Sentinel MCG 120M User manual

Sentinel Power Inc • 922 Middletown Rd, New Stanton, PA 15672 • E-Mail: [e-mail] • Tel.[phone] •Fax[phone]
MCGSurge Protection
120M and 160MInstallation Instructions
Lit Product No. 299-600-51 Rev. G
Page 1 of 4
Measure Phase to Neutral, Phase to Ground, and Phase to Phase with volt-
-
cation voltage prior to installation.
Power Service
120/240VAC
120/208VAC
220/380VAC
240/415VAC
240VAC
240/120/120VAC
277/480VAC
480VAC
120M/160M
-120T
-120Y
-220Y
-240Y
-240D
-240DCT
-277Y
-480D
Description
1ph, 3W + Gnd
3ph, 4W + Gnd, Wye
3ph, 4W + Gnd, Wye
3ph, 4W + Gnd, Wye
3ph, 3W + Gnd, Delta
3ph, 4W + Gnd (DCT) hi-leg
3ph, 4W + Gnd, Wye
3ph, 3W + Gnd
Wiring Figure
1
2
2
2
4
3
2
4
3. Mounting.
For best performance, mount the protector as close to service panel as possible. Secure unit
to mounting surface. Use proper fasteners as indicated. (Fasteners not supplied)
2. Disconnect Power Before Installation.
All wiring to be done in accordance with National Electric Code and local codes by
Important Warranty Information
208VAC, wye. Installation of the surge protector improperly on a power system will automatically void
the warranty.

Sentinel Power Inc. •922 Middletown Rd, New Stanton, PA 15672 •E-Mail: [e-mail] •Tel.[phone] •Fax[phone]
Page 2 of 4
4. Wire To Service Panel.
For best performance, conductors should be tightly taped togther and as short as possible for the
entire run.
Circuit Breakers: A circuit breaker should be coordinated to protector wire size. The primary func-
tion of this breaker is to provide a means of removing power from the unit for maintenance. The
circuit breakers will not trip during normal surge suppression since the response time of the circuit
breaker is much longer than the duration of a transient voltage.
These protectors are suitable for use on a circuit capable of delivering not more than 100,000 rms
symmetrical Amperes.*
Use 30A rms circuit breaker (UL489 Listed)
Recheck wiring prior to reapplying power.
This device features and internal protection that will disconnect the surge protective component at
the end of its useful life but will maintain power to the load - now unprotected. If this situation is
undesirable for the application, follow the manufacturers instructions for replacing the device.
WARNING - Risk of Electric Shock:
Disconnect Power before servicing
*Note: "-240D" & "-480D" models- 5,000 rms symmetrical Amperes.
Cet appareil dispose d'une protection interne qui déconnectera l’élément de protection contre les
surtensions à la fin de sa vie utile, mais maintiendra l'alimentation à la charge - sans protection. Si
cette situation n'est pas souhaitable pour l'application, suivre les indications du fabricant pour
remplacer cet appareil.
AVERTISSEMENT - Risque de Choc Électrique:
Coupez l'Alimentation Électrique avant de faire l'entretien. L’entretien doit être effectué unique-
ment par un personnel qualifié.

Sentinel Power Inc. •922 Middletown Rd, New Stanton, PA 15672 •E-Mail: [e-mail] •Tel. [phone] •Fax [phone]
Page 3 of 4
5. Diagnostics & Troubleshooting.
When the red “Protection Reduced” light is illuminated:
• Open door. Caution: High voltage present - Do not touch anything inside.
• Locate red lights indicating module(s) and fuses needing to be replaced.
• Remove AC power. Front panel lights will extinguish. For non-Delta models,
remove thumb screws and pull on handle to remove disconnect.
• Replace appropriate modules and fuses. For non-Delta models, insert disconnect
switch and reinstall thumbscrews.
• Close and secure door. Reapply power.
• Green light on, red light off, full protection restored.
Consult factory for assistance: 1-800-851-1508
Audible Alarm
Audible Alarm is factory preset in the audible position. To disable alarm, move SW1 located on the
front panel board. from “Audible” position to “Mute”.
Counter Reset
To reset counter to 0 count, press SW2 switch marked “Reset” located on the front panel board.
Interior View: Models T, Y, DCT Interior View: Delta Models
Remote
Alarm
Connector
N-G Pro-
tection
Module
Red
LEDs
Fuses Protection
Modules
Remote
Alarm
Connector
Red
LEDs
Fuses Protection
Modules
• Ouvrir la porte. Attention: Présence de courant à haute tension - Ne rien toucher à l'intérieur.

Sentinel Power Inc. •922 Middletown Rd, New Stanton, PA 15672 •E-Mail: [e-mail] •Tel. [phone] •Fax [phone]
Page 4 of 4
6. Remote Alarm Wiring Option
When desired, a 3-wire remote monitoring cable can be can be connected to the remote
alarm relay connector located within the enclosure. The relay deactivates when any section
of the surge suppression modules requires replacement or when power is removed from the
suppressor. This can also be used as a power failure alarm.
Do not exceed alarm relay contact ratings:
Maximum load 90mA.
Class 2 Wiring Only. 14-22 AWG.
Recommended screw torque: 7 in-lbs.
7. Mounting Dimensions
Ne pas dépasser les cotes d’alarme du contact relais: Charge maximale de 90mA.
Câblage de Classe 2 seulement. 14-22 AWG. Couple de serrage recommandé: 0,8 J (7 in-lb)