121
Delayed Transition . . . . . . . . . . . . . . . . . . . . . .21
Controls Power Supply (CPS) . . . . . . . . . . . . . . . . .22
Schematics, Standard & Delay . . . . . . . . . . . .123
Troubleshooting & Diagnostics . . . . . . . . . . . . . . . .24
Maintenance and Testing . . . . . . . . . . . . . . . . . . . . .25
Inspection and Cleaning . . . . . . . . . . . . . . . . .25
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
Power Panel & Replacement Parts . . . . . . . . . . . . .26
Standard Transition . . . . . . . . . . . . . . . . . . . . . .26
40-260 Amps . . . . . . . . . . . . . . . . . . . . . . . . . . .26
400-600 Amps . . . . . . . . . . . . . . . . . . . . . . . . . .27
800-1200 Amps . . . . . . . . . . . . . . . . . . . . . . . . .28
1600-3000 Amps . . . . . . . . . . . . . . . . . . . . . . . .29
Delayed Transition . . . . . . . . . . . . . . . . . . . . . .30
40-600 Amps . . . . . . . . . . . . . . . . . . . . . . . . . . .30
800-1200 Amps . . . . . . . . . . . . . . . . . . . . . . . . .31
1600-3000 Amps . . . . . . . . . . . . . . . . . . . . . . . .32
Table of Contents
Introduction
GE Zenith Transfer Switches are used to provide a continuous source of power for lighting and other critical loads by auto­matically transferring from source 1 power to source 2 power in the event that source 1 voltage falls below preset limits.
Voltage sensing and system control is performed via a state-of-the-art microcontroller located on the cabinet door. It is designed to give highly accurate control of the transfer switch system.
All GE Zenith transfer switches are designed for use on emergency or standby systems, and are rated for total system or motor loads. Transfer switches are UL Listed under Standard 1008 and CSA Certified under Standard C22.2 No. 178 and IEC Listed under Standard 947.
NOTES: A protective device such as a molded case circuit breaker or fused
disconnect switch MUST
be installed on both sources of incoming
power for circuit protection and as a disconnection device. All references made within this manual about the term “S1” or
“Source 1” relate to a Normal Power Source. All references made about the term “S2” or “Source 2” relate to an Emergency or Alternative Power Source.
Authorized Service
For GE Zenith parts and service, call: (773) 299-6600
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ZTG/ZTGD Operation and Maintenance Manual (70R-1000D)
Each GE Zenith transfer switch is factory wired and tested. A complete information package is furnished with each switch which includes:
a. Sequence of operation. b. Description and operation of
all accessories supplied.
c. Power panel connection diagram
and schematic.
d. Description and identification of
all customer field connections.
Installation of GE Zenith transfer switches includes:
a. Mounting the transfer switch cabinet. b. Connection of Source 1, Source 2,
and Load cables or bus bars.
c. Connection of external control
circuits as required.
Mounting
Adequate lifting means must be used to mount the transfer switch into place. The recommended method for moving the transfer switch using the lifting eyes, where supplied, and a spreader bar is illustrated in Figure 1. Enough room should be allowed to open the cabinet doors fully for inspection and servicing of the switch per NEC and local codes.
Safety / Installation
DANGER
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
The safe operation of your switch is GE
Zenith’s focus. The proper storage, installation, operation and mainte­nance will help increase the life of the switch.
Equipment Inspection and Storage
Once you have received the transfer switch, inspect it for any damage. This includes damage to the enclosure, power panel, control panel and wiring harness. If any damage is found or suspected, file a claim as soon as possible with the carrier and notify the nearest
GE
Zenith representative.
Before installation, if it is necessary, store the transfer switch in a clean dry place, protected from dirt and water. Provide ample air circulation and heat, if neces­sary, to prevent condensation.
5% to 95% (non-con­densing)
-30°C to +75°C (-22°F to +167°F)
40-400
AMP
(molded shell)
-20°C to +65°C (-4°F to +149°F)
40-4000
AMP
(all other frame and panel types)
-20°C to +60°C (-4°F to +140°F)
Operating Storage Temperature Temperature (Ambient): Humidity
CAUTION
Due to hazardous voltage and current, GE Zenith rec-
ommends that a
GE Zenith Certified technician or a
qualified electrician must perform the
installation and maintenance of the switch.
Final Equipment Inspection
Prior to energizing the transfer switch:
1. Remove any debris incurred, with a vacuum, due to shipment or installation.
WARNING
Do not use a blower since debris may
become lodged in the electrical and
mechanical components and cause damage.
2. Verify that all cabled connections are correct and that phase rotation of both sources match.
3. Check engine start connections.
4. Verify the correct connection of all control wires.
5. Check settings of all timers and adjust as necessary.
6. Adjust any optional accessories as required.
7. Check the lug torque values of the power connections.
NOTE
: Lug torque values are specified
in table 2 on pg.4.
8. Make sure that all covers and barriers are installed and properly fastened.
NOTE
: Power panels ship from GE Zenith
in Source 1 Position.
CAUTION
Before drilling conduit entry holes or any
accessory mounting holes, cover and protect
the switch and control panel to prevent dirt
and metal fragments from entering the mechanical and electrical components.
Failure to do so may result in
damage and malfunction of the switch.
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ZTG/ZTGD Operation and Maintenance Manual (70R-1000D)
Table 2
Tightening Torque for Lugs
Socket Size
Across Flats
Torque
Lb. - In.
Lb. - Ft.
45
1/8
4
100
5/32
8
120
3/16
10
150
7/32
12
200
1/4
17
275
5/16
23
375
3/8
31
500
1/2
42
600
9/16
50
Installation (cont’d)
D
CABINET
LIFTING EYES
SPREADER BAR
H
45°
Figure 1
Power Connections
GE Zenith transfer switches are supplied with UL listed solderless screw type terminals as standard for the Source 1, Source 2 and Load power connections. Table 1 lists the number and sizes of cable lugs supplied as standard for each switch amp rating.
Connect the Source 1, Source 2, and Load conductors to the clearly marked terminals on the transfer switch. Remove surface oxides from cables by cleaning with a wire brush. Verify that all connections are correct before tightening the lugs. All cable lug connections must be tightened to the proper torque values as shown in Table 2.
NOTE
: Do not run cables or wiring behind
front-connected transfer switches.
DANGER
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
Table 1
Power Connections: Screw Type Terminals for External Power Connections
Switch Size
(Amps)
40
80 100 150
200, 225
400 600
800, 1000, 1200
Source 1, Source 2 & Load Terminals
1 #8 to 3/0 AWG
Cable Per Pole Range of Wire Sizes
1 #8 to 3/0 AWG 1 #8 to 3/0 AWG 1 #8 to 3/0 AWG 1 #6 AWG to 250 MCM
1 #4 AWG to 600 MCM 2 #2 AWG to 600 MCM 4 #2 AWG to 600 MCM
Neutral Bar (When Required)
3 #14 to 1/0 AWG
No. of Cables Range of Wire Sizes
3 #14 to 1/0 AWG 3 #14 to 1/0 AWG 3 #6 AWG to 350 MCM 3 #6 AWG to 350 MCM
4 #4 AWG to 600 MCM
260
1 #6 AWG to 350 MCM 3 #6 AWG to 350 MCM
8 #4 AWG to 600 MCM
12 #4 AWG to 600 MCM
1600, 2000 2600, 3000
8 #2 AWG to 600 MCM
24
#4 AWG to 600 MCM
Engine Start Control Connections
Engine-start control wires connect to control terminals beside the MX150. Engine start terminals are indicated by a schematic symbol (the symbol indicates the contact state for a de-energized normal source). Figure 3 shows the engine-start contacts.
Make all other necessary control connections to the con­trol panel terminal blocks per the schematics supplied with the ATS.
NOTE: All control wires (18-12 AWG) must be
torqued to 19 in/lbs.
NOTE
: When lifting the switch using a spreader bar,
height H must be equal to half of distance D.
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ZTG/ZTGD Operation and Maintenance Manual (70R-1000D)
Installation (cont’d)
A complete information package is furnished with each transfer switch including a complete connection diagram and schematic which details all necessary control circuit field connections.
The engine start control wires connect to the engine start relay terminals located to the left of the microprocessor. Figure 2 shows the location of these terminals.
DANGER
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
To R/T Box
To Power
Panel
Input/Output
Connectors
to I/O Modules
Engine Start Connections
Clock Program Backup Battery
Remove protective strip to enable clock functions
Network Connector
Control Connections
The terminals are clearly identified by a label on the microcontroller backplate. In the case of manual trans­fer switches, or in other applications not requiring the microprocessor, clearly marked terminal blocks are provided in the upper left corner of the control panel for the engine start control wires.
Figure 2
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ZTG/ZTGD Operation and Maintenance Manual (70R-1000D)
Installation (cont’d)
Engine Start Control Connections
The engine-start terminals are clearly identified by a label on the microcontroller backplate. In the case of manual transfer switches, or in other applications not requiring the microprocessor, clearly marked terminal blocks are provided in the upper left corner of the con­trol panel for the engine start control wires.
Terminals for field connections to the A3 Source 2 auxiliary contacts and the A4 Source 1 auxiliary contacts are also provided. These terminals are clearly marked and appear on the side of the power panel. On 400 amp metal frame units these terminals appear on the bracket above the operator handle.
Initial Energization
Before proceeding, refer to the information package supplied with the ATS and read and understand the information on all accessories provided.
1. Unlock the enclosure.
2. Open the enclosure.
3. Verify the correct system voltage.
NOTE: The equipment rating nameplate on
the transfer switch lists the voltage. See Figure 4.
4. Close Source 1 circuit. breaker.
NOTE:The controller will illuminate Source 1
Available LED if proper voltage is sensed.
5. Verify the phase to phase voltages at the Normal line terminals.
6. Close the Source 2 circuit breaker.
7. Start the generator engine.
DANGER
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
NOTE: The controller will illuminate Source 2
Available LED when preset voltage and frequency levels are reached.
8. Verify the phase to phase voltages at Source 1 line terminals.
9. Verify that the phase rotation of Source 1 is the same as the phase rotation of Source 2.
10. Shut down the generator engine.
11. Place the starting control in the Automatic position.
12. Complete the visual inspection of the transfer switch.
13. Close the enclosure.
14. Lock the enclosure.
CAUTIONS
Certain accessories, per specific
schematics, can inhibit automatic transfer.
Engine Gen-Set could start when
engine control wires are attached.
Figure 4
SERIAL NUMBER:
RA
TING: VOLTS -
AMPS -
SYSTEM VOLTS:
MODEL NUMBER:
HZ -
PHASE -
GE Zenith Controls
E
Figure 3
4
5
6
1
2
(Engine Start)
3
P Relay
Contact rating is 10 Ampere at 120VAC or 28VDC Gold plated
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ZTG/ZTGD Operation and Maintenance Manual (70R-1000D)
Installation (cont’d)
5. Close the External (up-stream) Source 2 line
circuit breaker.
6. Start the engine generator in
MANUAL mode.
NOTE: When the voltage and frequency
reach preset values, the Source 2 Available
LED will illuminate.
7. Verify the phase to phase voltages at Source 2
line terminals.
8. Verify that the phase rotation of
Source 2 is the same as the phase rotation of Source 1.
9. Shut down the generator's engine.
(Place in Automatic Mode.)
NOTE: Source 2 Available LED
will turn off.
NOTE: The engine generator will continue
to run for the duration of Source 2 Stop Delay Timer.
10. Place the disconnect switch to ENABLE.
11. Complete the visual inspection of the
transfer switch.
12. Close the enclosure.
13. Lock the enclosure.
MX150
Figure 5 – LCD and keypad
Initial Energization (cont’d)
After all options and accessories are checked and veri­fied, follow these steps to set up the ATS. Refer to MX150 display Figure 5. The annunciation LEDs illuminate to indicate (1) source availability, (2) ATS position, and (3) MX150 control function (timing).
1. Unlock the enclosure.
2. Open the enclosure.
3. Place the Disconnect Switch in the Inhibit.
NOTE
: This step is only performed if the
“DS” Option was purchased.
4. Close the external (up-stream) Source 1 circuit breaker.
NOTES: Source 1 Available and Source 1
Position LED’s will illuminate.
If Source 1 Available
LED does not
illuminate, verify that Source 1 Voltage is above the preset restore value.
The Gen-Set will start and run while Source 2 stop Delay Timer is timing.
WARNING
When performing a hi-pot or
dielectric test on the power section,
DISCONNECT the control panel plugs from
the microprocessor to avoid potential damage.
S1 OK
21:56
MON 23 APR 2002
MORE TEST
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ZTG/ZTGD Operation and Maintenance Manual (70R-1000D)
MX150 Microprocessor Controller
MX150 Controller
Consists of two major assemblies:
I. The Microprocessor contains the following:
A. MX150 Board - Customer Input and Output
(I/O) for system interface. Located on the left hand side of the back of the unit (see figure 6)
1. I/O accessories that can be found here are: a. Engine start relay P output b. Pre-Signal to transfer T3, W3 and
UMD output (optional)
c. Transfer Inhibit Q3 and Q7 input
(optional) d. Remote test Q2 input (optional) e. Network interface ZNET
input/output (optional)
B. LCD and Keypad located on the exterior
of the door (see figure 7)
1. User accessibility to the following: a. LED indication of source
availability
b. LED indication of transfer
switch position
c. LCD screen indicates:
(1) timer count down (numeric) (2) event reporting (text)
d. Keypad provides user interface to:
[in conjunction with LCD screen]
(1) Setting sensors and timers (2) Configuring logic accessories
II. The Controls Power Supply (CPS)
Contains transformers which drop line voltage to control level for controller input and SCR inputs (see figure 6).
Figure 7
Figure 6
I/O Interface
CPS
Engine Start Relay P
Battery Strip
and
Access
Code Label
MX150
Board
MX150
S1 OK
21:56
MON 23 APR 2002
MORE TEST
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ZTG/ZTGD Operation and Maintenance Manual (70R-1000D)
MX150 Microprocessor Controller (cont’d)
Figure 8
LCD & Keypad
These options are accessible through the LCD and keypad (see figure below). To become familiar with the options loaded into a particular unit, scrolling through the SET and CFG menu will show the descriptions of the options (see pages 17). These menus are the very same menus that are used to access the setting and/or configuration of these options. The SET (setting) menu is primarily used to show or change, time and voltage settings. The CFG menu is primarily used to turn an option on or off. When scrolling through these menus,
no changes can be made without entry of the access code. The factory set six-digit access code is located on a white label on the back of the unit (see figure 9 pgs. 17-19).
The MX150 has many logic options. Each controller is downloaded with options at the time of manufacture. The collection of options that any one controller has is specified at the time of order placement. The following pages include all the options that can reside in the controller. Not all units include all options.
Source 1 LED (Green) indicates Source 1 is acceptable for use
Source 1 Position LED (Green) indicates Power Panel (ATS) is closed to Source 1 position
Source 2 Position LED (Red) indicates Power Panel (ATS) is closed to Source 2 position
Source 2 (Red) indicates Source 2 is acceptable for use
LCD Screen
Current Time, Day and Date of Display
#1 or the word on the LCD above the key. The word above the key changes depending on which screen is being displayed.
S1 OK
01: 50
FRI 31 MAY 2003
MORE CFG TEST SET
MORE Menu
CFG Menu
TEST Menu
MX150
#2 or the word on the LCD above the key. The word above the key changes depending on which screen is being displayed.
Exercise Event "Impending"
* E *
SET Menu
Keypad
#4 or the word on the LCD above the key. The word above the key changes depending on which screen is being displayed.
#3 or the word on the LCD above the key. The word above the key changes depending on which screen is being displayed.
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ZTG/ZTGD Operation and Maintenance Manual (70R-1000D)
User Setting for Voltage & Frequency
Standard Features, MSTDG Option Pkg.
Source 1
Voltage "Restore"
Factory Default: 90% This adjustment determines the minimum acceptable voltage required to transfer to Source 1. Adjust via the SET menu. Range is 85% to 100% in 1% increments (see page 18). Once satisfied, the T timer will begin timing to transfer to Source 1.
Voltage "Fail"
Factory Default: 80% This adjustment determines the low voltage threshold. Adjust via the SET menu. Range is 75% to 98% in 1% increments (see page 18). "Fail" must be a minimum of 2 % below "Restore" setting. Once voltage falls below threshold, P timer begins timing to signal Source 2 Generator to start.
Source 2
Voltage "Restore"
Factory Default: 90% This adjustment determines the minimum acceptable voltage required to transfer to Source 2. Adjust via the SET menu. Range is 85% to 100% in 1% increments (see page 18). Once satisfied, the W timer will begin timing to transfer to Source 2.
Voltage "Fail"
Factory Default: 80% This adjustment determines the low voltage threshold. Adjust via the SET menu. Range is 75% to 98% in 1% increments (see page 18). "Fail" must be a minimum of 2 % below "Restore" setting. Once voltage falls below threshold, T timer will be bypassed to expedite the transfer to Source 1.
Frequency "Restore"
Factory Default: 95% This adjustment determines the minimum acceptable frequency required to transfer to Source 2. Adjust via the SET menu. Range is 90% to 100% in 1% increments (see page 18). Once satisfied, the W timer will begin timing to transfer to Source 2.
Frequency "Fail"
Factory Default: 90% This adjustment determines the low frequency threshold. Adjust via the SET menu. Range is 88% to 98% in 1% increments (see page 18). "Fail" must be a minimum of 2 % below "Restore" setting. Once satisfied, the W timer will begin timing to transfer to Source 2.
6
Test Switch, Momentary
A3
Auxiliary Contact: Closed when the switch is in Source 2 position.
A4
Auxiliary Contact: Closed when the switch is in Source 1 position.
Calibrate
While monitoring the actual Phase to Phase voltage lev­els and Frequency with a calibrated test equipment, the Phase to Phase voltage sensing and Frequency can be adjusted accordingly. Calibration capabilities are available for Frequency and AB, BC, CA Phase to Phase voltage for both Sources. Adjust via SET menu (see page 18)
CDT
Load or NO-Load. One event exerciser with adjustable Engine exercise timer. Exercise duration can be set between 5 and 60 minutes in 1 minute increments. Can be configured to run every 1, 7, 14, or 28 days. Factory Default is 20minutes. When exerciser is impending, (*E*) appears in the upper right hand corner of LCD screen. See page 14-15 for instructions. Configured via CFG (see page 17). Set via SET menu (see page 18).
DS
Disconnect Switch, Auto/Inhibit. Inhibits transfer in either direction when in inhibit. Allows automatic operation when in Auto. (800-4000 Amp units)
DT (Delayed Transition Only)
Time Delay from Neutral Switch position to Source 1 position. Adjustable 0-10 minutes in 1 second incre­ments. Standard setting is 5 seconds Adjust via SET menu (see page 18)
DW (Delayed Transition Only)
Time Delay from Neutral Switch position to Source 2 position. Adjustable 0-10 minutes in 1 second incre­ments. Standard setting is 5 seconds.Adjust via SET menu (see page 18)
E
Engine Start Contact
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ZTG/ZTGD Operation and Maintenance Manual (70R-1000D)
Std. Features, MSTDG Option Pkg. (cont’d)
EL/P
Event Log: Sequentially Numbered Log
of 16 events that track date, time, reason and action taken
System Data: Total Life Transfers (N2P)
Days Powered Up Total Transfers to S2 Total S1 Failures Time S1 available in Hrs Time S2 available in Hrs. (N1P)
K/P
Frequency Indication for S1 and S2
L
LNP Center-off position LCD-Indicator Indicating LED lights:
L1 Indicates Switch in Source 2 position. L2 Indicates Switch in Source 1 position. L3 Indicates Source 1 available. L4 Indicates Source 2 available.
P1
Time Delay Source 2 Start. Adjustable 0-10 seconds. Standard setting is 3 seconds. Adjust via SET menu (see page 18)
Q2
Peak Shave / Remote Load Test: Input for Peak Shave or Remote Load Test. Includes automatic return to Source 1 if Source 2 fails and Source 1 present.
R2E
Under voltage sensing of Source 2 for single-phase. (R17 replaces R2E for Utility to Utility switches)
R50
In Phase Monitor this feature restricts Live to Live Source Transfers to occur unless both Sources are within
7 electrical degrees or less of each other. (live Source to live Source transfers usually occur during transfer back to Source 1 or during Testing). R50 does not change the operation of the Automatic Transfer Switch in a power failure mode. After all timer functions have elapsed, the CHECKING FOR SOURCE SYNCHRO- NISM will be displayed as well as the direction of transfer (S1-S2 for example denotes transfer from Source 1 to Source2). When synchronism is accomplished, transfer will take place.
Notes: - If S2 Frequency is less than S1 Frequency,
display will show a series of (- - - - -…..) symbols.
- If S2 Frequency is greater than S1 Frequency, display will show a series of (+++++…..) symbols.
- Each (-) or (+) symbol represents 10 electrical degrees out of phase. A maximum of 18 symbols (180 electrical degrees) can be monitored.
- The number of (-) or (+) symbols decrease as the two sources approach synchronism and increase as the two sources drift out of synchronism.
- If S1 and S2 Frequencies are identical, the display will show a series of alternating
- - - -
symbols (++++…) which also indicate the approximate out of phase degrees
In the event that the Sources do not come within 7 electrical degrees of each other within 60 seconds, the unit will display the message: SYNCH CHECKING and will allow the user to BYPASS. If the BYPASS button is pressed, the unit will display the message: WARNING MAY CAUSE DAMAGE TO THE LOAD. Pressing XFR will actually bypass the R50. Since R50 is a passive device, the length of time it takes to reach Synchronism is de­pendent on the frequency difference between the two Sources. Source 1 is usually a Utility and the frequency is not within the control of the consumer. Source 2 needs to be adjusted to create an adequate difference in order for the transfer to happen a timely fashion.
Note: For optimum performance, Source 2
Generator should be adjusted a Maximum of 2 Hertz above or below the Utility frequency, minimum of 0.1 Hertz. (58 to 59.9) or (60.1 to 62) Hertz. Adjustment of Generator to 60Hertz could cause lengthy transfer delay
.
R50 Feature can be turned ON or OFF via CFG Menu (see page 17). Factory Default if OFF.
S13
Transfer Commit. Configured via CFG menu. (see page 17) When this Feature is set to OFF: The transfer Switch is not committed to transfer unless the outage duration is longer than the timers that precede the transfer to Source 2 position. This assumes that the outage will be an isolated event. When this Feature is set to ON: The transfer Switch is committed to transfer to Source 2 position once the W timer has begun timing, even if Source 1 power returns before the transfer to Source 2. This is to ensure that the transfer takes place, because one outage may be followed by another.
T
Time Delay (S1) Source 1 Stable Timer. To delay trans­fer to Source 1 (immediate retransfer on Source 2 fail­ure). Adjustable 0-60 minutes in 1 second increments. Standard setting is 30 minutes. Adjust via SET menu (see page 18)
U
(S2) Source 2 Stop Delay Timer. Allows Engine to run unloaded after switch retransfer to Source 1. Adjustable 0-60 minutes in 1 second increments. Standard setting is 5 minutes. Adjust via SET menu (see page 18)
W
Time Delay (S2) Source 2 Stable Timer. To delay trans­fer to Source 2. Adjustable 0-5 minutes in 1 second increments. Standard setting is 1 second. Adjust via SET menu (see page 18)
YEN
Bypass Timers Key utilizing Keypad. When applicable, the system prompts the user to press a button to bypass (T) or (W) Timers should the user so desires.
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